Implemented getSensors

Changed to Adafruit PWM Servo library for PCA9685
Finalized PCB design for manufacturing

.gitignore

@@ -3,4 +3,7 @@
 bin
 *.sublime-workspace
 node_modules
-src/secret.h
+src/secret.h
+/kicad/Stairs.kicad_pcb-bak
+/kicad/Stairs.bak
+kicad/output/*

kicad/Stairs-cache.lib

@@ -0,0 +1,422 @@
+EESchema-LIBRARY Version 2.4
+#encoding utf-8
+#
+# AMS1117-5.0_AMS1117-5.0
+#
+DEF AMS1117-5.0_AMS1117-5.0 U 0 40 Y Y 1 L N
+F0 "U" -400 220 50 H V L BNN
+F1 "AMS1117-5.0_AMS1117-5.0" -401 -321 50 H V L BNN
+F2 "SOT229P700X180-4N" 0 0 50 H I L BNN
+F3 "Sot223/Pkg 1-Amp 5-Volt Low Drop Out Voltage Regulatator" 0 0 50 H I L BNN
+F4 "Unavailable" 0 0 50 H I L BNN
+F5 "Advanced Monolithic Systems" 0 0 50 H I L BNN
+F6 "None" 0 0 50 H I L BNN
+F7 "None" 0 0 50 H I L BNN
+F8 "AMS1117-5.0" 0 0 50 H I L BNN
+DRAW
+S -400 200 400 -200 0 1 0 f
+X ADJ/GND 1 600 -100 200 L 40 40 0 0 W
+X VOUT 2 600 100 200 L 40 40 0 0 O
+X VIN 3 -600 100 200 R 40 40 0 0 I
+ENDDRAW
+ENDDEF
+#
+# Connector_Generic_Conn_01x02
+#
+DEF Connector_Generic_Conn_01x02 J 0 40 Y N 1 F N
+F0 "J" 0 100 50 H V C CNN
+F1 "Connector_Generic_Conn_01x02" 0 -200 50 H V C CNN
+F2 "" 0 0 50 H I C CNN
+F3 "" 0 0 50 H I C CNN
+$FPLIST
+ Connector*:*_1x??_*
+$ENDFPLIST
+DRAW
+S -50 -95 0 -105 1 1 6 N
+S -50 5 0 -5 1 1 6 N
+S -50 50 50 -150 1 1 10 f
+X Pin_1 1 -200 0 150 R 50 50 1 1 P
+X Pin_2 2 -200 -100 150 R 50 50 1 1 P
+ENDDRAW
+ENDDEF
+#
+# Connector_Generic_Conn_01x04
+#
+DEF Connector_Generic_Conn_01x04 J 0 40 Y N 1 F N
+F0 "J" 0 200 50 H V C CNN
+F1 "Connector_Generic_Conn_01x04" 0 -300 50 H V C CNN
+F2 "" 0 0 50 H I C CNN
+F3 "" 0 0 50 H I C CNN
+$FPLIST
+ Connector*:*_1x??_*
+$ENDFPLIST
+DRAW
+S -50 -195 0 -205 1 1 6 N
+S -50 -95 0 -105 1 1 6 N
+S -50 5 0 -5 1 1 6 N
+S -50 105 0 95 1 1 6 N
+S -50 150 50 -250 1 1 10 f
+X Pin_1 1 -200 100 150 R 50 50 1 1 P
+X Pin_2 2 -200 0 150 R 50 50 1 1 P
+X Pin_3 3 -200 -100 150 R 50 50 1 1 P
+X Pin_4 4 -200 -200 150 R 50 50 1 1 P
+ENDDRAW
+ENDDEF
+#
+# Connector_Generic_Conn_01x06
+#
+DEF Connector_Generic_Conn_01x06 J 0 40 Y N 1 F N
+F0 "J" 0 300 50 H V C CNN
+F1 "Connector_Generic_Conn_01x06" 0 -400 50 H V C CNN
+F2 "" 0 0 50 H I C CNN
+F3 "" 0 0 50 H I C CNN
+$FPLIST
+ Connector*:*_1x??_*
+$ENDFPLIST
+DRAW
+S -50 -295 0 -305 1 1 6 N
+S -50 -195 0 -205 1 1 6 N
+S -50 -95 0 -105 1 1 6 N
+S -50 5 0 -5 1 1 6 N
+S -50 105 0 95 1 1 6 N
+S -50 205 0 195 1 1 6 N
+S -50 250 50 -350 1 1 10 f
+X Pin_1 1 -200 200 150 R 50 50 1 1 P
+X Pin_2 2 -200 100 150 R 50 50 1 1 P
+X Pin_3 3 -200 0 150 R 50 50 1 1 P
+X Pin_4 4 -200 -100 150 R 50 50 1 1 P
+X Pin_5 5 -200 -200 150 R 50 50 1 1 P
+X Pin_6 6 -200 -300 150 R 50 50 1 1 P
+ENDDRAW
+ENDDEF
+#
+# Connector_Generic_Conn_02x03_Odd_Even
+#
+DEF Connector_Generic_Conn_02x03_Odd_Even J 0 40 Y N 1 F N
+F0 "J" 50 200 50 H V C CNN
+F1 "Connector_Generic_Conn_02x03_Odd_Even" 50 -200 50 H V C CNN
+F2 "" 0 0 50 H I C CNN
+F3 "" 0 0 50 H I C CNN
+$FPLIST
+ Connector*:*_2x??_*
+$ENDFPLIST
+DRAW
+S -50 -95 0 -105 1 1 6 N
+S -50 5 0 -5 1 1 6 N
+S -50 105 0 95 1 1 6 N
+S -50 150 150 -150 1 1 10 f
+S 150 -95 100 -105 1 1 6 N
+S 150 5 100 -5 1 1 6 N
+S 150 105 100 95 1 1 6 N
+X Pin_1 1 -200 100 150 R 50 50 1 1 P
+X Pin_2 2 300 100 150 L 50 50 1 1 P
+X Pin_3 3 -200 0 150 R 50 50 1 1 P
+X Pin_4 4 300 0 150 L 50 50 1 1 P
+X Pin_5 5 -200 -100 150 R 50 50 1 1 P
+X Pin_6 6 300 -100 150 L 50 50 1 1 P
+ENDDRAW
+ENDDEF
+#
+# Device_C
+#
+DEF Device_C C 0 10 N Y 1 F N
+F0 "C" 25 100 50 H V L CNN
+F1 "Device_C" 25 -100 50 H V L CNN
+F2 "" 38 -150 50 H I C CNN
+F3 "" 0 0 50 H I C CNN
+$FPLIST
+ C_*
+$ENDFPLIST
+DRAW
+P 2 0 1 20 -80 -30 80 -30 N
+P 2 0 1 20 -80 30 80 30 N
+X ~ 1 0 150 110 D 50 50 1 1 P
+X ~ 2 0 -150 110 U 50 50 1 1 P
+ENDDRAW
+ENDDEF
+#
+# Device_Crystal_Small
+#
+DEF Device_Crystal_Small Y 0 40 N N 1 F N
+F0 "Y" 0 100 50 H V C CNN
+F1 "Device_Crystal_Small" 0 -100 50 H V C CNN
+F2 "" 0 0 50 H I C CNN
+F3 "" 0 0 50 H I C CNN
+$FPLIST
+ Crystal*
+$ENDFPLIST
+DRAW
+S -30 -60 30 60 0 1 0 N
+P 2 0 1 15 -50 -30 -50 30 N
+P 2 0 1 15 50 -30 50 30 N
+X 1 1 -100 0 50 R 50 50 1 1 P
+X 2 2 100 0 50 L 50 50 1 1 P
+ENDDRAW
+ENDDEF
+#
+# Device_LED
+#
+DEF Device_LED D 0 40 N N 1 F N
+F0 "D" 0 100 50 H V C CNN
+F1 "Device_LED" 0 -100 50 H V C CNN
+F2 "" 0 0 50 H I C CNN
+F3 "" 0 0 50 H I C CNN
+$FPLIST
+ LED*
+ LED_SMD:*
+ LED_THT:*
+$ENDFPLIST
+DRAW
+P 2 0 1 8 -50 -50 -50 50 N
+P 2 0 1 0 -50 0 50 0 N
+P 4 0 1 8 50 -50 50 50 -50 0 50 -50 N
+P 5 0 1 0 -120 -30 -180 -90 -150 -90 -180 -90 -180 -60 N
+P 5 0 1 0 -70 -30 -130 -90 -100 -90 -130 -90 -130 -60 N
+X K 1 -150 0 100 R 50 50 1 1 P
+X A 2 150 0 100 L 50 50 1 1 P
+ENDDRAW
+ENDDEF
+#
+# Device_R
+#
+DEF Device_R R 0 0 N Y 1 F N
+F0 "R" 80 0 50 V V C CNN
+F1 "Device_R" 0 0 50 V V C CNN
+F2 "" -70 0 50 V I C CNN
+F3 "" 0 0 50 H I C CNN
+$FPLIST
+ R_*
+$ENDFPLIST
+DRAW
+S -40 -100 40 100 0 1 10 N
+X ~ 1 0 150 50 D 50 50 1 1 P
+X ~ 2 0 -150 50 U 50 50 1 1 P
+ENDDRAW
+ENDDEF
+#
+# MAX485_MAX485
+#
+DEF MAX485_MAX485 U 0 40 Y Y 1 L N
+F0 "U" -401 301 50 H V L BNN
+F1 "MAX485_MAX485" -401 -301 50 H V L BNN
+F2 "" 0 0 50 H I C CNN
+F3 "Maxim Integrated" 0 0 50 H I L BNN
+F4 "None" 0 0 50 H I L BNN
+F5 "Unavailable" 0 0 50 H I L BNN
+F6 "None" 0 0 50 H I L BNN
+F7 "MAX485" 0 0 50 H I L BNN
+$FPLIST
+ DIL08
+ SO08
+$ENDFPLIST
+DRAW
+S -400 300 400 -200 0 1 0 f
+X RO 1 -600 200 200 R 40 40 0 0 B
+X RE 2 -600 100 200 R 40 40 0 0 B I
+X DE 3 -600 0 200 R 40 40 0 0 B
+X DI 4 -600 -100 200 R 40 40 0 0 B
+X GND 5 600 -100 200 L 40 40 0 0 W
+X A 6 600 0 200 L 40 40 0 0 B
+X B 7 600 100 200 L 40 40 0 0 B
+X VCC 8 600 200 200 L 40 40 0 0 W
+ENDDRAW
+ENDDEF
+#
+# MCU_Microchip_ATmega_ATmega328-AU
+#
+DEF MCU_Microchip_ATmega_ATmega328-AU U 0 20 Y Y 1 F N
+F0 "U" -500 1450 50 H V L BNN
+F1 "MCU_Microchip_ATmega_ATmega328-AU" 100 -1450 50 H V L TNN
+F2 "Package_QFP:TQFP-32_7x7mm_P0.8mm" 0 0 50 H I C CIN
+F3 "" 0 0 50 H I C CNN
+ALIAS ATmega48PA-AU ATmega88A-AU ATmega88PA-AU ATmega168A-AU ATmega168PA-AU ATmega328-AU ATmega328P-AU
+$FPLIST
+ TQFP*7x7mm*P0.8mm*
+$ENDFPLIST
+DRAW
+S -500 -1400 500 1400 0 1 10 f
+X PD3 1 600 -800 100 L 50 50 1 1 T
+X PD6 10 600 -1100 100 L 50 50 1 1 T
+X PD7 11 600 -1200 100 L 50 50 1 1 T
+X PB0 12 600 1200 100 L 50 50 1 1 T
+X PB1 13 600 1100 100 L 50 50 1 1 T
+X PB2 14 600 1000 100 L 50 50 1 1 T
+X PB3 15 600 900 100 L 50 50 1 1 T
+X PB4 16 600 800 100 L 50 50 1 1 T
+X PB5 17 600 700 100 L 50 50 1 1 T
+X AVCC 18 100 1500 100 D 50 50 1 1 W
+X ADC6 19 -600 1000 100 R 50 50 1 1 I
+X PD4 2 600 -900 100 L 50 50 1 1 T
+X AREF 20 -600 1200 100 R 50 50 1 1 P
+X GND 21 0 -1500 100 U 50 50 1 1 P N
+X ADC7 22 -600 900 100 R 50 50 1 1 I
+X PC0 23 600 300 100 L 50 50 1 1 T
+X PC1 24 600 200 100 L 50 50 1 1 T
+X PC2 25 600 100 100 L 50 50 1 1 T
+X PC3 26 600 0 100 L 50 50 1 1 T
+X PC4 27 600 -100 100 L 50 50 1 1 T
+X PC5 28 600 -200 100 L 50 50 1 1 T
+X ~RESET~/PC6 29 600 -300 100 L 50 50 1 1 T
+X GND 3 0 -1500 100 U 50 50 1 1 W
+X PD0 30 600 -500 100 L 50 50 1 1 T
+X PD1 31 600 -600 100 L 50 50 1 1 T
+X PD2 32 600 -700 100 L 50 50 1 1 T
+X VCC 4 0 1500 100 D 50 50 1 1 W
+X GND 5 0 -1500 100 U 50 50 1 1 P N
+X VCC 6 0 1500 100 D 50 50 1 1 P N
+X XTAL1/PB6 7 600 600 100 L 50 50 1 1 T
+X XTAL2/PB7 8 600 500 100 L 50 50 1 1 T
+X PD5 9 600 -1000 100 L 50 50 1 1 T
+ENDDRAW
+ENDDEF
+#
+# PCA9685-TSSOP_PCA9685-TSSOP
+#
+DEF PCA9685-TSSOP_PCA9685-TSSOP U 0 40 Y Y 1 F N
+F0 "U" 0 -100 50 H V C CNN
+F1 "PCA9685-TSSOP_PCA9685-TSSOP" 0 100 50 H V C CNN
+F2 "MODULE" 0 0 50 H I C CNN
+F3 "DOCUMENTATION" 0 0 50 H I C CNN
+DRAW
+S -450 -850 450 850 1 0 0 f
+X A0 1 -750 650 300 R 50 50 1 1 I
+X LED4 10 -750 -250 300 R 50 50 1 1 O
+X LED5 11 -750 -350 300 R 50 50 1 1 O
+X LED6 12 -750 -450 300 R 50 50 1 1 O
+X LED7 13 -750 -550 300 R 50 50 1 1 O
+X GND 14 -750 -650 300 R 50 50 1 1 I
+X LED8 15 750 -650 300 L 50 50 1 1 O
+X LED9 16 750 -550 300 L 50 50 1 1 O
+X LED10 17 750 -450 300 L 50 50 1 1 O
+X LED11 18 750 -350 300 L 50 50 1 1 O
+X LED12 19 750 -250 300 L 50 50 1 1 O
+X A1 2 -750 550 300 R 50 50 1 1 I
+X LED13 20 750 -150 300 L 50 50 1 1 O
+X LED14 21 750 -50 300 L 50 50 1 1 O
+X LED15 22 750 50 300 L 50 50 1 1 O
+X OE 23 750 150 300 L 50 50 1 1 I
+X A5 24 750 250 300 L 50 50 1 1 I
+X EXTCLK 25 750 350 300 L 50 50 1 1 I
+X SCL 26 750 450 300 L 50 50 1 1 I
+X SDA 27 750 550 300 L 50 50 1 1 B
+X VCC 28 750 650 300 L 50 50 1 1 I
+X A2 3 -750 450 300 R 50 50 1 1 I
+X A3 4 -750 350 300 R 50 50 1 1 I
+X A4 5 -750 250 300 R 50 50 1 1 I
+X LED0 6 -750 150 300 R 50 50 1 1 O
+X LED1 7 -750 50 300 R 50 50 1 1 O
+X LED2 8 -750 -50 300 R 50 50 1 1 O
+X LED3 9 -750 -150 300 R 50 50 1 1 O
+ENDDRAW
+ENDDEF
+#
+# Switch_SW_Push
+#
+DEF Switch_SW_Push SW 0 40 N N 1 F N
+F0 "SW" 50 100 50 H V L CNN
+F1 "Switch_SW_Push" 0 -60 50 H V C CNN
+F2 "" 0 200 50 H I C CNN
+F3 "" 0 200 50 H I C CNN
+DRAW
+C -80 0 20 0 1 0 N
+C 80 0 20 0 1 0 N
+P 2 0 1 0 0 50 0 120 N
+P 2 0 1 0 100 50 -100 50 N
+X 1 1 -200 0 100 R 50 50 0 1 P
+X 2 2 200 0 100 L 50 50 0 1 P
+ENDDRAW
+ENDDEF
+#
+# Transistor_FET_IRLB8721PBF
+#
+DEF Transistor_FET_IRLB8721PBF Q 0 0 Y N 1 F N
+F0 "Q" 250 75 50 H V L CNN
+F1 "Transistor_FET_IRLB8721PBF" 250 0 50 H V L CNN
+F2 "Package_TO_SOT_THT:TO-220-3_Vertical" 250 -75 50 H I L CIN
+F3 "" 0 0 50 H I L CNN
+ALIAS IRF3205 IRF540N IRF740 IRLB8721PBF IRLZ34N IRLZ44N
+$FPLIST
+ TO?220*
+$ENDFPLIST
+DRAW
+C 65 0 111 0 1 10 N
+C 100 -70 11 0 1 0 F
+C 100 70 11 0 1 0 F
+P 2 0 1 0 10 0 -100 0 N
+P 2 0 1 0 30 -70 100 -70 N
+P 2 0 1 10 30 -50 30 -90 N
+P 2 0 1 0 30 0 100 0 N
+P 2 0 1 10 30 20 30 -20 N
+P 2 0 1 0 30 70 100 70 N
+P 2 0 1 10 30 90 30 50 N
+P 2 0 1 0 100 -70 100 -100 N
+P 2 0 1 0 100 -70 100 0 N
+P 2 0 1 0 100 100 100 70 N
+P 3 0 1 10 10 75 10 -75 10 -75 N
+P 4 0 1 0 40 0 80 15 80 -15 40 0 F
+P 4 0 1 0 100 -70 130 -70 130 70 100 70 N
+P 4 0 1 0 110 20 115 15 145 15 150 10 N
+P 4 0 1 0 130 15 115 -10 145 -10 130 15 N
+X G 1 -200 0 100 R 50 50 1 1 I
+X D 2 100 200 100 D 50 50 1 1 P
+X S 3 100 -200 100 U 50 50 1 1 P
+ENDDRAW
+ENDDEF
+#
+# power_+12V
+#
+DEF power_+12V #PWR 0 0 Y Y 1 F P
+F0 "#PWR" 0 -150 50 H I C CNN
+F1 "power_+12V" 0 140 50 H V C CNN
+F2 "" 0 0 50 H I C CNN
+F3 "" 0 0 50 H I C CNN
+DRAW
+P 2 0 1 0 -30 50 0 100 N
+P 2 0 1 0 0 0 0 100 N
+P 2 0 1 0 0 100 30 50 N
+X +12V 1 0 0 0 U 50 50 1 1 W N
+ENDDRAW
+ENDDEF
+#
+# power_+5V
+#
+DEF power_+5V #PWR 0 0 Y Y 1 F P
+F0 "#PWR" 0 -150 50 H I C CNN
+F1 "power_+5V" 0 140 50 H V C CNN
+F2 "" 0 0 50 H I C CNN
+F3 "" 0 0 50 H I C CNN
+DRAW
+P 2 0 1 0 -30 50 0 100 N
+P 2 0 1 0 0 0 0 100 N
+P 2 0 1 0 0 100 30 50 N
+X +5V 1 0 0 0 U 50 50 1 1 W N
+ENDDRAW
+ENDDEF
+#
+# power_GND
+#
+DEF power_GND #PWR 0 0 Y Y 1 F P
+F0 "#PWR" 0 -250 50 H I C CNN
+F1 "power_GND" 0 -150 50 H V C CNN
+F2 "" 0 0 50 H I C CNN
+F3 "" 0 0 50 H I C CNN
+DRAW
+P 6 0 1 0 0 0 0 -50 50 -50 0 -100 -50 -50 0 -50 N
+X GND 1 0 0 0 D 50 50 1 1 W N
+ENDDRAW
+ENDDEF
+#
+# power_PWR_FLAG
+#
+DEF power_PWR_FLAG #FLG 0 0 N N 1 F P
+F0 "#FLG" 0 75 50 H I C CNN
+F1 "power_PWR_FLAG" 0 150 50 H V C CNN
+F2 "" 0 0 50 H I C CNN
+F3 "" 0 0 50 H I C CNN
+DRAW
+P 6 0 1 0 0 0 0 50 -40 75 0 100 40 75 0 50 N
+X pwr 1 0 0 0 U 50 50 0 0 w
+ENDDRAW
+ENDDEF
+#
+#End Library

kicad/Stairs.net

@@ -0,0 +1,665 @@
+(export (version D)
+  (design
+    (source P:\Electronics\Stairs\kicad\Stairs.sch)
+    (date "25-11-2018 22:16:46")
+    (tool "Eeschema (5.0.1)-3")
+    (sheet (number 1) (name /) (tstamps /)
+      (title_block
+        (title "Stairs submodule")
+        (company "Mark van Renswoude")
+        (rev 1)
+        (date 2018-09-02)
+        (source Stairs.sch)
+        (comment (number 1) (value ""))
+        (comment (number 2) (value ""))
+        (comment (number 3) (value ""))
+        (comment (number 4) (value "")))))
+  (components
+    (comp (ref PCA9685)
+      (value PCA9685-TSSOP)
+      (footprint Housings_SSOP:TSSOP-28_4.4x9.7mm_Pitch0.65mm)
+      (datasheet DOCUMENTATION)
+      (libsource (lib PCA9685-TSSOP) (part PCA9685-TSSOP) (description ""))
+      (sheetpath (names /) (tstamps /))
+      (tstamp 5B8AD5C2))
+    (comp (ref U2)
+      (value MAX485)
+      (footprint MAX485-SO8:SO-8)
+      (datasheet "Maxim Integrated")
+      (fields
+        (field (name Field4) None)
+        (field (name Field5) Unavailable)
+        (field (name Field6) None)
+        (field (name Field7) MAX485))
+      (libsource (lib MAX485) (part MAX485) (description ""))
+      (sheetpath (names /) (tstamps /))
+      (tstamp 5B8AD72A))
+    (comp (ref P6)
+      (value PWR_IN)
+      (footprint Terminal_Blocks:TerminalBlock_bornier-2_P5.08mm)
+      (libsource (lib Connector_Generic) (part Conn_01x02) (description "Generic connector, single row, 01x02, script generated (kicad-library-utils/schlib/autogen/connector/)"))
+      (sheetpath (names /) (tstamps /))
+      (tstamp 5B8AD8CA))
+    (comp (ref P5)
+      (value PWR_OUT)
+      (footprint Terminal_Blocks:TerminalBlock_bornier-2_P5.08mm)
+      (libsource (lib Connector_Generic) (part Conn_01x02) (description "Generic connector, single row, 01x02, script generated (kicad-library-utils/schlib/autogen/connector/)"))
+      (sheetpath (names /) (tstamps /))
+      (tstamp 5B8ADA74))
+    (comp (ref P3)
+      (value SENSOR)
+      (footprint Terminal_Blocks:TerminalBlock_bornier-6_P5.08mm)
+      (libsource (lib Connector_Generic) (part Conn_01x06) (description "Generic connector, single row, 01x06, script generated (kicad-library-utils/schlib/autogen/connector/)"))
+      (sheetpath (names /) (tstamps /))
+      (tstamp 5B8AE6A5))
+    (comp (ref P1)
+      (value DATA_IN)
+      (footprint Terminal_Blocks:TerminalBlock_bornier-2_P5.08mm)
+      (libsource (lib Connector_Generic) (part Conn_01x02) (description "Generic connector, single row, 01x02, script generated (kicad-library-utils/schlib/autogen/connector/)"))
+      (sheetpath (names /) (tstamps /))
+      (tstamp 5B8AE987))
+    (comp (ref P2)
+      (value DATA_OUT)
+      (footprint Terminal_Blocks:TerminalBlock_bornier-2_P5.08mm)
+      (libsource (lib Connector_Generic) (part Conn_01x02) (description "Generic connector, single row, 01x02, script generated (kicad-library-utils/schlib/autogen/connector/)"))
+      (sheetpath (names /) (tstamps /))
+      (tstamp 5B8AE9DD))
+    (comp (ref AMS1117)
+      (value AMS1117-5)
+      (footprint AMS1117-5.0:SOT229P700X180-4N)
+      (datasheet AMS1117-5.0)
+      (fields
+        (field (name Field4) None)
+        (field (name Field5) Unavailable)
+        (field (name Field6) "Sot223/Pkg 1-Amp 3.3-Volt Low Drop Out Voltage Regulatator")
+        (field (name Field7) "Advanced Monolithic Systems")
+        (field (name Field8) None))
+      (libsource (lib AMS1117-5.0) (part AMS1117-5.0) (description ""))
+      (sheetpath (names /) (tstamps /))
+      (tstamp 5B8AFB24))
+    (comp (ref C3)
+      (value 10µF)
+      (footprint Capacitors_Tantalum_SMD:CP_Tantalum_Case-D_EIA-7343-31_Reflow)
+      (libsource (lib Device) (part C) (description "Unpolarized capacitor"))
+      (sheetpath (names /) (tstamps /))
+      (tstamp 5B8B090B))
+    (comp (ref C4)
+      (value 100nF)
+      (footprint Capacitors_SMD:C_1206)
+      (libsource (lib Device) (part C) (description "Unpolarized capacitor"))
+      (sheetpath (names /) (tstamps /))
+      (tstamp 5B8B1267))
+    (comp (ref C2)
+      (value 33pF)
+      (footprint Capacitors_SMD:C_1206)
+      (libsource (lib Device) (part C) (description "Unpolarized capacitor"))
+      (sheetpath (names /) (tstamps /))
+      (tstamp 5B8B93C9))
+    (comp (ref C1)
+      (value 33pF)
+      (footprint Capacitors_SMD:C_1206)
+      (libsource (lib Device) (part C) (description "Unpolarized capacitor"))
+      (sheetpath (names /) (tstamps /))
+      (tstamp 5B8B9824))
+    (comp (ref XTAL1)
+      (value "16 Mhz")
+      (footprint Crystals:Crystal_HC49-U_Vertical)
+      (libsource (lib Device) (part Crystal_Small) (description "Two pin crystal, small symbol"))
+      (sheetpath (names /) (tstamps /))
+      (tstamp 5B8B9A62))
+    (comp (ref R1)
+      (value 4.7K)
+      (footprint Resistors_SMD:R_0603)
+      (libsource (lib Device) (part R) (description Resistor))
+      (sheetpath (names /) (tstamps /))
+      (tstamp 5B8C2380))
+    (comp (ref P7)
+      (value SSD1306)
+      (footprint Pin_Headers:Pin_Header_Straight_1x04_Pitch2.54mm)
+      (libsource (lib Connector_Generic) (part Conn_01x04) (description "Generic connector, single row, 01x04, script generated (kicad-library-utils/schlib/autogen/connector/)"))
+      (sheetpath (names /) (tstamps /))
+      (tstamp 5B8C32B0))
+    (comp (ref Q1)
+      (value IRLB8721PBF)
+      (footprint TO_SOT_Packages_THT:TO-220-3_Vertical)
+      (libsource (lib Transistor_FET) (part IRLB8721PBF) (description "62A Id, 30V Vds, N-Channel MOSFET, TO-220"))
+      (sheetpath (names /) (tstamps /))
+      (tstamp 5B8C8EA8))
+    (comp (ref R2)
+      (value 150)
+      (footprint Resistors_SMD:R_0603)
+      (libsource (lib Device) (part R) (description Resistor))
+      (sheetpath (names /) (tstamps /))
+      (tstamp 5B8CAD1E))
+    (comp (ref R3)
+      (value 150)
+      (footprint Resistors_SMD:R_0603)
+      (libsource (lib Device) (part R) (description Resistor))
+      (sheetpath (names /) (tstamps /))
+      (tstamp 5B8CAE68))
+    (comp (ref Q2)
+      (value IRLB8721PBF)
+      (footprint TO_SOT_Packages_THT:TO-220-3_Vertical)
+      (libsource (lib Transistor_FET) (part IRLB8721PBF) (description "62A Id, 30V Vds, N-Channel MOSFET, TO-220"))
+      (sheetpath (names /) (tstamps /))
+      (tstamp 5B8CB00E))
+    (comp (ref P4)
+      (value LED)
+      (footprint Terminal_Blocks:TerminalBlock_bornier-4_P5.08mm)
+      (libsource (lib Connector_Generic) (part Conn_01x04) (description "Generic connector, single row, 01x04, script generated (kicad-library-utils/schlib/autogen/connector/)"))
+      (sheetpath (names /) (tstamps /))
+      (tstamp 5B8CBF27))
+    (comp (ref R4)
+      (value 10K)
+      (footprint Resistors_SMD:R_0603)
+      (libsource (lib Device) (part R) (description Resistor))
+      (sheetpath (names /) (tstamps /))
+      (tstamp 5B8C6BF9))
+    (comp (ref R5)
+      (value 10K)
+      (footprint Resistors_SMD:R_0603)
+      (libsource (lib Device) (part R) (description Resistor))
+      (sheetpath (names /) (tstamps /))
+      (tstamp 5B925FBE))
+    (comp (ref J1)
+      (value PROG)
+      (footprint Pin_Headers:Pin_Header_Straight_2x03_Pitch2.54mm)
+      (datasheet ~)
+      (libsource (lib Connector_Generic) (part Conn_02x03_Odd_Even) (description "Generic connector, double row, 02x03, odd/even pin numbering scheme (row 1 odd numbers, row 2 even numbers), script generated (kicad-library-utils/schlib/autogen/connector/)"))
+      (sheetpath (names /) (tstamps /))
+      (tstamp 5BEBD38C))
+    (comp (ref SW1)
+      (value Button)
+      (footprint SMD-BUTTON_4P-5.2X5.2X1.5MM-SKQGAKE010_:SW4-SMD-5.2X5.2X1.5MM)
+      (libsource (lib Switch) (part SW_Push) (description "Push button switch, generic, two pins"))
+      (sheetpath (names /) (tstamps /))
+      (tstamp 5BF329CF))
+    (comp (ref U1)
+      (value ATmega328-AU)
+      (footprint Housings_QFP:TQFP-32_7x7mm_Pitch0.8mm)
+      (datasheet http://ww1.microchip.com/downloads/en/DeviceDoc/ATmega328_P%20AVR%20MCU%20with%20picoPower%20Technology%20Data%20Sheet%2040001984A.pdf)
+      (libsource (lib MCU_Microchip_ATmega) (part ATmega328-AU) (description "20MHz, 32kB Flash, 2kB SRAM, 1kB EEPROM, TQFP-32"))
+      (sheetpath (names /) (tstamps /))
+      (tstamp 5BF96964))
+    (comp (ref R6)
+      (value 4.7K)
+      (footprint Resistors_SMD:R_0603)
+      (libsource (lib Device) (part R) (description Resistor))
+      (sheetpath (names /) (tstamps /))
+      (tstamp 5C0CFA3C))
+    (comp (ref C5)
+      (value 100nF)
+      (footprint Capacitors_SMD:C_1206)
+      (libsource (lib Device) (part C) (description "Unpolarized capacitor"))
+      (sheetpath (names /) (tstamps /))
+      (tstamp 5C0DFCEB))
+    (comp (ref D1)
+      (value LED)
+      (footprint LEDs:LED_D5.0mm)
+      (datasheet ~)
+      (libsource (lib Device) (part LED) (description "Light emitting diode"))
+      (sheetpath (names /) (tstamps /))
+      (tstamp 5BFAB89C))
+    (comp (ref D2)
+      (value LED)
+      (footprint LEDs:LED_D5.0mm)
+      (datasheet ~)
+      (libsource (lib Device) (part LED) (description "Light emitting diode"))
+      (sheetpath (names /) (tstamps /))
+      (tstamp 5BFABDA6)))
+  (libparts
+    (libpart (lib AMS1117-5.0) (part AMS1117-5.0)
+      (fields
+        (field (name Reference) U)
+        (field (name Value) AMS1117-5.0)
+        (field (name Footprint) SOT229P700X180-4N)
+        (field (name Datasheet) "Sot223/Pkg 1-Amp 5-Volt Low Drop Out Voltage Regulatator")
+        (field (name Field4) Unavailable)
+        (field (name Field5) "Advanced Monolithic Systems")
+        (field (name Field6) None)
+        (field (name Field7) None)
+        (field (name Field8) AMS1117-5.0))
+      (pins
+        (pin (num 1) (name ADJ/GND) (type power_in))
+        (pin (num 2) (name VOUT) (type output))
+        (pin (num 3) (name VIN) (type input))))
+    (libpart (lib Connector_Generic) (part Conn_01x02)
+      (description "Generic connector, single row, 01x02, script generated (kicad-library-utils/schlib/autogen/connector/)")
+      (docs ~)
+      (footprints
+        (fp Connector*:*_1x??_*))
+      (fields
+        (field (name Reference) J)
+        (field (name Value) Conn_01x02))
+      (pins
+        (pin (num 1) (name Pin_1) (type passive))
+        (pin (num 2) (name Pin_2) (type passive))))
+    (libpart (lib Connector_Generic) (part Conn_01x04)
+      (description "Generic connector, single row, 01x04, script generated (kicad-library-utils/schlib/autogen/connector/)")
+      (docs ~)
+      (footprints
+        (fp Connector*:*_1x??_*))
+      (fields
+        (field (name Reference) J)
+        (field (name Value) Conn_01x04))
+      (pins
+        (pin (num 1) (name Pin_1) (type passive))
+        (pin (num 2) (name Pin_2) (type passive))
+        (pin (num 3) (name Pin_3) (type passive))
+        (pin (num 4) (name Pin_4) (type passive))))
+    (libpart (lib Connector_Generic) (part Conn_01x06)
+      (description "Generic connector, single row, 01x06, script generated (kicad-library-utils/schlib/autogen/connector/)")
+      (docs ~)
+      (footprints
+        (fp Connector*:*_1x??_*))
+      (fields
+        (field (name Reference) J)
+        (field (name Value) Conn_01x06))
+      (pins
+        (pin (num 1) (name Pin_1) (type passive))
+        (pin (num 2) (name Pin_2) (type passive))
+        (pin (num 3) (name Pin_3) (type passive))
+        (pin (num 4) (name Pin_4) (type passive))
+        (pin (num 5) (name Pin_5) (type passive))
+        (pin (num 6) (name Pin_6) (type passive))))
+    (libpart (lib Connector_Generic) (part Conn_02x03_Odd_Even)
+      (description "Generic connector, double row, 02x03, odd/even pin numbering scheme (row 1 odd numbers, row 2 even numbers), script generated (kicad-library-utils/schlib/autogen/connector/)")
+      (docs ~)
+      (footprints
+        (fp Connector*:*_2x??_*))
+      (fields
+        (field (name Reference) J)
+        (field (name Value) Conn_02x03_Odd_Even))
+      (pins
+        (pin (num 1) (name Pin_1) (type passive))
+        (pin (num 2) (name Pin_2) (type passive))
+        (pin (num 3) (name Pin_3) (type passive))
+        (pin (num 4) (name Pin_4) (type passive))
+        (pin (num 5) (name Pin_5) (type passive))
+        (pin (num 6) (name Pin_6) (type passive))))
+    (libpart (lib Device) (part C)
+      (description "Unpolarized capacitor")
+      (docs ~)
+      (footprints
+        (fp C_*))
+      (fields
+        (field (name Reference) C)
+        (field (name Value) C))
+      (pins
+        (pin (num 1) (name ~) (type passive))
+        (pin (num 2) (name ~) (type passive))))
+    (libpart (lib Device) (part Crystal_Small)
+      (description "Two pin crystal, small symbol")
+      (docs ~)
+      (footprints
+        (fp Crystal*))
+      (fields
+        (field (name Reference) Y)
+        (field (name Value) Crystal_Small))
+      (pins
+        (pin (num 1) (name 1) (type passive))
+        (pin (num 2) (name 2) (type passive))))
+    (libpart (lib Device) (part LED)
+      (description "Light emitting diode")
+      (docs ~)
+      (footprints
+        (fp LED*)
+        (fp LED_SMD:*)
+        (fp LED_THT:*))
+      (fields
+        (field (name Reference) D)
+        (field (name Value) LED))
+      (pins
+        (pin (num 1) (name K) (type passive))
+        (pin (num 2) (name A) (type passive))))
+    (libpart (lib Device) (part R)
+      (description Resistor)
+      (docs ~)
+      (footprints
+        (fp R_*))
+      (fields
+        (field (name Reference) R)
+        (field (name Value) R))
+      (pins
+        (pin (num 1) (name ~) (type passive))
+        (pin (num 2) (name ~) (type passive))))
+    (libpart (lib MAX485) (part MAX485)
+      (footprints
+        (fp DIL08)
+        (fp SO08))
+      (fields
+        (field (name Reference) U)
+        (field (name Value) MAX485)
+        (field (name Datasheet) "Maxim Integrated")
+        (field (name Field4) None)
+        (field (name Field5) Unavailable)
+        (field (name Field6) None)
+        (field (name Field7) MAX485))
+      (pins
+        (pin (num 1) (name RO) (type BiDi))
+        (pin (num 2) (name RE) (type BiDi))
+        (pin (num 3) (name DE) (type BiDi))
+        (pin (num 4) (name DI) (type BiDi))
+        (pin (num 5) (name GND) (type power_in))
+        (pin (num 6) (name A) (type BiDi))
+        (pin (num 7) (name B) (type BiDi))
+        (pin (num 8) (name VCC) (type power_in))))
+    (libpart (lib MCU_Microchip_ATmega) (part ATmega48A-AU)
+      (aliases
+        (alias ATmega48PA-AU)
+        (alias ATmega88A-AU)
+        (alias ATmega88PA-AU)
+        (alias ATmega168A-AU)
+        (alias ATmega168PA-AU)
+        (alias ATmega328-AU)
+        (alias ATmega328P-AU))
+      (description "20MHz, 4kB Flash, 512B SRAM, 256B EEPROM, TQFP-32")
+      (docs http://ww1.microchip.com/downloads/en/DeviceDoc/ATmega48A_88A_168A-Data-Sheet-40002007A.pdf)
+      (footprints
+        (fp TQFP*7x7mm*P0.8mm*))
+      (fields
+        (field (name Reference) U)
+        (field (name Value) ATmega48A-AU)
+        (field (name Footprint) Package_QFP:TQFP-32_7x7mm_P0.8mm))
+      (pins
+        (pin (num 1) (name PD3) (type 3state))
+        (pin (num 2) (name PD4) (type 3state))
+        (pin (num 3) (name GND) (type power_in))
+        (pin (num 4) (name VCC) (type power_in))
+        (pin (num 5) (name GND) (type passive))
+        (pin (num 6) (name VCC) (type passive))
+        (pin (num 7) (name XTAL1/PB6) (type 3state))
+        (pin (num 8) (name XTAL2/PB7) (type 3state))
+        (pin (num 9) (name PD5) (type 3state))
+        (pin (num 10) (name PD6) (type 3state))
+        (pin (num 11) (name PD7) (type 3state))
+        (pin (num 12) (name PB0) (type 3state))
+        (pin (num 13) (name PB1) (type 3state))
+        (pin (num 14) (name PB2) (type 3state))
+        (pin (num 15) (name PB3) (type 3state))
+        (pin (num 16) (name PB4) (type 3state))
+        (pin (num 17) (name PB5) (type 3state))
+        (pin (num 18) (name AVCC) (type power_in))
+        (pin (num 19) (name ADC6) (type input))
+        (pin (num 20) (name AREF) (type passive))
+        (pin (num 21) (name GND) (type passive))
+        (pin (num 22) (name ADC7) (type input))
+        (pin (num 23) (name PC0) (type 3state))
+        (pin (num 24) (name PC1) (type 3state))
+        (pin (num 25) (name PC2) (type 3state))
+        (pin (num 26) (name PC3) (type 3state))
+        (pin (num 27) (name PC4) (type 3state))
+        (pin (num 28) (name PC5) (type 3state))
+        (pin (num 29) (name ~RESET~/PC6) (type 3state))
+        (pin (num 30) (name PD0) (type 3state))
+        (pin (num 31) (name PD1) (type 3state))
+        (pin (num 32) (name PD2) (type 3state))))
+    (libpart (lib PCA9685-TSSOP) (part PCA9685-TSSOP)
+      (fields
+        (field (name Reference) U)
+        (field (name Value) PCA9685-TSSOP)
+        (field (name Footprint) MODULE)
+        (field (name Datasheet) DOCUMENTATION))
+      (pins
+        (pin (num 1) (name A0) (type input))
+        (pin (num 2) (name A1) (type input))
+        (pin (num 3) (name A2) (type input))
+        (pin (num 4) (name A3) (type input))
+        (pin (num 5) (name A4) (type input))
+        (pin (num 6) (name LED0) (type output))
+        (pin (num 7) (name LED1) (type output))
+        (pin (num 8) (name LED2) (type output))
+        (pin (num 9) (name LED3) (type output))
+        (pin (num 10) (name LED4) (type output))
+        (pin (num 11) (name LED5) (type output))
+        (pin (num 12) (name LED6) (type output))
+        (pin (num 13) (name LED7) (type output))
+        (pin (num 14) (name GND) (type input))
+        (pin (num 15) (name LED8) (type output))
+        (pin (num 16) (name LED9) (type output))
+        (pin (num 17) (name LED10) (type output))
+        (pin (num 18) (name LED11) (type output))
+        (pin (num 19) (name LED12) (type output))
+        (pin (num 20) (name LED13) (type output))
+        (pin (num 21) (name LED14) (type output))
+        (pin (num 22) (name LED15) (type output))
+        (pin (num 23) (name OE) (type input))
+        (pin (num 24) (name A5) (type input))
+        (pin (num 25) (name EXTCLK) (type input))
+        (pin (num 26) (name SCL) (type input))
+        (pin (num 27) (name SDA) (type BiDi))
+        (pin (num 28) (name VCC) (type input))))
+    (libpart (lib Switch) (part SW_Push)
+      (description "Push button switch, generic, two pins")
+      (fields
+        (field (name Reference) SW)
+        (field (name Value) SW_Push))
+      (pins
+        (pin (num 1) (name 1) (type passive))
+        (pin (num 2) (name 2) (type passive))))
+    (libpart (lib Transistor_FET) (part BUZ11)
+      (aliases
+        (alias IRF3205)
+        (alias IRF540N)
+        (alias IRF740)
+        (alias IRLB8721PBF)
+        (alias IRLZ34N)
+        (alias IRLZ44N))
+      (description "30A Id, 50V Vds, N-Channel Power MOSFET, TO-220")
+      (docs http://www.fairchildsemi.com/ds/BU/BUZ11.pdf)
+      (footprints
+        (fp TO?220*))
+      (fields
+        (field (name Reference) Q)
+        (field (name Value) BUZ11)
+        (field (name Footprint) Package_TO_SOT_THT:TO-220-3_Vertical))
+      (pins
+        (pin (num 1) (name G) (type input))
+        (pin (num 2) (name D) (type passive))
+        (pin (num 3) (name S) (type passive)))))
+  (libraries
+    (library (logical AMS1117-5.0)
+      (uri P:\Electronics\Stairs\kicad/libs/AMS1117-5.0.lib))
+    (library (logical Connector_Generic)
+      (uri "C:\\Program Files\\KiCad\\share\\kicad\\library/Connector_Generic.lib"))
+    (library (logical Device)
+      (uri "C:\\Program Files\\KiCad\\share\\kicad\\library/Device.lib"))
+    (library (logical MAX485)
+      (uri P:\Electronics\Stairs\kicad/libs/MAX485.lib))
+    (library (logical MCU_Microchip_ATmega)
+      (uri "C:\\Program Files\\KiCad\\share\\kicad\\library/MCU_Microchip_ATmega.lib"))
+    (library (logical PCA9685-TSSOP)
+      (uri P:\Electronics\Stairs\kicad/libs/PCA9685-TSSOP.lib))
+    (library (logical Switch)
+      (uri "C:\\Program Files\\KiCad\\share\\kicad\\library/Switch.lib"))
+    (library (logical Transistor_FET)
+      (uri "C:\\Program Files\\KiCad\\share\\kicad\\library/Transistor_FET.lib")))
+  (nets
+    (net (code 1) (name "Net-(Q1-Pad1)")
+      (node (ref R2) (pin 2))
+      (node (ref Q1) (pin 1)))
+    (net (code 2) (name "Net-(P3-Pad3)")
+      (node (ref U1) (pin 24))
+      (node (ref P3) (pin 3)))
+    (net (code 3) (name "Net-(P3-Pad6)")
+      (node (ref P3) (pin 6))
+      (node (ref U1) (pin 25)))
+    (net (code 4) (name GND)
+      (node (ref C5) (pin 2))
+      (node (ref U1) (pin 5))
+      (node (ref C4) (pin 1))
+      (node (ref C3) (pin 1))
+      (node (ref SW1) (pin 2))
+      (node (ref U1) (pin 3))
+      (node (ref D2) (pin 1))
+      (node (ref D1) (pin 1))
+      (node (ref U1) (pin 21))
+      (node (ref P7) (pin 4))
+      (node (ref Q1) (pin 3))
+      (node (ref Q2) (pin 3))
+      (node (ref AMS1117) (pin 1))
+      (node (ref C1) (pin 2))
+      (node (ref C2) (pin 2))
+      (node (ref PCA9685) (pin 14))
+      (node (ref P3) (pin 5))
+      (node (ref P3) (pin 2))
+      (node (ref P5) (pin 2))
+      (node (ref P6) (pin 1))
+      (node (ref U2) (pin 5))
+      (node (ref J1) (pin 6))
+      (node (ref R4) (pin 2)))
+    (net (code 5) (name +5V)
+      (node (ref C3) (pin 2))
+      (node (ref AMS1117) (pin 2))
+      (node (ref J1) (pin 2))
+      (node (ref C4) (pin 2))
+      (node (ref R6) (pin 1))
+      (node (ref U1) (pin 6))
+      (node (ref U1) (pin 4))
+      (node (ref R1) (pin 2))
+      (node (ref P7) (pin 3))
+      (node (ref U2) (pin 8))
+      (node (ref P3) (pin 1))
+      (node (ref P3) (pin 4))
+      (node (ref PCA9685) (pin 28))
+      (node (ref U1) (pin 18))
+      (node (ref R5) (pin 2)))
+    (net (code 6) (name "Net-(SW1-Pad1)")
+      (node (ref SW1) (pin 1))
+      (node (ref U1) (pin 12)))
+    (net (code 7) (name RST)
+      (node (ref U1) (pin 29))
+      (node (ref R5) (pin 1))
+      (node (ref J1) (pin 5)))
+    (net (code 8) (name /PD)
+      (node (ref PCA9685) (pin 2))
+      (node (ref PCA9685) (pin 4))
+      (node (ref R4) (pin 1))
+      (node (ref PCA9685) (pin 23))
+      (node (ref PCA9685) (pin 24))
+      (node (ref PCA9685) (pin 3))
+      (node (ref PCA9685) (pin 5))
+      (node (ref PCA9685) (pin 1)))
+    (net (code 9) (name +12V)
+      (node (ref AMS1117) (pin 3))
+      (node (ref P6) (pin 2))
+      (node (ref P4) (pin 2))
+      (node (ref P4) (pin 4))
+      (node (ref P5) (pin 1)))
+    (net (code 10) (name "Net-(U1-Pad9)")
+      (node (ref U1) (pin 9)))
+    (net (code 11) (name "Net-(U1-Pad2)")
+      (node (ref U1) (pin 2)))
+    (net (code 12) (name "Net-(U1-Pad14)")
+      (node (ref U1) (pin 14)))
+    (net (code 13) (name "Net-(U1-Pad13)")
+      (node (ref U1) (pin 13)))
+    (net (code 14) (name "Net-(D1-Pad2)")
+      (node (ref PCA9685) (pin 8))
+      (node (ref D1) (pin 2)))
+    (net (code 15) (name "Net-(D2-Pad2)")
+      (node (ref D2) (pin 2))
+      (node (ref PCA9685) (pin 9)))
+    (net (code 16) (name "Net-(U1-Pad11)")
+      (node (ref U1) (pin 11)))
+    (net (code 17) (name "Net-(U1-Pad22)")
+      (node (ref U1) (pin 22)))
+    (net (code 18) (name "Net-(U1-Pad19)")
+      (node (ref U1) (pin 19)))
+    (net (code 19) (name "Net-(C5-Pad1)")
+      (node (ref C5) (pin 1))
+      (node (ref U1) (pin 20)))
+    (net (code 20) (name "Net-(C1-Pad1)")
+      (node (ref U1) (pin 7))
+      (node (ref C1) (pin 1))
+      (node (ref XTAL1) (pin 2)))
+    (net (code 21) (name SCL)
+      (node (ref U1) (pin 28))
+      (node (ref R6) (pin 2))
+      (node (ref P7) (pin 2))
+      (node (ref PCA9685) (pin 26)))
+    (net (code 22) (name SDA)
+      (node (ref P7) (pin 1))
+      (node (ref PCA9685) (pin 27))
+      (node (ref U1) (pin 27))
+      (node (ref R1) (pin 1)))
+    (net (code 23) (name "Net-(U1-Pad26)")
+      (node (ref U1) (pin 26)))
+    (net (code 24) (name "Net-(U1-Pad23)")
+      (node (ref U1) (pin 23)))
+    (net (code 25) (name SCK)
+      (node (ref U1) (pin 17))
+      (node (ref J1) (pin 3)))
+    (net (code 26) (name MISO)
+      (node (ref U1) (pin 16))
+      (node (ref J1) (pin 1)))
+    (net (code 27) (name MOSI)
+      (node (ref U1) (pin 15))
+      (node (ref J1) (pin 4)))
+    (net (code 28) (name "Net-(U1-Pad10)")
+      (node (ref U1) (pin 10)))
+    (net (code 29) (name "Net-(U1-Pad1)")
+      (node (ref U1) (pin 1)))
+    (net (code 30) (name "Net-(C2-Pad1)")
+      (node (ref C2) (pin 1))
+      (node (ref XTAL1) (pin 1))
+      (node (ref U1) (pin 8)))
+    (net (code 31) (name "Net-(PCA9685-Pad20)")
+      (node (ref PCA9685) (pin 20)))
+    (net (code 32) (name "Net-(PCA9685-Pad6)")
+      (node (ref R2) (pin 1))
+      (node (ref PCA9685) (pin 6)))
+    (net (code 33) (name "Net-(PCA9685-Pad25)")
+      (node (ref PCA9685) (pin 25)))
+    (net (code 34) (name "Net-(PCA9685-Pad22)")
+      (node (ref PCA9685) (pin 22)))
+    (net (code 35) (name "Net-(PCA9685-Pad21)")
+      (node (ref PCA9685) (pin 21)))
+    (net (code 36) (name "Net-(PCA9685-Pad7)")
+      (node (ref R3) (pin 1))
+      (node (ref PCA9685) (pin 7)))
+    (net (code 37) (name "Net-(PCA9685-Pad19)")
+      (node (ref PCA9685) (pin 19)))
+    (net (code 38) (name "Net-(PCA9685-Pad18)")
+      (node (ref PCA9685) (pin 18)))
+    (net (code 39) (name "Net-(PCA9685-Pad17)")
+      (node (ref PCA9685) (pin 17)))
+    (net (code 40) (name "Net-(PCA9685-Pad16)")
+      (node (ref PCA9685) (pin 16)))
+    (net (code 41) (name "Net-(PCA9685-Pad15)")
+      (node (ref PCA9685) (pin 15)))
+    (net (code 42) (name "Net-(PCA9685-Pad13)")
+      (node (ref PCA9685) (pin 13)))
+    (net (code 43) (name "Net-(PCA9685-Pad12)")
+      (node (ref PCA9685) (pin 12)))
+    (net (code 44) (name "Net-(PCA9685-Pad11)")
+      (node (ref PCA9685) (pin 11)))
+    (net (code 45) (name "Net-(PCA9685-Pad10)")
+      (node (ref PCA9685) (pin 10)))
+    (net (code 46) (name "Net-(U1-Pad32)")
+      (node (ref U2) (pin 3))
+      (node (ref U2) (pin 2))
+      (node (ref U1) (pin 32)))
+    (net (code 47) (name "Net-(U1-Pad30)")
+      (node (ref U1) (pin 30))
+      (node (ref U2) (pin 1)))
+    (net (code 48) (name "Net-(Q2-Pad1)")
+      (node (ref Q2) (pin 1))
+      (node (ref R3) (pin 2)))
+    (net (code 49) (name "Net-(P4-Pad1)")
+      (node (ref P4) (pin 1))
+      (node (ref Q2) (pin 2)))
+    (net (code 50) (name "Net-(P4-Pad3)")
+      (node (ref P4) (pin 3))
+      (node (ref Q1) (pin 2)))
+    (net (code 51) (name "Net-(P1-Pad1)")
+      (node (ref P1) (pin 1))
+      (node (ref P2) (pin 2))
+      (node (ref U2) (pin 7)))
+    (net (code 52) (name "Net-(P1-Pad2)")
+      (node (ref U2) (pin 6))
+      (node (ref P1) (pin 2))
+      (node (ref P2) (pin 1)))
+    (net (code 53) (name "Net-(U1-Pad31)")
+      (node (ref U2) (pin 4))
+      (node (ref U1) (pin 31)))))

kicad/Stairs.pro

@@ -0,0 +1,40 @@
+update=25-11-2018 18:30:03
+version=1
+last_client=kicad
+[pcbnew]
+version=1
+LastNetListRead=
+UseCmpFile=1
+PadDrill=0.600000000000
+PadDrillOvalY=0.600000000000
+PadSizeH=1.500000000000
+PadSizeV=1.500000000000
+PcbTextSizeV=1.500000000000
+PcbTextSizeH=1.500000000000
+PcbTextThickness=0.300000000000
+ModuleTextSizeV=1.000000000000
+ModuleTextSizeH=1.000000000000
+ModuleTextSizeThickness=0.150000000000
+SolderMaskClearance=0.000000000000
+SolderMaskMinWidth=0.000000000000
+DrawSegmentWidth=0.200000000000
+BoardOutlineThickness=0.100000000000
+ModuleOutlineThickness=0.150000000000
+[cvpcb]
+version=1
+NetIExt=net
+[general]
+version=1
+[eeschema]
+version=1
+LibDir=
+[schematic_editor]
+version=1
+PageLayoutDescrFile=
+PlotDirectoryName=
+SubpartIdSeparator=0
+SubpartFirstId=65
+NetFmtName=
+SpiceAjustPassiveValues=0
+LabSize=50
+ERC_TestSimilarLabels=1

kicad/fp-lib-table

@@ -0,0 +1,6 @@
+(fp_lib_table
+  (lib (name AMS1117-5.0)(type Legacy)(uri ${KIPRJMOD}/libs/AMS1117-5.0.mod)(options "")(descr ""))
+  (lib (name MAX485)(type Legacy)(uri ${KIPRJMOD}/libs/MAX485.mod)(options "")(descr ""))
+  (lib (name SMD-BUTTON_4P-5.2X5.2X1.5MM-SKQGAKE010_)(type Legacy)(uri ${KIPRJMOD}/libs/SMD-BUTTON_4P-5.2X5.2X1.5MM-SKQGAKE010_.mod)(options "")(descr ""))
+  (lib (name MAX485-SO8)(type KiCad)(uri ${KIPRJMOD}/libs/MAX485-SO8.pretty)(options "")(descr ""))
+)

kicad/libs/AMS1117-5.0.bck

@@ -0,0 +1,29 @@
+EESchema-LIBRARY Version 2.3
+#encoding utf-8
+#(c) SnapEDA 2016 (snapeda.com)
+#This work is licensed under a Creative Commons Attribution-ShareAlike 4.0 International License (CC BY-SA) with Design Exception 1.0
+#
+# AMS1117-5.0
+#
+DEF AMS1117-5.0 U 0 40 Y Y 1 L N
+F0 "U" -400 220 50 H V L BNN
+F1 "AMS1117-5.0" -401 -321 50 H V L BNN
+F2 "SOT229P700X180-4N" 0 0 50 H I L BNN
+F3 "Sot223/Pkg 1-Amp 5-Volt Low Drop Out Voltage Regulatator" 0 0 50 H I L BNN
+F4 "Unavailable" 0 0 50 H I L BNN
+F5 "Advanced Monolithic Systems" 0 0 50 H I L BNN
+F6 "None" 0 0 50 H I L BNN
+F7 "None" 0 0 50 H I L BNN
+F8 "AMS1117-5.0" 0 0 50 H I L BNN
+DRAW
+P 2 0 0 10 -400 200 400 200 N
+P 2 0 0 10 400 200 400 -200 N
+P 2 0 0 10 400 -200 -400 -200 N
+P 2 0 0 10 -400 -200 -400 200 N
+X VIN 3 -600 100 200 R 40 40 0 0 I 
+X VOUT 2 600 100 200 L 40 40 0 0 O 
+X ADJ/GND 1 600 -100 200 L 40 40 0 0 W 
+ENDDRAW
+ENDDEF
+#
+# End Library

kicad/libs/AMS1117-5.0.dcm

@@ -0,0 +1,3 @@
+EESchema-DOCLIB  Version 2.0
+#
+#End Doc Library

kicad/libs/AMS1117-5.0.lib

@@ -0,0 +1,24 @@
+EESchema-LIBRARY Version 2.4
+#encoding utf-8
+#
+# AMS1117-5.0
+#
+DEF AMS1117-5.0 U 0 40 Y Y 1 L N
+F0 "U" -400 220 50 H V L BNN
+F1 "AMS1117-5.0" -401 -321 50 H V L BNN
+F2 "SOT229P700X180-4N" 0 0 50 H I L BNN
+F3 "Sot223/Pkg 1-Amp 5-Volt Low Drop Out Voltage Regulatator" 0 0 50 H I L BNN
+F4 "Unavailable" 0 0 50 H I L BNN
+F5 "Advanced Monolithic Systems" 0 0 50 H I L BNN
+F6 "None" 0 0 50 H I L BNN
+F7 "None" 0 0 50 H I L BNN
+F8 "AMS1117-5.0" 0 0 50 H I L BNN
+DRAW
+S -400 200 400 -200 0 1 0 f
+X ADJ/GND 1 600 -100 200 L 40 40 0 0 W
+X VOUT 2 600 100 200 L 40 40 0 0 O
+X VIN 3 -600 100 200 R 40 40 0 0 I
+ENDDRAW
+ENDDEF
+#
+#End Library

kicad/libs/AMS1117-5.0.mod

@@ -0,0 +1,73 @@
+PCBNEW-LibModule-V1  
+# encoding utf-8
+Units mm
+$INDEX
+SOT229P700X180-4N
+$EndINDEX
+$MODULE SOT229P700X180-4N
+Po 0 0 0 15 00000000 00000000 ~~
+Li SOT229P700X180-4N
+Cd 
+Sc 00000000
+At SMD
+Op 0 0 0
+.SolderMask 0
+.SolderPaste 0
+T0 -1.15242 -5.14581 1.00211 1.00211 0 0.05 N V 21 "SOT229P700X180-4N"
+T1 -0.516467 5.54073 1.00285 1.00285 0 0.05 N V 21 "VAL**"
+DS -3.36 1.86 -3.36 -1.86 0.127 24
+DS -3.36 -1.86 3.36 -1.86 0.127 24
+DS 3.36 -1.86 3.36 1.86 0.127 24
+DS 3.36 1.86 -3.36 1.86 0.127 24
+DS -3.36 1.86 -3.36 -1.86 0.127 21
+DS 3.36 1.86 3.36 -1.86 0.127 21
+DS -3.36 1.86 -3.1 1.86 0.127 21
+DS 3.11 1.86 3.36 1.86 0.127 21
+DS 3.36 -1.86 1.87 -1.86 0.127 21
+DS -1.76 -1.86 -3.36 -1.86 0.127 21
+DC -2.29 4.373 -2.19 4.373 0.2 21
+DS -3.61 -2.11 -3.61 2.11 0.05 26
+DS -3.61 2.11 -3.01 2.11 0.05 26
+DS -3.01 2.11 -3.01 4.25 0.05 26
+DS -3.01 4.25 3.01 4.25 0.05 26
+DS 3.01 4.25 3.01 2.11 0.05 26
+DS 3.01 2.11 3.61 2.11 0.05 26
+DS 3.61 2.11 3.61 -2.11 0.05 26
+DS 3.61 -2.11 1.87 -2.11 0.05 26
+DS 1.87 -2.11 1.87 -4.25 0.05 26
+DS 1.87 -4.25 -1.87 -4.25 0.05 26
+DS -1.87 -4.25 -1.87 -2.11 0.05 26
+DS -1.87 -2.11 -3.61 -2.11 0.05 26
+$PAD
+Sh "1" R 0.93 1.31 0 0 0
+At SMD N 00888000
+.SolderMask 0
+.SolderPaste 0
+Ne 0 ""
+Po -2.29 3.345
+$EndPAD
+$PAD
+Sh "2" R 0.93 1.31 0 0 0
+At SMD N 00888000
+.SolderMask 0
+.SolderPaste 0
+Ne 0 ""
+Po 0 3.345
+$EndPAD
+$PAD
+Sh "3" R 0.93 1.31 0 0 0
+At SMD N 00888000
+.SolderMask 0
+.SolderPaste 0
+Ne 0 ""
+Po 2.29 3.345
+$EndPAD
+$PAD
+Sh "4" R 3.24 1.31 0 0 0
+At SMD N 00888000
+.SolderMask 0
+.SolderPaste 0
+Ne 0 ""
+Po 0 -3.345
+$EndPAD
+$EndMODULE SOT229P700X180-4N

kicad/libs/MAX485-SO8.pretty/SO-8.kicad_mod

@@ -0,0 +1,43 @@
+(module SO-8 (layer F.Cu) (tedit 5BFB111F)
+  (descr "8-Lead Plastic Small Outline, 5.3x6.2mm Body (http://www.ti.com.cn/cn/lit/ds/symlink/tl7705a.pdf)")
+  (tags "SOIC 1.27")
+  (attr smd)
+  (fp_text reference REF** (at 0 -4.13) (layer F.SilkS)
+    (effects (font (size 1 1) (thickness 0.15)))
+  )
+  (fp_text value SO-8 (at 0 4.13) (layer F.Fab)
+    (effects (font (size 1 1) (thickness 0.15)))
+  )
+  (fp_line (start -2.75 -2.55) (end -3.7 -2.55) (layer F.SilkS) (width 0.15))
+  (fp_line (start -2.75 3.205) (end 2.75 3.205) (layer F.SilkS) (width 0.15))
+  (fp_line (start -2.75 -3.205) (end 2.75 -3.205) (layer F.SilkS) (width 0.15))
+  (fp_line (start -2.75 3.205) (end -2.75 2.455) (layer F.SilkS) (width 0.15))
+  (fp_line (start 2.75 3.205) (end 2.75 2.455) (layer F.SilkS) (width 0.15))
+  (fp_line (start 2.75 -3.205) (end 2.75 -2.455) (layer F.SilkS) (width 0.15))
+  (fp_line (start -2.75 -3.205) (end -2.75 -2.55) (layer F.SilkS) (width 0.15))
+  (fp_line (start -3.9 3.35) (end 4.83 3.35) (layer F.CrtYd) (width 0.05))
+  (fp_line (start -3.9 -3.35) (end 3.9 -3.35) (layer F.CrtYd) (width 0.05))
+  (fp_line (start 3.9 -3.35) (end 3.9 3.35) (layer F.CrtYd) (width 0.05))
+  (fp_line (start -3.9 -3.35) (end -3.9 3.35) (layer F.CrtYd) (width 0.05))
+  (fp_line (start -2.65 -2.1) (end -1.65 -3.1) (layer F.Fab) (width 0.15))
+  (fp_line (start -2.65 3.1) (end -2.65 -2.1) (layer F.Fab) (width 0.15))
+  (fp_line (start 2.65 3.1) (end -2.65 3.1) (layer F.Fab) (width 0.15))
+  (fp_line (start 2.65 -3.1) (end 2.65 3.1) (layer F.Fab) (width 0.15))
+  (fp_line (start -1.65 -3.1) (end 2.65 -3.1) (layer F.Fab) (width 0.15))
+  (fp_text user %R (at 0 0) (layer F.Fab)
+    (effects (font (size 1 1) (thickness 0.15)))
+  )
+  (pad 8 smd rect (at 3.2 -1.905) (size 1 0.55) (layers F.Cu F.Paste F.Mask))
+  (pad 7 smd rect (at 3.2 -0.635) (size 1 0.55) (layers F.Cu F.Paste F.Mask))
+  (pad 6 smd rect (at 3.2 0.635) (size 1 0.55) (layers F.Cu F.Paste F.Mask))
+  (pad 5 smd rect (at 3.2 1.905) (size 1 0.55) (layers F.Cu F.Paste F.Mask))
+  (pad 4 smd rect (at -3.2 1.905) (size 1 0.55) (layers F.Cu F.Paste F.Mask))
+  (pad 3 smd rect (at -3.2 0.635) (size 1 0.55) (layers F.Cu F.Paste F.Mask))
+  (pad 2 smd rect (at -3.2 -0.635) (size 1 0.55) (layers F.Cu F.Paste F.Mask))
+  (pad 1 smd rect (at -3.2 -1.9) (size 1 0.55) (layers F.Cu F.Paste F.Mask))
+  (model ${KISYS3DMOD}/Housings_SOIC.3dshapes/SO-8_5.3x6.2mm_Pitch1.27mm.wrl
+    (at (xyz 0 0 0))
+    (scale (xyz 1 1 1))
+    (rotate (xyz 0 0 0))
+  )
+)

kicad/libs/MAX485-SO8.pretty/SO-8_5.3x6.2mm_Pitch1.27mm.kicad_mod

@@ -0,0 +1,43 @@
+(module Housings_SOIC:SO-8_5.3x6.2mm_Pitch1.27mm (layer F.Cu) (tedit 59920130)
+  (descr "8-Lead Plastic Small Outline, 5.3x6.2mm Body (http://www.ti.com.cn/cn/lit/ds/symlink/tl7705a.pdf)")
+  (tags "SOIC 1.27")
+  (attr smd)
+  (fp_text reference REF** (at 0 -4.13) (layer F.SilkS)
+    (effects (font (size 1 1) (thickness 0.15)))
+  )
+  (fp_text value SO-8_5.3x6.2mm_Pitch1.27mm (at 0 4.13) (layer F.Fab)
+    (effects (font (size 1 1) (thickness 0.15)))
+  )
+  (fp_line (start -2.75 -2.55) (end -4.5 -2.55) (layer F.SilkS) (width 0.15))
+  (fp_line (start -2.75 3.205) (end 2.75 3.205) (layer F.SilkS) (width 0.15))
+  (fp_line (start -2.75 -3.205) (end 2.75 -3.205) (layer F.SilkS) (width 0.15))
+  (fp_line (start -2.75 3.205) (end -2.75 2.455) (layer F.SilkS) (width 0.15))
+  (fp_line (start 2.75 3.205) (end 2.75 2.455) (layer F.SilkS) (width 0.15))
+  (fp_line (start 2.75 -3.205) (end 2.75 -2.455) (layer F.SilkS) (width 0.15))
+  (fp_line (start -2.75 -3.205) (end -2.75 -2.55) (layer F.SilkS) (width 0.15))
+  (fp_line (start -4.83 3.35) (end 4.83 3.35) (layer F.CrtYd) (width 0.05))
+  (fp_line (start -4.83 -3.35) (end 4.83 -3.35) (layer F.CrtYd) (width 0.05))
+  (fp_line (start 4.83 -3.35) (end 4.83 3.35) (layer F.CrtYd) (width 0.05))
+  (fp_line (start -4.83 -3.35) (end -4.83 3.35) (layer F.CrtYd) (width 0.05))
+  (fp_line (start -2.65 -2.1) (end -1.65 -3.1) (layer F.Fab) (width 0.15))
+  (fp_line (start -2.65 3.1) (end -2.65 -2.1) (layer F.Fab) (width 0.15))
+  (fp_line (start 2.65 3.1) (end -2.65 3.1) (layer F.Fab) (width 0.15))
+  (fp_line (start 2.65 -3.1) (end 2.65 3.1) (layer F.Fab) (width 0.15))
+  (fp_line (start -1.65 -3.1) (end 2.65 -3.1) (layer F.Fab) (width 0.15))
+  (fp_text user %R (at 0 0) (layer F.Fab)
+    (effects (font (size 1 1) (thickness 0.15)))
+  )
+  (pad 8 smd rect (at 3.7 -1.905) (size 1.75 0.55) (layers F.Cu F.Paste F.Mask))
+  (pad 7 smd rect (at 3.7 -0.635) (size 1.75 0.55) (layers F.Cu F.Paste F.Mask))
+  (pad 6 smd rect (at 3.7 0.635) (size 1.75 0.55) (layers F.Cu F.Paste F.Mask))
+  (pad 5 smd rect (at 3.7 1.905) (size 1.75 0.55) (layers F.Cu F.Paste F.Mask))
+  (pad 4 smd rect (at -3.7 1.905) (size 1.75 0.55) (layers F.Cu F.Paste F.Mask))
+  (pad 3 smd rect (at -3.7 0.635) (size 1.75 0.55) (layers F.Cu F.Paste F.Mask))
+  (pad 2 smd rect (at -3.7 -0.635) (size 1.75 0.55) (layers F.Cu F.Paste F.Mask))
+  (pad 1 smd rect (at -3.7 -1.905) (size 1.75 0.55) (layers F.Cu F.Paste F.Mask))
+  (model ${KISYS3DMOD}/Housings_SOIC.3dshapes/SO-8_5.3x6.2mm_Pitch1.27mm.wrl
+    (at (xyz 0 0 0))
+    (scale (xyz 1 1 1))
+    (rotate (xyz 0 0 0))
+  )
+)

kicad/libs/MAX485.bck

@@ -0,0 +1,3 @@
+EESchema-DOCLIB  Version 2.0
+#
+#End Doc Library

kicad/libs/MAX485.dcm

@@ -0,0 +1,3 @@
+EESchema-DOCLIB  Version 2.0
+#
+#End Doc Library

kicad/libs/MAX485.lib

@@ -0,0 +1,32 @@
+EESchema-LIBRARY Version 2.4
+#encoding utf-8
+#
+# MAX485
+#
+DEF MAX485 U 0 40 Y Y 1 L N
+F0 "U" -401 301 50 H V L BNN
+F1 "MAX485" -401 -301 50 H V L BNN
+F2 "" 0 0 50 H I C CNN
+F3 "Maxim Integrated" 0 0 50 H I L BNN
+F4 "None" 0 0 50 H I L BNN
+F5 "Unavailable" 0 0 50 H I L BNN
+F6 "None" 0 0 50 H I L BNN
+F7 "MAX485" 0 0 50 H I L BNN
+$FPLIST
+ DIL08
+ SO08
+$ENDFPLIST
+DRAW
+S -400 300 400 -200 0 1 0 f
+X RO 1 -600 200 200 R 40 40 0 0 B
+X RE 2 -600 100 200 R 40 40 0 0 B I
+X DE 3 -600 0 200 R 40 40 0 0 B
+X DI 4 -600 -100 200 R 40 40 0 0 B
+X GND 5 600 -100 200 L 40 40 0 0 W
+X A 6 600 0 200 L 40 40 0 0 B
+X B 7 600 100 200 L 40 40 0 0 B
+X VCC 8 600 200 200 L 40 40 0 0 W
+ENDDRAW
+ENDDEF
+#
+#End Library

kicad/libs/MAX485.mod

@@ -0,0 +1,214 @@
+PCBNEW-LibModule-V1  
+# encoding utf-8
+Units mm
+$INDEX
+DIL08
+SO08
+$EndINDEX
+$MODULE DIL08
+Po 0 0 0 15 00000000 00000000 ~~
+Li DIL08
+Cd <b>Dual In Line</b>
+Sc 00000000
+At STD
+Op 0 0 0
+.SolderMask 0
+.SolderPaste 0
+T0 -6.35758 1.27152 1.00119 1.00119 900 0.05 N V 21 "DIL08"
+T1 5.00698e-06 -2.00279e-06 1.00244 1.00244 0 0.05 N V 21 "VAL**"
+DS 5.08 -5.08 -5.08 -5.08 0.1524 21
+DS -5.08 5.08 5.08 5.08 0.1524 21
+DS 5.08 -5.08 5.08 -2.54 0.1524 21
+DS -5.08 -5.08 -5.08 -2.54 0.1524 21
+DS -5.08 5.08 -5.08 2.54 0.1524 21
+DA -5.08 0 -5.08 -1.016 1800 0.1524 21
+DS -5.08 -2.54 5.08 -2.54 0.1524 21
+DS -5.08 -2.54 -5.08 -1.016 0.2032 21
+DS 5.08 -2.54 5.08 2.54 0.1524 21
+DS -5.08 2.54 5.08 2.54 0.1524 21
+DS -5.08 2.54 -5.08 1.016 0.1524 21
+DS 5.08 2.54 5.08 5.08 0.1524 21
+$PAD
+Sh "1" C 1.6002 1.6002 0 0 0
+Dr 0.8128 0 0
+At STD N 00C0FFFF
+.SolderMask 0
+Ne 0 ""
+Po -3.81 3.81
+$EndPAD
+$PAD
+Sh "2" C 1.6002 1.6002 0 0 0
+Dr 0.8128 0 0
+At STD N 00C0FFFF
+.SolderMask 0
+Ne 0 ""
+Po -1.27 3.81
+$EndPAD
+$PAD
+Sh "3" C 1.6002 1.6002 0 0 0
+Dr 0.8128 0 0
+At STD N 00C0FFFF
+.SolderMask 0
+Ne 0 ""
+Po 1.27 3.81
+$EndPAD
+$PAD
+Sh "4" C 1.6002 1.6002 0 0 0
+Dr 0.8128 0 0
+At STD N 00C0FFFF
+.SolderMask 0
+Ne 0 ""
+Po 3.81 3.81
+$EndPAD
+$PAD
+Sh "5" C 1.6002 1.6002 0 0 0
+Dr 0.8128 0 0
+At STD N 00C0FFFF
+.SolderMask 0
+Ne 0 ""
+Po 3.81 -3.81
+$EndPAD
+$PAD
+Sh "6" C 1.6002 1.6002 0 0 0
+Dr 0.8128 0 0
+At STD N 00C0FFFF
+.SolderMask 0
+Ne 0 ""
+Po 1.27 -3.81
+$EndPAD
+$PAD
+Sh "7" C 1.6002 1.6002 0 0 0
+Dr 0.8128 0 0
+At STD N 00C0FFFF
+.SolderMask 0
+Ne 0 ""
+Po -1.27 -3.81
+$EndPAD
+$PAD
+Sh "8" C 1.6002 1.6002 0 0 0
+Dr 0.8128 0 0
+At STD N 00C0FFFF
+.SolderMask 0
+Ne 0 ""
+Po -3.81 -3.81
+$EndPAD
+$EndMODULE DIL08
+$MODULE SO08
+Po 0 0 0 15 00000000 00000000 ~~
+Li SO08
+Cd <b>Small Outline Package</b> Fits JEDEC packages (narrow SOIC-8)
+Sc 00000000
+At SMD
+Op 0 0 0
+.SolderMask 0
+.SolderPaste 0
+T0 -0.45744 -0.203305 0.320166 0.320166 0 0.05 N V 21 "SO08"
+T1 -0.254561 0.432759 0.32071 0.32071 0 0.05 N V 21 "VAL**"
+DS -2.362 1.803 2.362 1.803 0.1524 24
+DS 2.362 -1.803 -2.362 -1.803 0.1524 24
+DC -1.8034 0.9906 -1.6598 0.9906 0.2032 21
+DP 0 0 0 0 4 0 24
+Dl -2.08797 1.8542
+Dl -1.7272 1.8542
+Dl -1.7272 2.87731
+Dl -2.08797 2.87731
+DP 0 0 0 0 4 0 24
+Dl -0.813844 1.8542
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+DP 0 0 0 0 4 0 24
+Dl 0.458097 1.8542
+Dl 0.8128 1.8542
+Dl 0.8128 2.87584
+Dl 0.458097 2.87584
+DP 0 0 0 0 4 0 24
+Dl 1.72892 1.8542
+Dl 2.0828 1.8542
+Dl 2.0828 2.87306
+Dl 1.72892 2.87306
+DP 0 0 0 0 4 0 24
+Dl -2.08675 -2.8702
+Dl -1.7272 -2.8702
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+Dl -2.08675 -1.85772
+DP 0 0 0 0 4 0 24
+Dl -0.813701 -2.8702
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+DP 0 0 0 0 4 0 24
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+DP 0 0 0 0 4 0 24
+Dl 1.73057 -2.8702
+Dl 2.0828 -2.8702
+Dl 2.0828 -1.85782
+Dl 1.73057 -1.85782
+$PAD
+Sh "1" R 0.6096 2.2098 0 0 0
+At SMD N 00888000
+.SolderMask 0
+.SolderPaste 0
+Ne 0 ""
+Po -1.905 2.6162
+$EndPAD
+$PAD
+Sh "2" R 0.6096 2.2098 0 0 0
+At SMD N 00888000
+.SolderMask 0
+.SolderPaste 0
+Ne 0 ""
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+$EndPAD
+$PAD
+Sh "3" R 0.6096 2.2098 0 0 0
+At SMD N 00888000
+.SolderMask 0
+.SolderPaste 0
+Ne 0 ""
+Po 0.635 2.6162
+$EndPAD
+$PAD
+Sh "4" R 0.6096 2.2098 0 0 0
+At SMD N 00888000
+.SolderMask 0
+.SolderPaste 0
+Ne 0 ""
+Po 1.905 2.6162
+$EndPAD
+$PAD
+Sh "5" R 0.6096 2.2098 0 0 0
+At SMD N 00888000
+.SolderMask 0
+.SolderPaste 0
+Ne 0 ""
+Po 1.905 -2.6162
+$EndPAD
+$PAD
+Sh "6" R 0.6096 2.2098 0 0 0
+At SMD N 00888000
+.SolderMask 0
+.SolderPaste 0
+Ne 0 ""
+Po 0.635 -2.6162
+$EndPAD
+$PAD
+Sh "7" R 0.6096 2.2098 0 0 0
+At SMD N 00888000
+.SolderMask 0
+.SolderPaste 0
+Ne 0 ""
+Po -0.635 -2.6162
+$EndPAD
+$PAD
+Sh "8" R 0.6096 2.2098 0 0 0
+At SMD N 00888000
+.SolderMask 0
+.SolderPaste 0
+Ne 0 ""
+Po -1.905 -2.6162
+$EndPAD
+$EndMODULE SO08

kicad/libs/PCA9685-TSSOP.bck

@@ -0,0 +1,43 @@
+EESchema-LIBRARY Version 2.2  Date: 04/05/2014-04:12:59
+#
+# PCA9685-TSSOP
+#
+DEF PCA9685-TSSOP U 0 40 Y Y 1 0 N
+F0 "U" 0 -100 50 H V C C
+F1 "PCA9685-TSSOP" 0 100 50 H V C C
+F2 "MODULE" 0 0 50 H I C C
+F3 "DOCUMENTATION" 0 0 50 H I C C
+DRAW
+S -450 -850 450 850 1 0 0 N
+X A0 1 -750 650 300 R 50 50 1 1 I
+X A1 2 -750 550 300 R 50 50 1 1 I
+X A2 3 -750 450 300 R 50 50 1 1 I
+X A3 4 -750 350 300 R 50 50 1 1 I
+X A4 5 -750 250 300 R 50 50 1 1 I
+X LED0 6 -750 150 300 R 50 50 1 1 O
+X LED1 7 -750 50 300 R 50 50 1 1 O
+X LED2 8 -750 -50 300 R 50 50 1 1 O
+X LED3 9 -750 -150 300 R 50 50 1 1 O
+X LED4 10 -750 -250 300 R 50 50 1 1 O
+X LED5 11 -750 -350 300 R 50 50 1 1 O
+X LED6 12 -750 -450 300 R 50 50 1 1 O
+X LED7 13 -750 -550 300 R 50 50 1 1 O
+X GND 14 -750 -650 300 R 50 50 1 1 I
+X LED8 15 750 -650 300 L 50 50 1 1 O
+X LED9 16 750 -550 300 L 50 50 1 1 O
+X LED10 17 750 -450 300 L 50 50 1 1 O
+X LED11 18 750 -350 300 L 50 50 1 1 O
+X LED12 19 750 -250 300 L 50 50 1 1 O
+X LED13 20 750 -150 300 L 50 50 1 1 O
+X LED14 21 750 -50 300 L 50 50 1 1 O
+X LED15 22 750 50 300 L 50 50 1 1 O
+X OE 23 750 150 300 L 50 50 1 1 I
+X A5 24 750 250 300 L 50 50 1 1 I
+X EXTCLK 25 750 350 300 L 50 50 1 1 I
+X SCL 26 750 450 300 L 50 50 1 1 I
+X SDA 27 750 550 300 L 50 50 1 1 B
+X VCC 28 750 650 300 L 50 50 1 1 I
+ENDDRAW
+ENDDEF
+#
+#End Library

kicad/libs/PCA9685-TSSOP.dcm

@@ -0,0 +1,3 @@
+EESchema-DOCLIB  Version 2.0
+#
+#End Doc Library

kicad/libs/PCA9685-TSSOP.lib

@@ -0,0 +1,44 @@
+EESchema-LIBRARY Version 2.4
+#encoding utf-8
+#
+# PCA9685-TSSOP
+#
+DEF PCA9685-TSSOP U 0 40 Y Y 1 F N
+F0 "U" 0 -100 50 H V C CNN
+F1 "PCA9685-TSSOP" 0 100 50 H V C CNN
+F2 "MODULE" 0 0 50 H I C CNN
+F3 "DOCUMENTATION" 0 0 50 H I C CNN
+DRAW
+S -450 -850 450 850 1 0 0 f
+X A0 1 -750 650 300 R 50 50 1 1 I
+X LED4 10 -750 -250 300 R 50 50 1 1 O
+X LED5 11 -750 -350 300 R 50 50 1 1 O
+X LED6 12 -750 -450 300 R 50 50 1 1 O
+X LED7 13 -750 -550 300 R 50 50 1 1 O
+X GND 14 -750 -650 300 R 50 50 1 1 I
+X LED8 15 750 -650 300 L 50 50 1 1 O
+X LED9 16 750 -550 300 L 50 50 1 1 O
+X LED10 17 750 -450 300 L 50 50 1 1 O
+X LED11 18 750 -350 300 L 50 50 1 1 O
+X LED12 19 750 -250 300 L 50 50 1 1 O
+X A1 2 -750 550 300 R 50 50 1 1 I
+X LED13 20 750 -150 300 L 50 50 1 1 O
+X LED14 21 750 -50 300 L 50 50 1 1 O
+X LED15 22 750 50 300 L 50 50 1 1 O
+X OE 23 750 150 300 L 50 50 1 1 I
+X A5 24 750 250 300 L 50 50 1 1 I
+X EXTCLK 25 750 350 300 L 50 50 1 1 I
+X SCL 26 750 450 300 L 50 50 1 1 I
+X SDA 27 750 550 300 L 50 50 1 1 B
+X VCC 28 750 650 300 L 50 50 1 1 I
+X A2 3 -750 450 300 R 50 50 1 1 I
+X A3 4 -750 350 300 R 50 50 1 1 I
+X A4 5 -750 250 300 R 50 50 1 1 I
+X LED0 6 -750 150 300 R 50 50 1 1 O
+X LED1 7 -750 50 300 R 50 50 1 1 O
+X LED2 8 -750 -50 300 R 50 50 1 1 O
+X LED3 9 -750 -150 300 R 50 50 1 1 O
+ENDDRAW
+ENDDEF
+#
+#End Library

kicad/libs/SMD-BUTTON_4P-5.2X5.2X1.5MM-SKQGAKE010_.lib

@@ -0,0 +1,47 @@
+EESchema-LIBRARY Version 2.3
+#encoding utf-8
+#(c) SnapEDA 2016 (snapeda.com)
+#This work is licensed under a Creative Commons Attribution-ShareAlike 4.0 International License (CC BY-SA) with Design Exception 1.0
+#
+# SMD-BUTTON(4P-5.2X5.2X1.5MM-SKQGAKE010)
+#
+DEF SMD-BUTTON(4P-5.2X5.2X1.5MM-SKQGAKE010) SW 0 40 Y Y 1 L N
+F0 "SW" -201 201 50 H V L BNN
+F1 "SMD-BUTTON(4P-5.2X5.2X1.5MM-SKQGAKE010)" -200 -250 50 H V L BNN
+F2 "SW4-SMD-5.2X5.2X1.5MM" 0 0 50 H I L BNN
+F3 "None" 0 0 50 H I L BNN
+F4 "SKQGAKE010" 0 0 50 H I L BNN
+F5 "None" 0 0 50 H I L BNN
+F6 "Unavailable" 0 0 50 H I L BNN
+F7 "ALPS" 0 0 50 H I L BNN
+F8 "Switch Tactile N.O. SPST Button Gull Wing 0.05A 12VDC 3.43N SMD T/R" 0 0 50 H I L BNN
+DRAW
+P 2 0 0 10 -200 200 200 200 N
+P 2 0 0 10 200 200 200 100 N
+P 2 0 0 10 200 100 200 -100 N
+P 2 0 0 10 200 -100 200 -200 N
+P 2 0 0 10 200 -200 -200 -200 N
+P 2 0 0 10 -200 -200 -200 -100 N
+P 2 0 0 10 -200 -100 -200 100 N
+P 2 0 0 10 -200 100 -200 200 N
+P 2 0 0 6 -200 100 0 100 N
+P 2 0 0 6 0 100 200 100 N
+P 2 0 0 6 0 100 0 50 N
+P 2 0 0 6 0 50 -50 -30 N
+P 2 0 0 6 0 -50 0 -100 N
+P 2 0 0 6 0 -100 200 -100 N
+P 2 0 0 6 0 -100 -200 -100 N
+P 2 0 0 6 -250 100 -200 100 N
+P 2 0 0 6 -250 -100 -200 -100 N
+P 2 0 0 6 250 -100 200 -100 N
+P 2 0 0 6 250 100 200 100 N
+C -50 -30 6 0 0 0 N
+C 0 -50 6 0 0 0 N
+X A0 1 -350 100 100 R 40 40 0 0 B 
+X A1 2 350 100 100 L 40 40 0 0 B 
+X B0 3 -350 -100 100 R 40 40 0 0 B 
+X B1 4 350 -100 100 L 40 40 0 0 B 
+ENDDRAW
+ENDDEF
+#
+# End Library

kicad/libs/SMD-BUTTON_4P-5.2X5.2X1.5MM-SKQGAKE010_.mod

@@ -0,0 +1,67 @@
+PCBNEW-LibModule-V1  
+# encoding utf-8
+Units mm
+$INDEX
+SW4-SMD-5.2X5.2X1.5MM
+$EndINDEX
+$MODULE SW4-SMD-5.2X5.2X1.5MM
+Po 0 0 0 15 00000000 00000000 ~~
+Li SW4-SMD-5.2X5.2X1.5MM
+Cd 
+Sc 00000000
+At SMD
+Op 0 0 0
+.SolderMask 0
+.SolderPaste 0
+T0 -0.523383 -3.25313 0.701862 0.701862 0 0.05 N V 21 "SW4-SMD-5.2X5.2X1.5MM"
+T1 -0.112861 -0.218191 0.501589 0.501589 0 0.05 N V 21 "VAL**"
+DS 2.6 1.46863 1.46863 2.6 0.127 24
+DS 1.5 2.6 -1.1 2.6 0.127 21
+DS -1.1 2.6 -1.45982 2.6 0.127 21
+DS -1.45982 2.6 -2.6 1.45982 0.127 24
+DS -2.6 -1.39584 -1.39584 -2.6 0.127 24
+DS -1.4 -2.6 1.5 -2.6 0.127 21
+DS 1.43381 -2.6 2.6 -1.43381 0.127 24
+DP 0 0 0 0 4 0 26
+Dl -2.50464 -2.6
+Dl 2.6 -2.6
+Dl 2.6 2.60484
+Dl -2.50464 2.60484
+DS -1.4 -2.6 -2.4 -1.6 0.127 21
+DS 1.5 -2.6 2.4 -1.7 0.127 21
+DS 1.5 2.6 2.4 1.7 0.127 21
+DS -1.45982 2.6 -1.5 2.6 0.127 21
+DS -1.5 2.6 -2.4 1.7 0.127 21
+$PAD
+Sh "1" R 1 0.7 0 0 0
+At SMD N 00888000
+.SolderMask 0
+.SolderPaste 0
+Ne 0 ""
+Po -3 -1.85
+$EndPAD
+$PAD
+Sh "2" R 1 0.7 0 0 0
+At SMD N 00888000
+.SolderMask 0
+.SolderPaste 0
+Ne 0 ""
+Po 3 -1.85
+$EndPAD
+$PAD
+Sh "3" R 1 0.7 0 0 0
+At SMD N 00888000
+.SolderMask 0
+.SolderPaste 0
+Ne 0 ""
+Po -3 1.85
+$EndPAD
+$PAD
+Sh "4" R 1 0.7 0 0 0
+At SMD N 00888000
+.SolderMask 0
+.SolderPaste 0
+Ne 0 ""
+Po 3 1.85
+$EndPAD
+$EndMODULE SW4-SMD-5.2X5.2X1.5MM

kicad/sym-lib-table

@@ -0,0 +1,6 @@
+(sym_lib_table
+  (lib (name PCA9685-TSSOP)(type Legacy)(uri ${KIPRJMOD}/libs/PCA9685-TSSOP.lib)(options "")(descr ""))
+  (lib (name MAX485)(type Legacy)(uri ${KIPRJMOD}/libs/MAX485.lib)(options "")(descr ""))
+  (lib (name AMS1117-5.0)(type Legacy)(uri ${KIPRJMOD}/libs/AMS1117-5.0.lib)(options "")(descr ""))
+  (lib (name SMD-BUTTON_4P-5.2X5.2X1.5MM-SKQGAKE010_)(type Legacy)(uri ${KIPRJMOD}/libs/SMD-BUTTON_4P-5.2X5.2X1.5MM-SKQGAKE010_.lib)(options "")(descr ""))
+)

module/build.bat

@@ -0,0 +1 @@
+@pio run

module/fuses.bat

@@ -0,0 +1,7 @@
+@Echo Off
+REM Internal 8 Mhz oscillator, no clock division
+REM   http://www.engbedded.com/fusecalc/
+REM avrdude -c usbtiny -p m328p -e -U lfuse:w:0xE2:m -U hfuse:w:0xd9:m -U efuse:w:0x07:m
+
+REM External 8+ Mhz oscillator, no clock division
+avrdude -c usbtiny -p m328p -e -U lfuse:w:0xcf:m -U hfuse:w:0xd9:m -U efuse:w:0x07:m

module/mockmaster/mockmaster.ino

@@ -0,0 +1,283 @@
+/*
+ * Stairs lighting
+ * Copyright 2017 (c) Mark van Renswoude
+ *
+ * https://git.x2software.net/pub/Stairs
+*/
+#include <RS485_non_blocking.h>
+#include <SoftwareSerial.h>
+#define SERIAL_COMMANDS_DEBUG
+#include <SerialCommands.h>
+#include "protocol.h"
+
+
+const uint8_t PinRS485Receive = 2;
+const uint8_t PinRS485Transmit = 3;
+const uint8_t PinRS485WriteEnable = 4;
+
+const uint32_t RS485BaudRate = 76800;
+
+
+/*
+ * RS485 communication
+ */
+SoftwareSerial rs485(PinRS485Receive, PinRS485Transmit);
+
+size_t doWrite(const byte what)
+{
+  return rs485.write (what);  
+}
+
+int doAvailable()
+{
+  return rs485.available ();  
+}
+
+int doRead()
+{
+  return rs485.read ();  
+}
+
+RS485 comm(doRead, doAvailable, doWrite, 20);
+  
+
+
+/*
+ * Serial communication (user input)
+ */
+SerialCommand cmdPing("ping", handlePingCommand);
+SerialCommand cmdDisplay("display", handleDisplayCommand);
+SerialCommand cmdLink("link", handleLinkCommand);
+SerialCommand cmdLinkAssign("assign", handleLinkAssignCommand);
+SerialCommand cmdLinkStop("stop", handleLinkStopCommand);
+SerialCommand cmdSetPWM("setPWM", handlesetPWMCommand);
+SerialCommand cmdGetSensors("getSensors", handlegetSensorsCommand);
+
+
+char commandBuffer[32];
+SerialCommands serialCommands(&Serial, commandBuffer, sizeof(commandBuffer), "\r\n", " ");
+
+void cmdUnrecognized(SerialCommands* sender, const char* cmd)
+{
+  sender->GetSerial()->print("ERROR: Unrecognized command [");
+  sender->GetSerial()->print(cmd);
+  sender->GetSerial()->println("]");
+}
+
+
+bool inLink = false;
+
+
+void showCommands()
+{
+  Serial.println("");
+  Serial.println("Available commands:");
+  Serial.println("  ping [moduleIndex]");
+  Serial.println("  display");
+  Serial.println("  link");
+  Serial.println("  setPWM [moduleIndex] [flags] [value1] [value2]");
+  Serial.println("  getSensors [moduleIndex]");
+  Serial.println("");  
+}
+
+void setup()
+{
+  pinMode(PinRS485WriteEnable, OUTPUT); 
+  
+  rs485.begin(RS485BaudRate); 
+  comm.begin();
+
+  Serial.begin(115200);
+  serialCommands.AddCommand(&cmdPing);
+  serialCommands.AddCommand(&cmdDisplay);
+  serialCommands.AddCommand(&cmdLink);
+  serialCommands.AddCommand(&cmdLinkAssign);
+  serialCommands.AddCommand(&cmdLinkStop);
+  serialCommands.AddCommand(&cmdSetPWM);
+  serialCommands.AddCommand(&cmdGetSensors);
+  serialCommands.SetDefaultHandler(&cmdUnrecognized);
+
+  Serial.println("Stairs module Mock Master ready");
+  showCommands();
+}
+
+
+void loop ()
+{
+  serialCommands.ReadSerial();
+
+  if (comm.update())
+    handleCommMessage();
+}
+
+
+void sendCommMessage(const byte* data, size_t len)
+{
+  Serial.print("Raw out: ");
+  byte* ptr = data;
+  for (size_t i = 0; i < len; i++, ptr++)
+  {
+    Serial.print(*ptr, HEX);
+    Serial.print(' ');
+  }
+  Serial.println("");
+  
+  
+  digitalWrite(PinRS485WriteEnable, HIGH);
+  comm.sendMsg(data, len);
+  digitalWrite(PinRS485WriteEnable, LOW);
+}
+
+
+void handlePingCommand(SerialCommands* sender)
+{
+  if (inLink) return;
+  
+  int moduleIndex = atoi(sender->Next());
+  
+  sender->GetSerial()->println("> Ping");
+  const byte msg[] = { CommandPing, moduleIndex };
+  sendCommMessage(msg, sizeof(msg));
+}
+
+
+void handleDisplayCommand(SerialCommands* sender)
+{
+  if (inLink) return;
+
+  sender->GetSerial()->println("> DisplayModuleIndex");
+  const byte msg[] = { CommandDisplayModuleIndex };
+  sendCommMessage(msg, sizeof(msg));
+}
+
+
+void handleLinkCommand(SerialCommands* sender)
+{
+  if (inLink) return;
+
+  sender->GetSerial()->println("> Link");
+  const byte msg[] = { CommandStartLink };
+  sendCommMessage(msg, sizeof(msg));
+    
+  sender->GetSerial()->println("");  
+  sender->GetSerial()->println("Available commands:");
+  sender->GetSerial()->println("  assign [moduleIndex]");
+  sender->GetSerial()->println("  stop");
+  sender->GetSerial()->println("");
+
+  inLink = true;
+}
+
+
+void handleLinkAssignCommand(SerialCommands* sender)
+{
+  if (!inLink) return;
+
+  int moduleIndex = atoi(sender->Next());
+
+  sender->GetSerial()->println("> LinkRequest response");
+  const byte msg[] = { ResponseRequestLink, moduleIndex };
+  sendCommMessage(msg, sizeof(msg));  
+}
+
+
+void handleLinkStopCommand(SerialCommands* sender)
+{
+  if (!inLink) return;
+
+  sender->GetSerial()->println("> StopLink");
+  const byte msg[] = { CommandStopLink };
+  sendCommMessage(msg, sizeof(msg));
+
+  inLink = false;
+  showCommands();
+}
+
+
+void handlesetPWMCommand(SerialCommands* sender)
+{
+  if (inLink) return;
+
+  int moduleIndex = atoi(sender->Next());
+  int flags = atoi(sender->Next());
+  int value1 = atoi(sender->Next());
+  int value2 = atoi(sender->Next());
+  
+  sender->GetSerial()->println("> SetPWM");
+  const byte msg[] = { CommandSetPWM, moduleIndex, flags, lowByte(value1), highByte(value1), lowByte(value2), highByte(value2) };
+  sendCommMessage(msg, sizeof(msg));  
+}
+
+
+void handlegetSensorsCommand(SerialCommands* sender)
+{
+  if (inLink) return;
+
+  int moduleIndex = atoi(sender->Next());
+  
+  sender->GetSerial()->println("> GetSensors");
+  const byte msg[] = { CommandGetSensors, moduleIndex };
+  sendCommMessage(msg, sizeof(msg));  
+}
+
+
+void handleCommMessage()
+{
+  uint8_t* data = comm.getData();
+  uint8_t length = comm.getLength();
+
+  Serial.print("Raw in: ");
+  byte* ptr = data;
+  for (size_t i = 0; i < length; i++, ptr++)
+  {
+    Serial.print(*ptr, HEX);
+    Serial.print(' ');
+  }
+  Serial.println("");  
+
+  if (length == 0)
+    return;
+
+  uint8_t command = *data; data++; length--;
+  switch (command)
+  {
+    case ResponsePing: 
+      if (length > 0)
+        Serial.println("< Ping response, module index = " + String(*data));
+      else
+        Serial.println("< Ping response, module index = <missing>");
+        
+      break;
+
+    case CommandRequestLink:
+      Serial.println("< Request link");
+      break;
+      
+    case ResponseSetPWM:
+      Serial.println("< Set PWM response, module index = " + String(*data));
+      break;
+
+    case ResponseGetSensors:
+      Serial.println("< Get sensors response, module index = " + String(*data)); data++; length--;
+      if (length >= 2)
+      {
+        Serial.println("  Sensor 1 value: " + String(*reinterpret_cast<uint16_t*>(data))); data+=2; length-=2;
+      }
+      else
+        Serial.println("  Sensor 1 value: <missing>");
+        
+      if (length >= 2)
+      {
+        Serial.println("  Sensor 2 value: " + String(*reinterpret_cast<uint16_t*>(data))); data+=2; length-=2;
+      }
+      else
+        Serial.println("  Sensor 2 value: <missing>");
+        
+      break;
+
+    case ResponseUhmWhat:
+      Serial.println("< Uhm, what? module index = " + String(*data));
+      break;
+  }
+}
+

module/mockmaster/protocol.h

@@ -0,0 +1,155 @@
+/*
+ * Stairs lighting
+ * Copyright 2017 (c) Mark van Renswoude
+ *
+ * https://git.x2software.net/pub/Stairs
+*/
+#ifndef __protocol
+#define __protocol
+
+#include <stdint.h>
+
+
+/*
+ * There are three classes of messages, these masks provide a way to identify
+ * unknown messages if the protocol ever changes.
+ *
+ * MaskBroadcastCommand:  commands which do not expect a response
+ * MaskModuleCommand:     commands which do expect a command. respond with ResponseUhmWhat to satisfy the response requirement.
+ * MaskResponse:          responses to commands
+*/
+const uint8_t MaskMessageType = 0b11000000;
+
+const uint8_t MaskBroadcastCommand = 0b10000000;
+const uint8_t MaskModuleCommand = 0b11000000;
+const uint8_t MaskResponse = 0b01000000;
+
+const uint8_t ResponseUhmWhat = 0x00 | MaskResponse;
+
+
+/*
+ * Ping:
+ *   Aimed at a specific module, which must respond with a
+ *   ResponsePing message.
+ *
+ * Request:
+ *   [0]  CommandPing
+ *   [1]  Module index
+ *
+ * Response:
+ *   [0]  ResponsePing
+ *   [1]  Module index
+*/
+const uint8_t BasePing = 0x01;
+const uint8_t CommandPing = BasePing | MaskModuleCommand;
+const uint8_t ResponsePing = BasePing | MaskResponse;
+
+
+/*
+ * Display module index:
+ *   Broadcast to all modules which should turn on their display
+ *   and show the current settings. No response is expected.
+ *
+ * Request:
+ *   [0]  CommandDisplayModuleIndex
+*/
+const uint8_t CommandDisplayModuleIndex = 0x02 | MaskBroadcastCommand;
+
+
+
+/*
+ * Start linking:
+ *   Broadcast to all modules which should change to link mode.
+ *   During link mode the master will disable all other communication,
+ *   allowing the module to respond at will in response to user input.
+ *
+ *   Each module should send a CommandRequestLink message when user input
+ *   is provided.
+ *
+ * Request:
+ *   [0]  CommandStartLink
+ *
+ * Response (eventually):
+ *   See CommandRequestLink
+*/
+const uint8_t CommandStartLink = 0x10 | MaskBroadcastCommand;
+
+
+/*
+ * Request link:
+ *   Sent by a module when user input is provided to link this module
+ *   as the next in line. All other modules should disable sending this
+ *   message until the currently requesting module receives a response.
+ *
+ *   The master must respond with the new module index, which the
+ *   module must apply and store immediately.
+ *
+ * Request:
+ *   [0]  CommandRequestLink
+ *
+ * Response:
+ *   [0]  ResponseRequestLink
+ *   [1]  New module index
+*/
+const uint8_t BaseRequestLink = 0x11;
+const uint8_t CommandRequestLink = BaseRequestLink | MaskBroadcastCommand;
+const uint8_t ResponseRequestLink = BaseRequestLink | MaskResponse;
+
+
+/*
+ * Stop linking:
+ *   Broadcast to all modules when the master takes back control
+ *   over the communication line. No response is expected.
+ *
+ * Request:
+ *   [0]  CommandStopLink
+*/
+const uint8_t CommandStopLink = 0x12 | MaskBroadcastCommand;
+
+
+/*
+ * Set PWM value:
+ *   Aimed at a specific module, which must apply the specified
+ *   PWM values to the LED strips and respond with a
+ *   ResponseSetPWM message.
+ *
+ * Request:
+ *   [0]    CommandSetPWM
+ *   [1]    Module index
+ *   [2]    Flags, see below
+ *   [3,4]  PWM value for step 1 (0-4095, uint16_t)
+ *   [5,6]  PWM value for step 2 (0-4095, uint16_t)
+ *
+ * Response:
+ *   [0]    ResponseSetPWM
+ *   [1]    Module index
+*/
+const uint8_t BaseSetPWM = 0x20;
+const uint8_t CommandSetPWM = BaseSetPWM | MaskModuleCommand;
+const uint8_t ResponseSetPWM = BaseSetPWM | MaskResponse;
+
+// If included, the on-board verification LEDs should light up with
+// the specified PWM values as well. Otherwise they should be off.
+const uint8_t SetPWMFlagModuleLEDs = 0x01;
+
+
+/*
+ * Get sensor values:
+ *   Aimed at a specific module, which must response with a
+ *   ResponseGetSensors message containing the current sensor states.
+ *
+ * Request:
+ *   [0]    CommandGetSensors
+ *   [1]    Module index
+ *
+ * Response:
+ *   [0]    ResponseGetSensors
+ *   [1]    Module index
+ *   [2]    Analog (0-255) or digital (0, 255) value for sensor 1
+ *   [3]    Analog (0-255) or digital (0, 255) value for sensor 2
+*/
+const uint8_t BaseGetSensors = 0x30;
+const uint8_t CommandGetSensors = BaseGetSensors | MaskModuleCommand;
+const uint8_t ResponseGetSensors = BaseGetSensors | MaskResponse;
+
+#endif

module/platformio.ini

@@ -0,0 +1,24 @@
+; PlatformIO Project Configuration File
+;
+;   Build options: build flags, source filter
+;   Upload options: custom upload port, speed and extra flags
+;   Library options: dependencies, extra library storages
+;   Advanced options: extra scripting
+;
+; Please visit documentation for the other options and examples
+; http://docs.platformio.org/page/projectconf.html
+
+[platformio]
+env_default = board
+
+[env:board]
+platform = atmelavr
+framework = arduino
+board = 328p8m
+board_build.f_cpu = 16000000L
+upload_speed = 115200
+upload_protocol = usbtiny
+
+lib_deps =
+  Adafruit GFX Library
+  Adafruit PWM Servo Driver Library

module/src/config.h

@@ -0,0 +1,50 @@
+/*
+ * Stairs lighting
+ * Copyright 2017 (c) Mark van Renswoude
+ *
+ * https://git.x2software.net/pub/Stairs
+*/
+#ifndef __config
+#define __config
+
+#include <stdint.h>
+
+
+// Baud rate for the RS485 communication
+// At 16 Mhz we pick a baud rate with a very acceptable 0.2% error rate
+// Source: http://www.robotroom.com/Asynchronous-Serial-Communication-2.html
+const uint32_t CommBaudRate = 76800;
+
+// Arduino pin number connected to the MAX485's Receiver and Driver Output Enable pins
+const uint8_t CommWriteEnablePin = 2;
+
+// How long since the last packet before the communication icon shows
+// as 'off'. Note that if a module is not configured for sensors and
+// the light doesn't change either there will be no communication,
+// so no need to panic immediately.
+const uint32_t CommIdleTimeout = 1000;
+
+
+// How long the display should stay on once it's idle and showing the
+// current step numbers.
+const uint32_t DisplayIdleTimeout = 5000;
+
+
+// I2C address of the PCA9685 PWM driver
+const uint8_t PWMDriverAddress = 0x40;
+
+// Frequency of the PCA9685 PWM driver
+const uint16_t PWMDriverFrequency = 1600;
+
+
+// Arduino analog pin number connected to the sensors
+const uint8_t PinSensor1 = 1;
+const uint8_t PinSensor2 = 2;
+
+// Arduino digital pin number connected to the push button.
+const uint8_t PinButton = 8;
+
+// Debounce time for the push button. Since it is not used for fast operations, this can be relatively high.
+const uint32_t ButtonDebounceTime = 500;
+
+#endif

module/src/display.cpp

@@ -0,0 +1,257 @@
+/*
+ * Stairs lighting
+ * Copyright 2017 (c) Mark van Renswoude
+ *
+ * https://git.x2software.net/pub/Stairs
+*/
+#include "display.h"
+#include <Fonts/FreeSans12pt7b.h>
+#include "config.h"
+#include "icons.h"
+#include "global.h"
+
+
+const uint8_t WaitAnimationInterval = 150;
+
+
+void Display::init()
+{
+  mDisplay = new Adafruit_SSD1306(128, 32, &Wire, -1);
+  mDisplay->begin(SSD1306_SWITCHCAPVCC, 0x3C);
+}
+
+
+void Display::update()
+{
+  // TODO invalidate when comm state changes
+
+  switch (state)
+  {
+    case State::WaitingForComm:
+      drawWaitingForComm();
+      break;
+
+    case State::Linking:
+    case State::LinkingRequest:
+      drawLinking();
+      break;
+
+    case State::LinkingSet:
+      drawModuleIndex();
+      break;
+
+    case State::DisplayModuleIndex:
+      if (mLastDrawnState == state && currentTime - mLastStateChange >= DisplayIdleTimeout)
+      {
+        state = State::DisplayOff;
+        off();
+      }
+      else
+        drawModuleIndex();
+
+      break;
+
+    case State::DisplayOff:
+      off();
+      break;
+  }
+
+  setLastDrawnState();
+}
+
+
+void Display::drawWaitingForComm()
+{
+  if (mLastDrawnState == State::WaitingForComm && currentTime - mLastWaiting < WaitAnimationInterval)
+    return;
+
+  checkOn();
+  mDisplay->clearDisplay();
+  drawTitle("Waiting for signal");
+
+  uint8_t xOffset = (mWaitAnimationStep == 1 || mWaitAnimationStep == 2) ? WaitCursorSegmentWidth : 0;
+  uint8_t yOffset = (mWaitAnimationStep == 2 || mWaitAnimationStep == 3) ? WaitCursorSegmentHeight : 0;
+  drawRotatedBitmap(xOffset, mDisplay->height() - (WaitCursorSegmentHeight * 2) + yOffset, WaitCursorSegment, WaitCursorSegmentWidth, WaitCursorSegmentHeight, mWaitAnimationStep);
+
+  mDisplay->display();
+
+  mWaitAnimationStep++;
+  if (mWaitAnimationStep > 3)
+    mWaitAnimationStep = 0;
+
+  mLastWaiting = currentTime;
+}
+
+
+void Display::drawModuleIndex()
+{
+  uint8_t moduleIndex = settings.getModuleIndex();
+  if (mLastDrawnState == State::DisplayModuleIndex && mLastModuleIndex == moduleIndex)
+    return;
+
+  checkOn();
+  mDisplay->clearDisplay();
+  drawTitle("Steps");
+  drawCommIcon();
+
+  mDisplay->setFont(&FreeSans12pt7b);
+  mDisplay->setCursor(0, mDisplay->height() - 1);
+
+  if (moduleIndex == ModuleIndexUndefined)
+  {
+    mDisplay->print("Not set");
+  }
+  else
+  {
+    uint8_t firstStep = (moduleIndex * 2) + 1;
+    mDisplay->print(firstStep);
+    mDisplay->print(" - ");
+    mDisplay->print(firstStep + 1);
+  }
+
+  mDisplay->display();
+}
+
+
+void Display::drawLinking()
+{
+  if (mLastDrawnState == State::Linking)
+    return;
+
+  checkOn();
+  mDisplay->clearDisplay();
+  drawTitle("Steps");
+  drawCommIcon();
+
+  mDisplay->setFont(&FreeSans12pt7b);
+  mDisplay->setCursor(0, mDisplay->height() - 1);
+  mDisplay->print("Click to set");
+  mDisplay->display();
+}
+
+
+void Display::setLastDrawnState()
+{
+  if (state != mLastDrawnState)
+  {
+    mLastDrawnState = state;
+    mLastStateChange = currentTime;
+  }
+}
+
+
+void Display::off()
+{
+  if (mLastDrawnState != State::DisplayOff)
+  {
+    // I've had trouble waking the display up again, so just clear it for now
+    mDisplay->ssd1306_command(SSD1306_DISPLAYOFF);
+    mDisplay->ssd1306_command(SSD1306_CHARGEPUMP);
+    mDisplay->ssd1306_command(0x10); // disable charge pump
+    //mDisplay->clearDisplay();
+    //mDisplay->display();
+  }
+}
+
+
+void Display::checkOn()
+{
+  if (mLastDrawnState == State::DisplayOff)
+  {
+    mDisplay->ssd1306_command(SSD1306_CHARGEPUMP);
+    mDisplay->ssd1306_command(0x14); // enable charge pump
+
+    mDisplay->ssd1306_command(SSD1306_DISPLAYON);
+  }
+}
+
+
+void Display::drawTitle(const char* title)
+{
+  mDisplay->setTextSize(1);
+  mDisplay->setTextColor(WHITE);
+
+  mDisplay->setFont(NULL);
+  mDisplay->setCursor(0, 0);
+  mDisplay->print(title);
+}
+
+
+void Display::drawCommIcon()
+{
+  mDisplay->drawBitmap(mDisplay->width() - IconCommWidth, 0,
+    currentTime - comm.getPacketStartTime() <= CommIdleTimeout ? IconCommOn : IconCommOff,
+    IconCommWidth, IconCommHeight, 1);
+}
+
+
+
+typedef void (*WritePixelProc)(Adafruit_SSD1306* display, int8_t boundsX, int8_t boundsY, int8_t boundsW, int8_t boundsH, int8_t relativeX, int8_t relativeY);
+
+
+void writePixel0(Adafruit_SSD1306* display, int8_t boundsX, int8_t boundsY, int8_t boundsW, int8_t boundsH, int8_t relativeX, int8_t relativeY)
+{
+  display->writePixel(boundsX + relativeX, boundsY + relativeY, 1);
+}
+
+void writePixel90(Adafruit_SSD1306* display, int8_t boundsX, int8_t boundsY, int8_t boundsW, int8_t boundsH, int8_t relativeX, int8_t relativeY)
+{
+  display->writePixel(boundsX + boundsW - relativeY, boundsY + relativeX, 1);
+}
+
+void writePixel180(Adafruit_SSD1306* display, int8_t boundsX, int8_t boundsY, int8_t boundsW, int8_t boundsH, int8_t relativeX, int8_t relativeY)
+{
+  display->writePixel(boundsX + boundsW - relativeX, boundsY + boundsH - relativeY, 1);
+}
+
+void writePixel270(Adafruit_SSD1306* display, int8_t boundsX, int8_t boundsY, int8_t boundsW, int8_t boundsH, int8_t relativeX, int8_t relativeY)
+{
+  display->writePixel(boundsX + relativeY, boundsY + boundsH - relativeX, 1);
+}
+
+
+void Display::drawRotatedBitmap(int8_t x, int8_t y, const uint8_t bitmap[], int8_t w, int8_t h, uint8_t rotation)
+{
+  int16_t byteWidth = (w + 7) / 8;
+  int8_t byte = 0;
+
+  mDisplay->startWrite();
+
+  WritePixelProc writePixel;
+  switch (rotation)
+  {
+    case 1: // 90 degrees
+      writePixel = writePixel90;
+      break;
+
+    case 2: // 180 degrees
+      writePixel = writePixel180;
+      break;
+
+    case 3: // 270 degrees
+      writePixel = writePixel270;
+      break;
+
+    default: // 0 degrees
+      writePixel = writePixel0;
+      break;
+  }
+
+  for(int8_t relativeY = 0; relativeY < h; relativeY++)
+  {
+    for(int8_t relativeX = 0; relativeX < w; relativeX++)
+    {
+      if(relativeX & 7)
+        byte <<= 1;
+      else
+        byte   = pgm_read_byte(&bitmap[relativeY * byteWidth + relativeX / 8]);
+
+      if (byte & 0x80)
+        writePixel(mDisplay, x, y, w, h, relativeX, relativeY);
+    }
+  }
+
+  mDisplay->endWrite();
+}
+
+

module/src/display.h

@@ -0,0 +1,44 @@
+/*
+ * Stairs lighting
+ * Copyright 2017 (c) Mark van Renswoude
+ *
+ * https://git.x2software.net/pub/Stairs
+*/
+#ifndef __display
+#define __display
+
+#include <Arduino.h>
+#include <Wire.h>
+#include <Adafruit_GFX.h>
+#include "lib/Adafruit_SSD1306.h"
+#include "state.h"
+
+
+class Display
+{
+  private:
+    Adafruit_SSD1306* mDisplay;
+    State mLastDrawnState = State::DisplayOff;
+    uint32_t mLastStateChange;
+    uint8_t mLastModuleIndex;
+    uint32_t mLastWaiting;
+    uint8_t mWaitAnimationStep = 0;
+
+    void drawRotatedBitmap(int8_t x, int8_t y, const uint8_t bitmap[], int8_t w, int8_t h, uint8_t rotation);
+
+    void checkOn();
+    void drawTitle(const char* title);
+    void drawCommIcon();
+
+    void drawWaitingForComm();
+    void drawModuleIndex();
+    void drawLinking();
+    void off();
+
+    void setLastDrawnState();
+  public:
+    void init();
+    void update();
+};
+
+#endif

module/src/global.cpp

@@ -0,0 +1,32 @@
+/*
+ * Stairs lighting
+ * Copyright 2017 (c) Mark van Renswoude
+ *
+ * https://git.x2software.net/pub/Stairs
+*/
+#include "global.h"
+#include "config.h"
+
+
+int serialRead()
+{
+  return Serial.read();
+}
+
+int serialAvailable()
+{
+  return Serial.available();
+}
+
+size_t serialWrite(const byte what)
+{
+  return Serial.write(what);
+}
+
+
+Settings settings;
+Display display;
+RS485 comm(serialRead, serialAvailable, serialWrite, 20);
+Adafruit_PWMServoDriver pwmDriver(PWMDriverAddress);
+State state = State::WaitingForComm;
+uint32_t currentTime;

module/src/global.h

@@ -0,0 +1,23 @@
+/*
+ * Stairs lighting
+ * Copyright 2017 (c) Mark van Renswoude
+ *
+ * https://git.x2software.net/pub/Stairs
+*/
+#ifndef __global
+#define __global
+
+#include "lib/RS485_non_blocking.h"
+#include "Adafruit_PWMServoDriver.h"
+#include "settings.h"
+#include "display.h"
+#include "state.h"
+
+extern Settings settings;
+extern Display display;
+extern RS485 comm;
+extern Adafruit_PWMServoDriver pwmDriver;
+extern State state;
+extern uint32_t currentTime;
+
+#endif

module/src/icons.h

@@ -0,0 +1,28 @@
+/*
+ * Stairs lighting
+ * Copyright 2017 (c) Mark van Renswoude
+ *
+ * https://git.x2software.net/pub/Stairs
+*/
+
+// http://javl.github.io/image2cpp/
+// Draw mode: horizontal
+const uint8_t IconCommWidth = 12;
+const uint8_t IconCommHeight = 8;
+
+const uint8_t PROGMEM IconCommOff[] = {
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x06, 0x00, 0x06, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
+};
+
+const uint8_t PROGMEM IconCommOn[] = {
+  0x40, 0x20, 0x40, 0x20, 0x90, 0x90, 0xa6, 0x50, 0xa6, 0x50, 0x90, 0x90, 0x40, 0x20, 0x40, 0x20
+};
+
+
+const uint8_t WaitCursorSegmentWidth = 10;
+const uint8_t WaitCursorSegmentHeight = 10;
+
+const uint8_t PROGMEM WaitCursorSegment[] = {
+  0x07, 0x80, 0x1f, 0x80, 0x3e, 0x00, 0x78, 0x00, 0x70, 0x00, 0xe0, 0x00, 0xe0, 0x00, 0xc0, 0x00,
+  0xc0, 0x00, 0x00, 0x00
+};

module/src/lib/Adafruit_SSD1306.h

@@ -0,0 +1,185 @@
+/*!
+ * @file Adafruit_SSD1306.h
+ *
+ * This is part of for Adafruit's SSD1306 library for monochrome
+ * OLED displays: http://www.adafruit.com/category/63_98
+ *
+ * These displays use I2C or SPI to communicate. I2C requires 2 pins
+ * (SCL+SDA) and optionally a RESET pin. SPI requires 4 pins (MOSI, SCK,
+ * select, data/command) and optionally a reset pin. Hardware SPI or
+ * 'bitbang' software SPI are both supported.
+ *
+ * Adafruit invests time and resources providing this open source code,
+ * please support Adafruit and open-source hardware by purchasing
+ * products from Adafruit!
+ *
+ * Written by Limor Fried/Ladyada for Adafruit Industries, with
+ * contributions from the open source community.
+ *
+ * BSD license, all text above, and the splash screen header file,
+ * must be included in any redistribution.
+ *
+ */
+
+/*
+  Modifications for Stairs project:
+  - Removed the Adafruit splash screen. I'm not going to show it anyways, so all it
+    does is take up valuable program space.
+*/
+
+#ifndef _Adafruit_SSD1306_H_
+#define _Adafruit_SSD1306_H_
+
+// ONE of the following three lines must be #defined:
+//#define SSD1306_128_64 ///< DEPRECTAED: old way to specify 128x64 screen
+#define SSD1306_128_32   ///< DEPRECATED: old way to specify 128x32 screen
+//#define SSD1306_96_16  ///< DEPRECATED: old way to specify 96x16 screen
+// This establishes the screen dimensions in old Adafruit_SSD1306 sketches
+// (NEW CODE SHOULD IGNORE THIS, USE THE CONSTRUCTORS THAT ACCEPT WIDTH
+// AND HEIGHT ARGUMENTS).
+
+#if defined(ARDUINO_STM32_FEATHER)
+  typedef class HardwareSPI SPIClass;
+#endif
+
+#include <Wire.h>
+#include <SPI.h>
+#include <Adafruit_GFX.h>
+
+#if defined(__AVR__)
+  typedef volatile uint8_t  PortReg;
+  typedef uint8_t           PortMask;
+  #define HAVE_PORTREG
+#elif defined(__SAM3X8E__)
+  typedef volatile RwReg    PortReg;
+  typedef uint32_t          PortMask;
+  #define HAVE_PORTREG
+#elif defined(__arm__) || defined(ARDUINO_FEATHER52)
+  typedef volatile uint32_t PortReg;
+  typedef uint32_t          PortMask;
+  #define HAVE_PORTREG
+#endif
+
+#define BLACK                          0 ///< Draw 'off' pixels
+#define WHITE                          1 ///< Draw 'on' pixels
+#define INVERSE                        2 ///< Invert pixels
+
+#define SSD1306_MEMORYMODE          0x20 ///< See datasheet
+#define SSD1306_COLUMNADDR          0x21 ///< See datasheet
+#define SSD1306_PAGEADDR            0x22 ///< See datasheet
+#define SSD1306_SETCONTRAST         0x81 ///< See datasheet
+#define SSD1306_CHARGEPUMP          0x8D ///< See datasheet
+#define SSD1306_SEGREMAP            0xA0 ///< See datasheet
+#define SSD1306_DISPLAYALLON_RESUME 0xA4 ///< See datasheet
+#define SSD1306_DISPLAYALLON        0xA5 ///< Not currently used
+#define SSD1306_NORMALDISPLAY       0xA6 ///< See datasheet
+#define SSD1306_INVERTDISPLAY       0xA7 ///< See datasheet
+#define SSD1306_SETMULTIPLEX        0xA8 ///< See datasheet
+#define SSD1306_DISPLAYOFF          0xAE ///< See datasheet
+#define SSD1306_DISPLAYON           0xAF ///< See datasheet
+#define SSD1306_COMSCANINC          0xC0 ///< Not currently used
+#define SSD1306_COMSCANDEC          0xC8 ///< See datasheet
+#define SSD1306_SETDISPLAYOFFSET    0xD3 ///< See datasheet
+#define SSD1306_SETDISPLAYCLOCKDIV  0xD5 ///< See datasheet
+#define SSD1306_SETPRECHARGE        0xD9 ///< See datasheet
+#define SSD1306_SETCOMPINS          0xDA ///< See datasheet
+#define SSD1306_SETVCOMDETECT       0xDB ///< See datasheet
+
+#define SSD1306_SETLOWCOLUMN        0x00 ///< Not currently used
+#define SSD1306_SETHIGHCOLUMN       0x10 ///< Not currently used
+#define SSD1306_SETSTARTLINE        0x40 ///< See datasheet
+
+#define SSD1306_EXTERNALVCC         0x01 ///< External display voltage source
+#define SSD1306_SWITCHCAPVCC        0x02 ///< Gen. display voltage from 3.3V
+
+#define SSD1306_RIGHT_HORIZONTAL_SCROLL              0x26 ///< Init rt scroll
+#define SSD1306_LEFT_HORIZONTAL_SCROLL               0x27 ///< Init left scroll
+#define SSD1306_VERTICAL_AND_RIGHT_HORIZONTAL_SCROLL 0x29 ///< Init diag scroll
+#define SSD1306_VERTICAL_AND_LEFT_HORIZONTAL_SCROLL  0x2A ///< Init diag scroll
+#define SSD1306_DEACTIVATE_SCROLL                    0x2E ///< Stop scroll
+#define SSD1306_ACTIVATE_SCROLL                      0x2F ///< Start scroll
+#define SSD1306_SET_VERTICAL_SCROLL_AREA             0xA3 ///< Set scroll range
+
+// Deprecated size stuff for backwards compatibility with old sketches
+#if defined SSD1306_128_64
+ #define SSD1306_LCDWIDTH  128 ///< DEPRECATED: width w/SSD1306_128_64 defined
+ #define SSD1306_LCDHEIGHT  64 ///< DEPRECATED: height w/SSD1306_128_64 defined
+#endif
+#if defined SSD1306_128_32
+ #define SSD1306_LCDWIDTH  128 ///< DEPRECATED: width w/SSD1306_128_32 defined
+ #define SSD1306_LCDHEIGHT  32 ///< DEPRECATED: height w/SSD1306_128_32 defined
+#endif
+#if defined SSD1306_96_16
+ #define SSD1306_LCDWIDTH   96 ///< DEPRECATED: width w/SSD1306_96_16 defined
+ #define SSD1306_LCDHEIGHT  16 ///< DEPRECATED: height w/SSD1306_96_16 defined
+#endif
+
+/*!
+    @brief  Class that stores state and functions for interacting with
+            SSD1306 OLED displays.
+*/
+class Adafruit_SSD1306 : public Adafruit_GFX {
+ public:
+  // NEW CONSTRUCTORS -- recommended for new projects
+  Adafruit_SSD1306(uint8_t w, uint8_t h, TwoWire *twi=&Wire, int8_t rst_pin=-1,
+    uint32_t clkDuring=400000UL, uint32_t clkAfter=100000UL);
+  Adafruit_SSD1306(uint8_t w, uint8_t h, int8_t mosi_pin, int8_t sclk_pin,
+    int8_t dc_pin, int8_t rst_pin, int8_t cs_pin);
+  Adafruit_SSD1306(uint8_t w, uint8_t h, SPIClass *spi,
+    int8_t dc_pin, int8_t rst_pin, int8_t cs_pin, uint32_t bitrate=8000000UL);
+
+  // DEPRECATED CONSTRUCTORS - for back compatibility, avoid in new projects
+  Adafruit_SSD1306(int8_t mosi_pin, int8_t sclk_pin, int8_t dc_pin,
+    int8_t rst_pin, int8_t cs_pin);
+  Adafruit_SSD1306(int8_t dc_pin, int8_t rst_pin, int8_t cs_pin);
+  Adafruit_SSD1306(int8_t rst_pin = -1);
+
+  ~Adafruit_SSD1306(void);
+
+  boolean      begin(uint8_t switchvcc=SSD1306_SWITCHCAPVCC,
+                 uint8_t i2caddr=0, boolean reset=true,
+                 boolean periphBegin=true);
+  void         display(void);
+  void         clearDisplay(void);
+  void         invertDisplay(boolean i);
+  void         dim(boolean dim);
+  void         drawPixel(int16_t x, int16_t y, uint16_t color);
+  virtual void drawFastHLine(int16_t x, int16_t y, int16_t w, uint16_t color);
+  virtual void drawFastVLine(int16_t x, int16_t y, int16_t h, uint16_t color);
+  void         startscrollright(uint8_t start, uint8_t stop);
+  void         startscrollleft(uint8_t start, uint8_t stop);
+  void         startscrolldiagright(uint8_t start, uint8_t stop);
+  void         startscrolldiagleft(uint8_t start, uint8_t stop);
+  void         stopscroll(void);
+  void         ssd1306_command(uint8_t c);
+  boolean      getPixel(int16_t x, int16_t y);
+  uint8_t     *getBuffer(void);
+
+ private:
+  inline void  SPIwrite(uint8_t d) __attribute__((always_inline));
+  void         drawFastHLineInternal(int16_t x, int16_t y, int16_t w,
+                 uint16_t color);
+  void         drawFastVLineInternal(int16_t x, int16_t y, int16_t h,
+                 uint16_t color);
+  void         ssd1306_command1(uint8_t c);
+  void         ssd1306_commandList(const uint8_t *c, uint8_t n);
+
+  SPIClass    *spi;
+  TwoWire     *wire;
+  uint8_t     *buffer;
+  int8_t       i2caddr, vccstate, page_end;
+  int8_t       mosiPin    ,  clkPin    ,  dcPin    ,  csPin, rstPin;
+#ifdef HAVE_PORTREG
+  PortReg     *mosiPort   , *clkPort   , *dcPort   , *csPort;
+  PortMask     mosiPinMask,  clkPinMask,  dcPinMask,  csPinMask;
+#endif
+#if defined(SPI_HAS_TRANSACTION)
+  SPISettings  spiSettings;
+#endif
+#if ARDUINO >= 157
+  uint32_t     wireClk;    // Wire speed for SSD1306 transfers
+  uint32_t     restoreClk; // Wire speed following SSD1306 transfers
+#endif
+};
+
+#endif // _Adafruit_SSD1306_H_

module/src/lib/RS485_non_blocking.cpp

@@ -0,0 +1,232 @@
+/*
+ RS485 protocol library - non-blocking.
+
+ Devised and written by Nick Gammon.
+ Date: 4 December 2012
+ Version: 1.0
+
+ Can send from 1 to 255 bytes from one node to another with:
+
+ * Packet start indicator (STX)
+ * Each data byte is doubled and inverted to check validity
+ * Packet end indicator (ETX)
+ * Packet CRC (checksum)
+
+
+ To allow flexibility with hardware (eg. Serial, SoftwareSerial, I2C)
+ you provide three "callback" functions which send or receive data. Examples are:
+
+ size_t fWrite (const byte what)
+   {
+   return Serial.write (what);
+   }
+
+ int fAvailable ()
+   {
+   return Serial.available ();
+   }
+
+ int fRead ()
+   {
+   return Serial.read ();
+   }
+
+
+ PERMISSION TO DISTRIBUTE
+
+ Permission is hereby granted, free of charge, to any person obtaining a copy of this software
+ and associated documentation files (the "Software"), to deal in the Software without restriction,
+ including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so,
+ subject to the following conditions:
+
+ The above copyright notice and this permission notice shall be included in
+ all copies or substantial portions of the Software.
+
+
+ LIMITATION OF LIABILITY
+
+ The software is provided "as is", without warranty of any kind, express or implied,
+ including but not limited to the warranties of merchantability, fitness for a particular
+ purpose and noninfringement. In no event shall the authors or copyright holders be liable
+ for any claim, damages or other liability, whether in an action of contract,
+ tort or otherwise, arising from, out of or in connection with the software
+ or the use or other dealings in the software.
+
+ */
+
+#include "RS485_non_blocking.h"
+
+// allocate the requested buffer size
+void RS485::begin ()
+  {
+  data_ = (byte *) malloc (bufferSize_);
+  reset ();
+  errorCount_ = 0;
+  } // end of RS485::begin
+
+// get rid of the buffer
+void RS485::stop ()
+{
+  reset ();
+  free (data_);
+  data_ = NULL;
+} // end of RS485::stop
+
+// called after an error to return to "not in a packet"
+void RS485::reset ()
+  {
+  haveSTX_ = false;
+  available_ = false;
+  inputPos_ = 0;
+  startTime_ = 0;
+  } // end of RS485::reset
+
+// calculate 8-bit CRC
+byte RS485::crc8 (const byte *addr, byte len)
+{
+  byte crc = 0;
+  while (len--)
+    {
+    byte inbyte = *addr++;
+    for (byte i = 8; i; i--)
+      {
+      byte mix = (crc ^ inbyte) & 0x01;
+      crc >>= 1;
+      if (mix)
+        crc ^= 0x8C;
+      inbyte >>= 1;
+      }  // end of for
+    }  // end of while
+  return crc;
+}  // end of RS485::crc8
+
+// send a byte complemented, repeated
+// only values sent would be (in hex):
+//   0F, 1E, 2D, 3C, 4B, 5A, 69, 78, 87, 96, A5, B4, C3, D2, E1, F0
+void RS485::sendComplemented (const byte what)
+{
+byte c;
+
+  // first nibble
+  c = what >> 4;
+  fWriteCallback_ ((c << 4) | (c ^ 0x0F));
+
+  // second nibble
+  c = what & 0x0F;
+  fWriteCallback_ ((c << 4) | (c ^ 0x0F));
+
+}  // end of RS485::sendComplemented
+
+// send a message of "length" bytes (max 255) to other end
+// put STX at start, ETX at end, and add CRC
+void RS485::sendMsg (const byte * data, const byte length)
+{
+  // no callback? Can't send
+  if (fWriteCallback_ == NULL)
+    return;
+
+  fWriteCallback_ (STX);  // STX
+  for (byte i = 0; i < length; i++)
+    sendComplemented (data [i]);
+  fWriteCallback_ (ETX);  // ETX
+  sendComplemented (crc8 (data, length));
+}  // end of RS485::sendMsg
+
+// called periodically from main loop to process data and
+// assemble the finished packet in 'data_'
+
+// returns true if packet received.
+
+// You could implement a timeout by seeing if isPacketStarted() returns
+// true, and if too much time has passed since getPacketStartTime() time.
+
+bool RS485::update ()
+  {
+  // no data? can't go ahead (eg. begin() not called)
+  if (data_ == NULL)
+    return false;
+
+  // no callbacks? Can't read
+  if (fAvailableCallback_ == NULL || fReadCallback_ == NULL)
+    return false;
+
+  while (fAvailableCallback_ () > 0)
+    {
+    byte inByte = fReadCallback_ ();
+
+    switch (inByte)
+      {
+
+        case STX:   // start of text
+          haveSTX_ = true;
+          haveETX_ = false;
+          inputPos_ = 0;
+          firstNibble_ = true;
+          startTime_ = millis ();
+          break;
+
+        case ETX:   // end of text (now expect the CRC check)
+          haveETX_ = true;
+          break;
+
+        default:
+          // wait until packet officially starts
+          if (!haveSTX_)
+            break;
+
+          // check byte is in valid form (4 bits followed by 4 bits complemented)
+          if ((inByte >> 4) != ((inByte & 0x0F) ^ 0x0F) )
+            {
+            reset ();
+            errorCount_++;
+            break;  // bad character
+            } // end if bad byte
+
+          // convert back
+          inByte >>= 4;
+
+          // high-order nibble?
+          if (firstNibble_)
+            {
+            currentByte_ = inByte;
+            firstNibble_ = false;
+            break;
+            }  // end of first nibble
+
+          // low-order nibble
+          currentByte_ <<= 4;
+          currentByte_ |= inByte;
+          firstNibble_ = true;
+
+          // if we have the ETX this must be the CRC
+          if (haveETX_)
+            {
+            if (crc8 (data_, inputPos_) != currentByte_)
+              {
+              reset ();
+              errorCount_++;
+              break;  // bad crc
+              } // end of bad CRC
+
+            available_ = true;
+            return true;  // show data ready
+            }  // end if have ETX already
+
+          // keep adding if not full
+          if (inputPos_ < bufferSize_)
+            data_ [inputPos_++] = currentByte_;
+          else
+            {
+            reset (); // overflow, start again
+            errorCount_++;
+            }
+
+          break;
+
+      }  // end of switch
+    }  // end of while incoming data
+
+  return false;  // not ready yet
+  } // end of RS485::update
+

module/src/lib/RS485_non_blocking.h

@@ -0,0 +1,107 @@
+/*
+ RS485 protocol library - non-blocking.
+
+ Devised and written by Nick Gammon.
+ Date: 4 December 2012
+ Version: 1.0
+
+ Licence: Released for public use.
+
+*/
+
+#include "Arduino.h"
+
+
+class RS485
+  {
+
+  typedef size_t (*WriteCallback)  (const byte what);    // send a byte to serial port
+  typedef int  (*AvailableCallback)  ();    // return number of bytes available
+  typedef int  (*ReadCallback)  ();    // read a byte from serial port
+
+  enum {
+        STX = '\2',   // start of text
+        ETX = '\3'    // end of text
+  };  // end of enum
+
+  // callback functions to do reading/writing
+  ReadCallback fReadCallback_;
+  AvailableCallback fAvailableCallback_;
+  WriteCallback fWriteCallback_;
+
+  // where we save incoming stuff
+  byte * data_;
+
+  // how much data is in the buffer
+  const int bufferSize_;
+
+  // this is true once we have valid data in buf
+  bool available_;
+
+  // an STX (start of text) signals a packet start
+  bool haveSTX_;
+
+  // count of errors
+  unsigned long errorCount_;
+
+  // variables below are set when we get an STX
+  bool haveETX_;
+  byte inputPos_;
+  byte currentByte_;
+  bool firstNibble_;
+  unsigned long startTime_;
+
+  // helper private functions
+  byte crc8 (const byte *addr, byte len);
+  void sendComplemented (const byte what);
+
+  public:
+
+    // constructor
+    RS485 (ReadCallback fReadCallback,
+           AvailableCallback fAvailableCallback,
+           WriteCallback fWriteCallback,
+           const byte bufferSize) :
+        fReadCallback_ (fReadCallback),
+        fAvailableCallback_ (fAvailableCallback),
+        fWriteCallback_ (fWriteCallback),
+        data_ (NULL),
+        bufferSize_ (bufferSize)
+         {}
+
+    // destructor - frees memory used
+    ~RS485 () { stop (); }
+
+    // allocate memory for buf_
+    void begin ();
+
+    // free memory in buf_
+    void stop ();
+
+    // handle incoming data, return true if packet ready
+    bool update ();
+
+    // reset to no incoming data (eg. after a timeout)
+    void reset ();
+
+    // send data
+    void sendMsg (const byte * data, const byte length);
+
+    // returns true if packet available
+    bool available () const { return available_; };
+
+    // once available, returns the address of the current message
+    byte * getData ()   const { return data_; }
+    byte   getLength () const { return inputPos_; }
+
+    // return how many errors we have had
+    unsigned long getErrorCount () const { return errorCount_; }
+
+    // return when last packet started
+    unsigned long getPacketStartTime () const { return startTime_; }
+
+    // return true if a packet has started to be received
+    bool isPacketStarted () const { return haveSTX_; }
+
+  }; // end of class RS485
+

module/src/main.cpp

@@ -0,0 +1,226 @@
+/*
+ * Stairs lighting
+ * Copyright 2017 (c) Mark van Renswoude
+ *
+ * https://git.x2software.net/pub/Stairs
+*/
+#include <Arduino.h>
+#include <Wire.h>
+#include "global.h"
+#include "config.h"
+#include "display.h"
+#include "protocol.h"
+
+
+void setup()
+{
+  settings.init();
+
+  // Set up I2C devices: the SSD1306 OLED display and PCA9685 LED PWM driver
+  Wire.begin();
+  display.init();
+
+  pwmDriver.begin();
+  pwmDriver.setPWMFreq(PWMDriverFrequency);
+
+  // At 16 Mhz we pick a baud rate with a very acceptable 0.2% error rate
+  // Source: http://www.robotroom.com/Asynchronous-Serial-Communication-2.html
+  Serial.begin(CommBaudRate);
+  pinMode(CommWriteEnablePin, OUTPUT);
+  comm.begin();
+
+  pinMode(PinButton, INPUT_PULLUP);
+
+  pinMode(5, OUTPUT);
+}
+
+
+
+// Forward declarations
+void handleCommMessage();
+void handlePing(uint8_t* data, uint8_t length);
+void handleDisplayModuleIndex(uint8_t* data, uint8_t length);
+void handleStartLink(uint8_t* data, uint8_t length);
+void handleRequestLinkResponse(uint8_t* data, uint8_t length);
+void handleStopLink(uint8_t* data, uint8_t length);
+void handleSetPWM(uint8_t* data, uint8_t length);
+void handleGetSensors(uint8_t* data, uint8_t length);
+
+void checkButtonPress();
+
+
+void loop()
+{
+  currentTime = millis();
+
+  if (comm.update())
+    handleCommMessage();
+
+  checkButtonPress();
+  display.update();
+}
+
+
+
+void sendCommMessage(const uint8_t* data, uint8_t size)
+{
+  digitalWrite(CommWriteEnablePin, HIGH);
+  comm.sendMsg(data, size);
+
+
+  // Wait for the hardware buffer to clear before turning
+  // off the write enable pin, or we'll cut off the message too early
+  // Straight from: http://www.gammon.com.au/forum/?id=11428
+
+  while (!(UCSR0A & (1 << UDRE0)))  // Wait for empty transmit buffer
+    UCSR0A |= 1 << TXC0;  // mark transmission not complete
+
+  while (!(UCSR0A & (1 << TXC0)));   // Wait for the transmission to complete
+
+
+  digitalWrite(CommWriteEnablePin, LOW);
+}
+
+
+void handleCommMessage()
+{
+  uint8_t* data = comm.getData();
+  uint8_t length = comm.getLength();
+
+  if (length == 0)
+    return;
+
+  if (state == State::WaitingForComm)
+    state = State::DisplayModuleIndex;
+
+  uint8_t command = *data; data++; length--;
+  uint8_t moduleIndex = ModuleIndexUndefined;
+
+  if ((command & MaskMessageType) == MaskModuleCommand)
+  {
+    if (!settings.hasModuleIndex())
+      // We're not linked yet
+      return;
+
+    moduleIndex = *data; data++; length--;
+
+    if (settings.getModuleIndex() != moduleIndex)
+      // This message is meant for another module
+      return;
+  }
+
+  switch (command)
+  {
+    case CommandPing: handlePing(data, length); break;
+    case CommandDisplayModuleIndex: handleDisplayModuleIndex(data, length); break;
+    case CommandStartLink: handleStartLink(data, length); break;
+    case ResponseRequestLink: handleRequestLinkResponse(data, length); break;
+    case CommandStopLink: handleStopLink(data, length); break;
+    case CommandSetPWM: handleSetPWM(data, length); break;
+    case CommandGetSensors: handleGetSensors(data, length); break;
+
+    default:
+      if ((command & MaskMessageType) == MaskModuleCommand)
+      {
+        // Sender expects a response from us
+        const uint8_t msg[] = { ResponseUhmWhat, moduleIndex };
+        sendCommMessage(msg, sizeof(msg));
+      }
+  }
+}
+
+
+void handlePing(uint8_t* data, uint8_t length)
+{
+  const uint8_t msg[] = { ResponsePing, settings.getModuleIndex() };
+  sendCommMessage(msg, sizeof(msg));
+}
+
+
+void handleDisplayModuleIndex(uint8_t* data, uint8_t length)
+{
+  if (state == State::DisplayOff)
+    state = State::DisplayModuleIndex;
+}
+
+
+void handleStartLink(uint8_t* data, uint8_t length)
+{
+  state = State::Linking;
+}
+
+
+void handleRequestLinkResponse(uint8_t* data, uint8_t length)
+{
+  if (length == 0)
+    return;
+
+  if (state != State::LinkingRequest)
+    return;
+
+  settings.setModuleIndex(*data);
+  state = State::LinkingSet;
+}
+
+
+void handleStopLink(uint8_t* data, uint8_t length)
+{
+  if (state == State::Linking || state == State::LinkingRequest || state == State::LinkingSet)
+    state = State::DisplayModuleIndex;
+}
+
+
+void handleSetPWM(uint8_t* data, uint8_t length)
+{
+  if (length < 5)
+    return;
+
+  uint8_t flags = *data; data++;
+  uint16_t value1 = *(reinterpret_cast<uint16_t*>(data)); data += 2;
+  uint16_t value2 = *(reinterpret_cast<uint16_t*>(data)); data += 2;
+
+  pwmDriver.setPin(0, value1);
+  pwmDriver.setPin(1, value2);
+
+  if ((flags & SetPWMFlagModuleLEDs) == SetPWMFlagModuleLEDs)
+  {
+    pwmDriver.setPin(2, value1);
+    pwmDriver.setPin(3, value2);
+  }
+  else
+  {
+    pwmDriver.setPin(2, 0);
+    pwmDriver.setPin(3, 0);
+  }
+
+  const uint8_t msg[] = { ResponseSetPWM, settings.getModuleIndex() };
+  sendCommMessage(msg, sizeof(msg));
+}
+
+
+void handleGetSensors(uint8_t* data, uint8_t length)
+{
+  uint16_t value1 = analogRead(PinSensor1);
+  uint16_t value2 = analogRead(PinSensor2);
+
+  const uint8_t msg[] = { ResponseGetSensors, settings.getModuleIndex(), lowByte(value1), highByte(value1), lowByte(value2), highByte(value2) };
+  sendCommMessage(msg, sizeof(msg));
+}
+
+
+uint32_t lastButtonPress = 0;
+
+void checkButtonPress()
+{
+  if ((state == State::Linking || state == State::LinkingRequest) &&
+      digitalRead(PinButton) == HIGH &&
+      currentTime - lastButtonPress >= ButtonDebounceTime)
+  {
+    state = State::LinkingRequest;
+
+    const uint8_t msg[] = { CommandRequestLink };
+    sendCommMessage(msg, sizeof(msg));
+
+    lastButtonPress = currentTime;
+  }
+}

module/src/protocol.h

@@ -0,0 +1,155 @@
+/*
+ * Stairs lighting
+ * Copyright 2017 (c) Mark van Renswoude
+ *
+ * https://git.x2software.net/pub/Stairs
+*/
+#ifndef __protocol
+#define __protocol
+
+#include <stdint.h>
+
+
+/*
+ * There are three classes of messages, these masks provide a way to identify
+ * unknown messages if the protocol ever changes.
+ *
+ * MaskBroadcastCommand:  commands which do not expect a response
+ * MaskModuleCommand:     commands which do expect a command. respond with ResponseUhmWhat to satisfy the response requirement.
+ * MaskResponse:          responses to commands
+*/
+const uint8_t MaskMessageType = 0b11000000;
+
+const uint8_t MaskBroadcastCommand = 0b10000000;
+const uint8_t MaskModuleCommand = 0b11000000;
+const uint8_t MaskResponse = 0b01000000;
+
+const uint8_t ResponseUhmWhat = 0x00 | MaskResponse;
+
+
+/*
+ * Ping:
+ *   Aimed at a specific module, which must respond with a
+ *   ResponsePing message.
+ *
+ * Request:
+ *   [0]  CommandPing
+ *   [1]  Module index
+ *
+ * Response:
+ *   [0]  ResponsePing
+ *   [1]  Module index
+*/
+const uint8_t BasePing = 0x01;
+const uint8_t CommandPing = BasePing | MaskModuleCommand;
+const uint8_t ResponsePing = BasePing | MaskResponse;
+
+
+/*
+ * Display module index:
+ *   Broadcast to all modules which should turn on their display
+ *   and show the current settings. No response is expected.
+ *
+ * Request:
+ *   [0]  CommandDisplayModuleIndex
+*/
+const uint8_t CommandDisplayModuleIndex = 0x02 | MaskBroadcastCommand;
+
+
+
+/*
+ * Start linking:
+ *   Broadcast to all modules which should change to link mode.
+ *   During link mode the master will disable all other communication,
+ *   allowing the module to respond at will in response to user input.
+ *
+ *   Each module should send a CommandRequestLink message when user input
+ *   is provided.
+ *
+ * Request:
+ *   [0]  CommandStartLink
+ *
+ * Response (eventually):
+ *   See CommandRequestLink
+*/
+const uint8_t CommandStartLink = 0x10 | MaskBroadcastCommand;
+
+
+/*
+ * Request link:
+ *   Sent by a module when user input is provided to link this module
+ *   as the next in line. All other modules should disable sending this
+ *   message until the currently requesting module receives a response.
+ *
+ *   The master must respond with the new module index, which the
+ *   module must apply and store immediately.
+ *
+ * Request:
+ *   [0]  CommandRequestLink
+ *
+ * Response:
+ *   [0]  ResponseRequestLink
+ *   [1]  New module index
+*/
+const uint8_t BaseRequestLink = 0x11;
+const uint8_t CommandRequestLink = BaseRequestLink | MaskBroadcastCommand;
+const uint8_t ResponseRequestLink = BaseRequestLink | MaskResponse;
+
+
+/*
+ * Stop linking:
+ *   Broadcast to all modules when the master takes back control
+ *   over the communication line. No response is expected.
+ *
+ * Request:
+ *   [0]  CommandStopLink
+*/
+const uint8_t CommandStopLink = 0x12 | MaskBroadcastCommand;
+
+
+/*
+ * Set PWM value:
+ *   Aimed at a specific module, which must apply the specified
+ *   PWM values to the LED strips and respond with a
+ *   ResponseSetPWM message.
+ *
+ * Request:
+ *   [0]    CommandSetPWM
+ *   [1]    Module index
+ *   [2]    Flags, see below
+ *   [3,4]  PWM value for step 1 (0-4095, uint16_t)
+ *   [5,6]  PWM value for step 2 (0-4095, uint16_t)
+ *
+ * Response:
+ *   [0]    ResponseSetPWM
+ *   [1]    Module index
+*/
+const uint8_t BaseSetPWM = 0x20;
+const uint8_t CommandSetPWM = BaseSetPWM | MaskModuleCommand;
+const uint8_t ResponseSetPWM = BaseSetPWM | MaskResponse;
+
+// If included, the on-board verification LEDs should light up with
+// the specified PWM values as well. Otherwise they should be off.
+const uint8_t SetPWMFlagModuleLEDs = 0x01;
+
+
+/*
+ * Get sensor values:
+ *   Aimed at a specific module, which must response with a
+ *   ResponseGetSensors message containing the current sensor states.
+ *
+ * Request:
+ *   [0]    CommandGetSensors
+ *   [1]    Module index
+ *
+ * Response:
+ *   [0]    ResponseGetSensors
+ *   [1]    Module index
+ *   [2,3]  Analog (0-1023) or digital (0, 1023) value for sensor 1 (uint16_t)
+ *   [4,5]  Analog (0-1024) or digital (0, 1023) value for sensor 2 (uint16_t)
+*/
+const uint8_t BaseGetSensors = 0x30;
+const uint8_t CommandGetSensors = BaseGetSensors | MaskModuleCommand;
+const uint8_t ResponseGetSensors = BaseGetSensors | MaskResponse;
+
+#endif

module/src/settings.cpp

@@ -0,0 +1,58 @@
+/*
+ * Stairs lighting
+ * Copyright 2017 (c) Mark van Renswoude
+ *
+ * https://git.x2software.net/pub/Stairs
+*/
+#include "settings.h"
+#include <EEPROM.h>
+
+
+// First byte is 0xAA to recognize uninitialised EEPROM
+const uint8_t EEPROMHeader = 0xAA;
+const uint8_t EEPROMCurrentVersion = 1;
+
+const uint8_t EEPROMAddressHeader = 0;
+const uint8_t EEPROMAddressVersion = 1;
+const uint8_t EEPROMAddressModuleIndex = 2;
+
+
+void Settings::init()
+{
+  if (EEPROM.read(EEPROMAddressHeader) != EEPROMHeader)
+  {
+    EEPROM.put(EEPROMAddressHeader, EEPROMHeader);
+    EEPROM.put(EEPROMAddressVersion, EEPROMCurrentVersion);
+    EEPROM.put(EEPROMAddressModuleIndex, mModuleIndex);
+  }
+  else
+  {
+    uint8_t version = EEPROM.read(EEPROMAddressVersion);
+    if (version >= 1)
+    {
+      mModuleIndex = EEPROM.read(EEPROMAddressModuleIndex);
+    }
+  }
+}
+
+
+bool Settings::hasModuleIndex()
+{
+  return mModuleIndex != ModuleIndexUndefined;
+}
+
+
+uint8_t Settings::getModuleIndex(void)
+{
+  return mModuleIndex;
+}
+
+
+void Settings::setModuleIndex(uint8_t index)
+{
+  if (index == mModuleIndex)
+    return;
+
+  mModuleIndex = index;
+  EEPROM.put(EEPROMAddressModuleIndex, mModuleIndex);
+}

module/src/settings.h

@@ -0,0 +1,29 @@
+/*
+ * Stairs lighting
+ * Copyright 2017 (c) Mark van Renswoude
+ *
+ * https://git.x2software.net/pub/Stairs
+*/
+#ifndef __settings
+#define __settings
+
+#include <stdint.h>
+#include <stdbool.h>
+
+const uint8_t ModuleIndexUndefined = 0xff;
+
+
+class Settings
+{
+  private:
+    uint8_t mModuleIndex = ModuleIndexUndefined;
+
+  public:
+    void init();
+
+    bool hasModuleIndex();
+    uint8_t getModuleIndex();
+    void setModuleIndex(uint8_t index);
+};
+
+#endif

module/src/state.h

@@ -0,0 +1,20 @@
+/*
+ * Stairs lighting
+ * Copyright 2017 (c) Mark van Renswoude
+ *
+ * https://git.x2software.net/pub/Stairs
+*/
+#ifndef __state
+#define __state
+
+enum struct State: uint8_t
+{
+  WaitingForComm,
+  Linking,
+  LinkingRequest,
+  LinkingSet,
+  DisplayModuleIndex,
+  DisplayOff
+};
+
+#endif

module/upload.bat

@@ -0,0 +1 @@
+@pio run -t program

src/assets/version.h

@@ -2,12 +2,12 @@
 #define __assets_version
 
 const uint8_t VersionMajor = 2;
-const uint8_t VersionMinor = 1;
+const uint8_t VersionMinor = 2;
 const uint8_t VersionPatch = 0;
 const uint8_t VersionMetadata = 0;
-const char VersionBranch[] = "master";
+const char VersionBranch[] = "develop";
-const char VersionSemVer[] = "2.1.0";
+const char VersionSemVer[] = "2.2.0-unstable.1";
-const char VersionFullSemVer[] = "2.1.0";
+const char VersionFullSemVer[] = "2.2.0-unstable.1";
 const char VersionCommitDate[] = "2018-04-29";
 
 #endif