Electronics/PiPower
Electronics/PiPower
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Added some build notes of my struggles

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This commit is contained in:
Mark van Renswoude 2017-04-16 13:21:59 +02:00
parent 99d55d9b5e
commit 14039d54a0
2 changed files with 18 additions and 3 deletions
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2
Pi/PiPower.py
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@ -11,7 +11,6 @@ import time
import os import os
GPIO.setmode(GPIO.BCM) GPIO.setmode(GPIO.BCM)
GPIO.setup(15, GPIO.OUT)
GPIO.setup(18, GPIO.IN, pull_up_down=GPIO.PUD_DOWN) GPIO.setup(18, GPIO.IN, pull_up_down=GPIO.PUD_DOWN)
hasShutdown = False hasShutdown = False
@ -24,7 +23,6 @@ def shutdownSignal(channel):
GPIO.add_event_detect(18, GPIO.RISING, callback=shutdownSignal, bouncetime=300) GPIO.add_event_detect(18, GPIO.RISING, callback=shutdownSignal, bouncetime=300)
GPIO.output(15, GPIO.HIGH)
try: try:

17
Pi/notes.txt
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@ -34,3 +34,20 @@ enable_uart=1
I have encountered this default of 0 in RetroPie, but I've seen I have encountered this default of 0 in RetroPie, but I've seen
reports for a standard installation as well: reports for a standard installation as well:
https://www.raspberrypi.org/forums/viewtopic.php?f=28&t=141195 https://www.raspberrypi.org/forums/viewtopic.php?f=28&t=141195
You can connect power directly to PP1 or PP2 (+5V) and PP5 (GND).
Add some capacitors between de ATTiny85's +5V and GND pins.
I learned the hard way that if you don't, the power will drop to the
ATTiny and it'll reboot as soon as the Pi draws power, taking the
relay and thus the Pi with it. This cycle repeated and killed my Pi.
I bodged it and added in order two 100 nF ceramic capacitors, one 10 uF
electrolytic and one 470 uF electrolytic to get stable results.
I'm still learning electronics basics, but I recognize this is bad design.
Maybe a diode would've helped to prevent the Pi from draining the
capacitors immediately?