Code:

x After turning off, turning on doesn't really respond well to the option button
- Store value in EEPROM (after a timeout)
- Long press shows menu with reset option (menu prevents accidental resets and can show battery voltage)


PCB:

- Bigger pads for the +5V vias




Pin-out reminder:

SW2 = -     = pin 2, PB3
SW3 = menu  = pin 3, PB4
SW1 = +     = pin 6, PB1