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topshed/Solar Power Pi - Arduino method.md

Last active September 25, 2018 17:00
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Solar Power Pi - Arduino method.md
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Solar Power Pi - Arduino method.md

Equipment

  • RTC
  • Powerbosst 500
  • Pimoroni LipoShim
  • Arduino Trinket

Imgur

Process

  • Trinket sets shutdown_pin (3) LOW [-> Pi GPIO 4]

  • Trinket sets cutpower_pin (4) to LOW [-> LipoShim EN pin]

  • Trinket sets shutdown_pin (3) HIGH [-> Pi GPIO 4]

  • Trinket sets cutpower_pin (4) to HIGH [-> LipoShim EN pin]

  • LipoShim switches on power to Pi

  • Pi boots

  • Pi does stuff

  • Arduino waits 3 minutes

  • Trinket sets shutdown_pin (3) LOW [-> Pi GPIO 4]

  • Pi starts shutdown

  • Trinket waits 90 seconds

  • Trinket sets cutpower_pin (4) to LOW [-> LipoShim EN pin]

  • LipoShim cuts power to Pi

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