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Possible reasons the Flashlight won't turn on:

  • Battery is low
  • external clock is damaged (usually from a fall)
  • incorrect input for a program

Notes on power flow:

  • atmega168pa pin 10 (aka DPIN_PWR/PB0) is HIGH and goes by D3 to IC7 pin 1 (voltage regulator enable)) - stay on
  • CP2102 drops/goes high (DTR pin 28 to atmega pin 25) - reset


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