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doorman2/keypad/README.md

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keypad howto

  1. flash MiniCore for atmega168pa
  2. make sure you have the Keypad arduino library
  3. if re-making the hw from scratch, you need to make some HW mods to the keypad:
    • green led moved to a different pin (due to UART conflict)
  4. verify the pin IDs

Clock external 4 mhz Board: ATmega168 Variant: 168/168A avrdude -p atmega168 -c usbasp -v -B 4 -U lfuse:w:0xed:m -U hfuse:w:0xdd:m -U efuse:w:0xf9:m