Here are the KiCAD and Gerber files for creating the circuit boards this firmware is designed to run on.

You could theoretically run it on a bare ATmega328 chip or another board, but the code is specialized for this board and uses hard-coded pin numbers.

Bill Of Materials

• 1x assembled PCB
  • buy assembled PCBs from PCBWay with all the surface mount soldering done for you
    • https://www.pcbway.com/project/shareproject/ByteSizedEncoderDecoder_v1_1_a5a4bd50.html
  • or do your own surface mount soldering:
    • circuit board:
      • If you buy PCBs from PCBWay through this link PCBWay generously gives me a 10% commission without costing you anything
        • https://www.pcbway.com/project/shareproject/ByteSizedEncoderDecoder_v1_1_a5a4bd50.html
        • If you buy PCBs with another method (send ./PCB Production/gerbers-ByteSizedEncoderDecoder-v1.1.zip file) here's some info you might need: min track/spacing=6/6mil, min hole size=0.3mm
    • 2x JST SH https://www.digikey.com/en/products/detail/jst-sales-america-inc/SM04B-SRSS-TB/926710
    • 1x ATmega328PB TQFP https://www.digikey.com/en/products/detail/microchip-technology/ATMEGA328PB-AU/5638812
• 4x 1x08 0.1" female header pins