A low cost USB programmer for interfacing with both UPDI and UART from the same board
Unlike other UPDI programmers, this board allows access to both UART and UPDI without having to change the wiring between your programmer and MCU, making it easy to go from programming to reading debug data over serial.
This design makes heavy use of the JLC basic parts library to keep BOM costs down. At volumes as low as 25 units this board can be completed, assembled, and shipped for under $3 per board.
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