I built a Serial UPDI programmer. (For a certain definition of “built”) These are pretty simple. A diode goes between Tx and Rx on a CH340 module. Then a wire from Rx goes to the device being programmed.

I’m also using a SOICbite (slightly modified SOP8 test clip) as a programming clip. So, I used JST-SM 3-pin connectors between the two parts.

I tested this by installing “Blink” on this Nano-plus.

It Blinks! Next up, figuring out how to flash the Malenki firmware.


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