2 layers50.2 × 30.9 mm

Arduino jtag
felias-fogg/PyAvrOCD
A cross-platform GDB server for AVR MCUs integrated into the Arduino IDE 2
5 parts20
KiCad boards from 2 GitHub repositories tagged “mplab-snap”, the most starred first; open any of them in PCBKit.

felias-fogg/PyAvrOCD
A cross-platform GDB server for AVR MCUs integrated into the Arduino IDE 2

Dlloydev/Updi-Key
This DIY open source hardware connects inline with any UPDI programmer to provide a HV UPDI programming solution for tinyAVR® 0/1/2 series MCUs.