AngstromIO, one of the smallest devboards out there, barely longer than a USB C connector, based on the Attiny1616 MCU. And a dual CH340 board for programming and debugging, and another devboard, based on the CH32V003 - Dieu-de-l-elec/AngstromIO-devboard

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AngstromIO is a miniature development board (8.9mm x 9mm) based on the ATtiny1616 MCU, featuring USB-C power, 2 RGB addressable LEDs, I2C and GPIO breakouts, and Arduino compatibility. The project also includes a dual CH340E programmer board supporting both UPDI programming and serial debugging via two USB-C connectors, plus a breadboard-friendly CH32V003 (RISC-V) experimentation board with a 4x5 charlieplexed LED matrix. All three PCBs are panelized together, designed in EasyEDA Pro with 2-layer, 1.0mm purple soldermask boards. BOMs are still pending.

GitHub - Dieu-de-l-elec/AngstromIO-devboard: AngstromIO, one of the smallest devboards out there, barely longer than a USB C connector, based on the Attiny1616 MCU. And a dual CH340 board for programm