Tindie recently listed Comu, a compact development board built around the WCH CH32V203 RISC-V microcontroller. Measuring 13 × 9.4mm, the board fits inside a USB-A port and combines programmable touch controls, LEDs, USB device support, and access to several GPIO signals.

The CH32V203 operates at up to 144MHz using its internal oscillator and provides 224KB of application flash, 24KB of boot flash, and 20KB of SRAM. Other integrated features include a 12-bit ADC, DMA controller, touch-sensing hardware, and a full-speed USB peripheral.

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