1209 / C035 - CH32X035 USB Power Meter

USB power meter built around the WCH CH32X035 RISC-V microcontroller.

Hardware: INA228 20-bit power/energy monitor (up to 85 V, 10 mOhm shunt), ST7789 240x135 color TFT display, USB-C connector for Full-Speed USB.

Firmware: bare-metal C, USB CDC virtual serial port with an interactive data logging shell (live streaming, averaging, calibration, mAh/mWh accumulator, min/max tracking). Supports USB DFU 1.1 firmware updates via a companion bootloader.