Adafruit QT Py CH32V203 Dev Board with STEMMA QT

This compact dev board, the QT Py, features the cutting-edge CH32V203 low-cost processor, offering a powerful 32-bit RISC-V core that runs up to 144MHz. Its small size belies its capabilities, making it ideal for USB-based projects at an accessible price.

Specifications include 10KB SRAM, 32KB Flash with an additional 224KB external Flash for versatile program or data storage, ADC, timers, USB device, UART, I2C, and SPI. While not heavily supported like other chips such as ATmega or ESP32, it suits those adept at working with Makefiles and configuration files.

The QT Py format, compatible with Seeed Xiao, features castellated pads for soldering to a PCB and includes a handy STEMMA QT I2C port. It also provides an RGB NeoPixel and two buttons for reset and bootloader entry, ensuring you can upload code via USB without additional programmers.

With a USB Type C connector, RGB NeoPixel LED, and 10 GPIO pins capable of ADC input, this small yet mighty microcontroller supports plug-n-play with STEMMA QT sensors. Measuring about the size of a postage stamp, this device packs robust capabilities into a diminutive form, offering notable options for advanced debugging with SWD pads.