Product description: QT Py - board with CH32V203 microcontroller - STEMMA QT - Adafruit 5996
The QT Py CH32V203 from Adafruit is a small but powerful board designed in the Seeed Xiao form factor . It features a USB Type-C connector for power and programming, a STEMMA QT connector ideal for I2C sensors , an addressable NeoPixel RGB LED, and pushbuttons for easy bootloader entry without an additional programmer. The CH32V203G6 processor offers a 32-bit architecture, single-cycle multiply/divide, 10KB of SRAM, and 256KB of Flash (32KB internal + 224KB external)—enough for many advanced USB-based projects.
QT Py - board with CH32V203 microcontroller - STEMMA QT - Adafruit 5996.
The board has a CH32V203 processor based on the RISC-V architecture.
Adafruit QT Py Main Features
- 144 MHz RISC‑V processor : Powerful 32-bit CH32V203G6 chip with single-cycle multiplication and division, ideal for complex calculations
- USB Type-C connector : enables fast power and data transfer without the need for older connectors
- STEMMA QT : a convenient, ready-to-use I2C connector that allows you to quickly connect your board to sensors and modules without soldering
- 10 GPIO pins with ADC : all digital pins have analog input functionality, which expands the range of possible applications
- NeoPixel RGB LEDs : Addressable RGB LED allows you to create signaling, lighting effects, or status indicators
- Onboard 3.3V regulator : Provides up to 600mA of current - enough to power peripherals and sensors
- Reset and Bootloader buttons : facilitate programming and testing - allow easy entry into software update mode
- SWD pins : Debug pins on the bottom of the board allow access to advanced code debugging
QT Py pinout description
The Adafruit QT Py CH32V203 board is designed with pinout compatible with the Seeed Xiao format . It features 10 universal GPIO pins , each of which supports an analog input (ADC) function . The main signal lines are as follows:
- I2C: SCL (PB6) and SDA (PB7) - used for communication with I2C sensors and modules; they are also connected to the STEMMA QT connector
- UART: TX (PA2) and RX (PA3) - serial data transmission lines, useful for communication with Bluetooth or GPS modules, among others
- SPI: SCK (PA5), MI/MISO (PA6), MO/MOSI (PA7) - complete SPI outputs for fast communication with memories or displays
- NeoPixel: PA4 - controls the built-in addressable RGB diode
- Power and ground: 5 V (from USB), 3.3 V (from the regulator), GND - basic power lines for peripheral systems
- SWD: special pins on the bottom of the board for debugging and low-level programming
All pins are available as through holes with tin plating, which allows surface soldering directly to another PCB.
Pinout diagram.
The module is equipped with a STEMMA QT connector.
Programming and Arduino IDE
The board doesn't support CircuitPython or MicroPython, and support for the Arduino IDE is in its early stages . Programming is primarily done using tools like Makefiles, Git, and manual configuration files . TinyUSB allows code transfer over USB, and a dedicated bootloader allows you to enter programming mode without the need for an external programmer. Adafruit provides guides to help you set up the environment , test I2C, run NeoPixel effects, and support HID (e.g., keyboards).
Technical specifications of the board
- Microcontroller: CH32V203G6, 144 MHz, RISC‑V
- Memory: 10 KB SRAM, 32 KB Flash + 224 KB Flash XIP
- Power supply: 3.3 V regulator (600 mA), 5 V from USB
- GPIO: 10 pins, all with ADC input
- Interfaces: I2C, SPI, UART, USB Type-C
- LED: built-in RGB NeoPixel (PA4)
- Connectors: STEMMA QT, USB Type-C
- Buttons: Reset and Bootloader
- Debugging: SWD pins on the bottom of the board
Contents of the set
- 1x Adafruit QT Py CH32V203 Board
- 1x 16-pin goldpin connector with 2.54 mm pitch
Elements included in the set.
