Adafruit QT Py - SAMD21 Dev Board with STEMMA QT

The QT Py - SAMD21 is an ultra-compact development board built around a 32-bit Cortex M0+ processor running at 48 MHz. It is designed for embedded projects where small size, flexible I/O and quick expansion matter. The onboard STEMMA QT connector makes it easy to add I2C sensors and accessories without soldering, while USB-C keeps powering and programming straightforward.

This board matches the Seeed XIAO shape and pinout and includes castellated pads for direct integration onto a custom PCB. With an onboard RGB NeoPixel, reset button and a useful mix of hardware interfaces, it is well suited for prototyping, compact controllers and lightweight USB-enabled projects in Arduino or basic CircuitPython use.

Product features

• Compact development board with SAMD21 microcontroller
• STEMMA QT connector for plug-and-play I2C modules
• USB-C connector for power and programming
• 11 GPIO pins available
• Built-in RGB NeoPixel LED
• Compatible with Arduino IDE and basic CircuitPython projects
• Castellated pads and Seeed XIAO compatible form factor
• Native USB support for serial, MIDI, HID and storage-style functions

Technical specifications

• 32-bit Cortex M0+ processor, 48 MHz
• 256KB flash memory
• 32KB RAM
• 11 GPIO
• 9 x 12-bit analog inputs
• 1 x analog output, 10-bit
• 9 x PWM outputs
• 6 x capacitive touch inputs
• Hardware I2C
• Hardware UART
• Hardware SPI
• Hardware I2S
• 3.3V regulator, 600mA peak output