SeeedStudio XIAO SAMD21 Pinout & Specifications
The SeeedStudio XIAO SAMD21 is the board that started the entire XIAO form factor revolution. It uses the same chip as the Arduino Zero but in a footprint the size of a postage stamp.
Key Specifications
- Processor: ARM Cortex-M0+ 32bit @ 48MHz (SAMD21G18)
- Memory: 256KB Flash, 32KB SRAM
- Operating Voltage: 3.3V
- Input Voltage: 5V via USB-C
- Pins: 11 digital/analog pins, 1 True DAC, 1 I2C, 1 UART, 1 SPI
Important Wiring Notes
- True Analog Output: Unlike most standard Arduinos which only simulate analog using PWM, pin A0 is a true DAC (Digital-to-Analog Converter) capable of generating real analog waveforms.
- Logic Level: 3.3V logic. Connecting 5V directly to any GPIO pin will instantly destroy the microcontroller!
Related Guides
Need to learn how to wire sensors to this board? Check out our Academy for step-by-step tutorials!