Microcontroller Seeeduino XIAO SAMD21 Cortex M0+ Nano 48MHZ SPI I2C Interface For Arduino IDE/IOT System Type-C Development Tool

The Seeeduino XIAO SAMD21 is the smallest member of the Seeeduino series, designed for developers who need high performance in an extremely compact form factor. Built around the ARM Cortex-M0+ SAMD21G18 microcontroller, it delivers fast processing at up to 48MHz while maintaining very low power consumption.

Despite its small size, the board provides a rich set of interfaces including SPI, I2C, UART, PWM, and DAC output. It is fully compatible with the Arduino IDE, making development simple and accessible for beginners and professionals alike. Its breadboard-friendly design and USB Type-C interface allow quick prototyping and easy deployment in wearable devices, IoT systems, and mini electronics projects.

Specifications 

Microcontroller: SAMD21G18

CPU: ARM Cortex-M0+ (32-bit)

Clock Speed: Up to 48MHz

Flash Memory: 256KB

SRAM: 32KB

GPIO Pins: 14

Analog Pins: 11

Digital Pins: 11

PWM Pins: 10

DAC Output: 1 pin

Interfaces:

1 × I2C

1 × UART

1 × SPI

USB Interface: USB Type-C

LEDs:

1 User LED

1 Power LED

2 Serial download LEDs

Reset: Dual reset pads (short to reset)

Power Options: USB Type-C / Battery pads

Software Compatibility: Arduino IDE

Dimensions: 20 × 17.5 × 3.5 mm

Applications 

Wearable devices

IoT systems

Rapid prototyping

Mini Arduino-based projects

DIY keyboards

USB development tools

Sensor data acquisition projects

DAC-based signal output applications