XIAO SAMD21 – Thumb-Sized Arduino-Compatible Development Board

A tiny development board powered by the Microchip SAMD21G18. It is made for compact Arduino projects, wearables, sensors, and small embedded builds. Features: ARM Cortex-M0+ processor Clock speed up to 48MHz 256KB Flash 32KB SRAM 11 digital I/O pins 11 analog inputs 10 PWM pins 1 DAC output Supports I2C, SPI, UART, SWD USB Type-C connection 3.3V logic level Compact size: 21 × 17.8mm Works with Arduino IDE, PlatformIO, MicroPython, and CircuitPython Applications: Arduino projects Wearable electronics Sensor projects Small robots Embedded systems DIY electronics Compact prototypes Learning and school projects