Seeeduino XIAO
$9.99
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Thumb-size SAMD21 development board with headers already soldered. Seeed Studio XIAO SAMD21 (pre-soldered, MPN 102010388) gives you an Arduino-compatible ARM Cortex-M0+ board in a compact 21 × 17.8 mm footprint.
Why this board
- Ready to plug into a breadboard: this is the pre-soldered XIAO SAMD21, so the pin headers are already installed.
- Small but useful I/O: 14 GPIO, 11 digital/analog-capable pins, 10 PWM pins, 1 DAC output, I2C, UART, SPI, and SWD pads.
- Arduino-family workflow: supported by Arduino IDE, PlatformIO, MicroPython, CircuitPython, and Zephyr.
- USB-C onboard: one connector for power and programming.
Specifications
- Manufacturer: Seeed Studio
- MPN: 102010388
- MCU: Microchip ATSAMD21G18 / SAMD21G18, ARM Cortex-M0+ up to 48 MHz
- Memory: 256 KB Flash, 32 KB SRAM
- Logic level: 3.3 V I/O
- Power input: USB Type-C 5 V or regulated 5 V input
- Dimensions: 21 × 17.8 mm class XIAO footprint
Use it for
- Small Arduino-compatible embedded projects, wearables, keyboard/macropad electronics, fixtures, and sensor experiments.
- Projects that need a tiny USB-C SAMD21 board without soldering headers first.
Gotchas
- 3.3 V logic only: do not drive the GPIO pins above 3.3 V.
- This is the pre-soldered XIAO SAMD21, not the unsoldered 102010328 board and not a wireless ESP32 / nRF XIAO variant.
- The board does not include battery charging or battery protection circuitry; use an external power-management module for LiPo/Li-ion projects.
