Seeeduino XIAO (SAMD21)
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The board as it appears on the Velxio canvas, with its full pin map
read live from the simulator (regenerated by scripts/gen-boards.mjs,
so it always matches what you can wire).
Family: Pro boards · Languages: Arduino C++
About this board
Section titled “About this board”The original XIAO: a SAMD21 Cortex-M0+ at 48 MHz with native USB, and a real
10-bit DAC on A0. The in-browser engine boots the firmware the Seeed SAMD core
produces; Serial is the USB CDC port, and analogWrite(A0, ...) drives the
DAC rather than a PWM, which is what the board does on the bench.
Start here
Section titled “Start here”- Blink — the shortest check that the board and toolchain work.
- OLED over I2C — an SSD1306 on the header pins.
- Knob and button — analog in, digital in, an LED out.
Pins (25)
Section titled “Pins (25)”- 2
- D0
- 4
- D1
- 10
- D2
- 11
- D3
- 8
- D4
- 9
- D5
- 40
- D6
- 5V
- GND
- 3V3
- 6
- D10
- 5
- D9
- 7
- D8
- 41
- D7
Every pin above is clickable on the canvas — click one to start a wire. Board-level behavior, quirks and example links live on the family page.