Seeeduino XIAO (SAMD21)

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

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

• 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)

• 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.