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Microcontroller
Adafruit QT Py RP2040
A tiny RP2040 board in the Seeed XIAO footprint with a STEMMA QT connector, NeoPixel, and CircuitPython support — an easy stepping stone from the QT Py SAMD21.
Processor
RP2040 dual-core Arm Cortex-M0+
Logic
3.3 V GPIO
Power
USB-C or 5V pad
Format
Seeed XIAO-compatible 14-pad castellated module
Check before wiring
- GPIO is 3.3 V only.
- STEMMA QT I2C (GPIO22/23) is separate from the pad I2C (GPIO24/25).
- NeoPixel power is switched via GPIO11; disable it to save power.
Interfaces
GPIOI2CSPIUARTADCPWMUSB
Source-backed connector
Interactive pin map
Pin map
Connector
QT Py RP2040 14 castellated pads (Seeed XIAO footprint)
USB-C at top, component side up, 7 pads down each long edge
Simplified technical illustration. Pin data is source-backed; verify against the linked documentation before wiring.
Hover, tap, or focus a pad to inspect a pin. Use arrow keys to move between pins.
- RP2040; pin labels from the Adafruit QT Py RP2040 learn guide and CircuitPython pins.c.
- USB-C at top, component side up; footprint matches Seeed XIAO.
- GPIO is 3.3 V only and not 5 V tolerant.
- Onboard STEMMA QT uses GPIO22 (SDA) and GPIO23 (SCL) — separate from the pad I2C.
- NeoPixel on GPIO12; BOOT button on GPIO21; NeoPixel power switch on GPIO11.
All 14 pins (table)
| # | Signal | Role | Net | Also / notes |
|---|---|---|---|---|
| 1 | ADC | GPIO26 / ADC0 | ||
| 2 | ADC | GPIO27 / ADC1 | ||
| 3 | ADC | GPIO28 / ADC2 | ||
| 4 | ADC | GPIO29 / ADC3 | ||
| 5 | I2C | I2C | GPIO24 | |
| 6 | I2C | I2C | GPIO25 | |
| 7 | UART | UART1 | GPIO20 / UART1 TX | |
| 14 | Power | 5V | USB 5 V bus. | |
| 13 | Ground | GND | ||
| 12 | Power | 3V3 | ||
| 11 | SPI | SPI0 | GPIO3 / SPI0 TX | |
| 10 | SPI | SPI0 | GPIO4 / SPI0 RX | |
| 9 | SPI | SPI0 | GPIO6 / SPI0 SCK | |
| 8 | UART | UART1 | GPIO5 / UART1 RX |
Why it matters
- XIAO footprint fits Seeed Grove shields and many adapters.
- Onboard STEMMA QT connector for tool-less I2C wiring.
- Official learn guide and CircuitPython pins.c document every pad GPIO.
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