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Microcontroller
Adafruit Feather RP2040
Adafruit's Feather-format RP2040 board with battery charging, STEMMA QT, and clear CircuitPython-focused pin labels.
Processor
RP2040 dual-core Arm Cortex-M0+
Logic
3.3 V GPIO
Power
USB-C, LiPo connector, 3.3 V rail
Format
Feather module
Check before wiring
- RP2040 peripheral muxing is flexible, but simultaneous peripheral use still has limits.
- Use the pin labels appropriate for your runtime: CircuitPython names or RP2040 GP names.
Interfaces
GPIOI2CSPIUARTADCPWMUSB
Source-backed connector
Interactive pin map
Pin map
Connector
Feather 16+12 headers
USB at top, JST battery at top-left, component side up
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.
- Standard Adafruit Feather form factor; labels and RP2040 GPIO from the official PrettyPins PDF.
- GPIO is 3.3 V only and is not 5 V tolerant.
- A4/A5 silkscreen positions are broken out as D24 (GPIO24) and D25 (GPIO25) on this board; the Feather 'free' slot is D4 (GPIO6).
- Left header positions 1-16, right header positions 17-28 (continuing around the board).
All 28 pins (table)
| # | Signal | Role | Net | Also / notes |
|---|---|---|---|---|
| 1 | System | |||
| 2 | Power | 3V3 | ||
| 3 | Power | 3V3 | ||
| 4 | Ground | GND | ||
| 5 | ADC | GPIO26 | ||
| 6 | ADC | GPIO27 | ||
| 7 | ADC | GPIO28 | ||
| 8 | ADC | GPIO29 | ||
| 9 | GPIO | GPIO24 | ||
| 10 | GPIO | GPIO25 | ||
| 11 | SPI | SPI | GPIO18 | |
| 12 | SPI | SPI | GPIO19 | |
| 13 | SPI | SPI | GPIO20 | |
| 14 | UART | UART | GPIO1 | |
| 15 | UART | UART | GPIO0 | |
| 16 | GPIO | GPIO6 | ||
| 17 | Power | BAT | LiPo battery input | |
| 18 | System | 3.3 V regulator enable | ||
| 19 | Power | USB | USB 5 V | |
| 20 | GPIO | GPIO13 · onboard LED | ||
| 21 | GPIO | GPIO12 | ||
| 22 | GPIO | GPIO11 | ||
| 23 | GPIO | GPIO10 | ||
| 24 | GPIO | GPIO9 | ||
| 25 | GPIO | GPIO8 | ||
| 26 | GPIO | GPIO7 | ||
| 27 | I2C | I2C | GPIO3 | |
| 28 | I2C | I2C | GPIO2 |
Why it matters
- Feather ecosystem compatibility with battery-friendly power design.
- Adafruit pinout docs explain CircuitPython labels versus raw GP numbers.
- STEMMA QT makes I2C prototyping quick.
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