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Microcontroller
SparkFun Pro Micro RP2040
SparkFun's RP2040 board in the Pro Micro footprint, popular for USB HID and keyboards.
- GPIO
- I2C
- SPI
- UART
- ADC
- PWM
- USB
- Processor
- RP2040 dual-core Arm Cortex-M0+
- Logic
- 3.3 V GPIONot 5 V tolerant
- Power
- USB-C, RAW, 3V3
- Format
- Pro Micro footprint
Before you wire
3 cautions- GPIO is 3.3 V only.
- The Pro Micro footprint differs from Raspberry Pi Pico pin numbering.
- USB boot/reset behavior matters for keyboard firmware recovery.
Pin map
Connector
24-pin castellated dual-row (12×2)
USB at top, component side up, headers on both long edges
Simplified technical illustration. Pin data is source-backed; verify against the linked documentation before wiring.
Pin
Hover, tap, or arrow to a pad to inspect it.
- RP2040 at 133 MHz; pin labels from the SparkFun Pro Micro RP2040 hookup guide (DEV-18288).
- GPIO is 3.3 V only and not 5 V tolerant.
- RAW accepts unregulated 5 V via an onboard regulator.
- SPI edge pins follow SparkFun's board design: SCK GP22, CIPO GP20, COPI GP23, CS GP21. The Qwiic connector carries I2C on GP16 (SDA) and GP17 (SCL).
All 24 pins (table)
| # | Signal | Role | Net | Also / notes |
|---|---|---|---|---|
| 1 | UART | UART0 | UART0 TX | |
| 3 | UART | UART0 | UART0 RX | |
| 5 | Ground | GND | ||
| 7 | Ground | GND | ||
| 9 | I2C | I2C1 | I2C1 SDA | |
| 11 | I2C | I2C1 | I2C1 SCL | |
| 13 | GPIO | |||
| 15 | GPIO | |||
| 17 | GPIO | |||
| 19 | GPIO | |||
| 21 | GPIO | |||
| 23 | GPIO | |||
| 2 | Power | RAW | Unregulated 5 V input. | |
| 4 | Ground | GND | ||
| 6 | System | |||
| 8 | Power | VCC | 3.3 V regulated output. | |
| 10 | ADC | |||
| 12 | ADC | |||
| 14 | ADC | |||
| 16 | ADC | |||
| 18 | SPI | SPI0 | SPI0 SCK | |
| 20 | SPI | SPI0 | SPI0 RX / CIPO | |
| 22 | SPI | SPI0 | SPI0 TX / COPI | |
| 24 | SPI | SPI0 | SPI0 CS |
Source references
Why it matters
- Official hookup guide documents the board pinout and solder jumpers.
- Pro Micro footprint works with many keyboard and HID designs.
- RP2040 PIO enables unusual digital interfaces.
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