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Microcontroller
Adafruit KB2040
A Pro Micro-shaped RP2040 board for keyboards, with STEMMA QT and a NeoPixel.
- 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 pin
- Format
- Pro Micro-shape castellated module
Before you wire
1 caution- GPIO is 3.3 V, unlike a 5 V Pro Micro. Check the keyboard design before swapping boards.
Pin map
Connector
Pro Micro-shape castellated edges (JP2, JP1)
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.
Pin
Hover, tap, or arrow to a pad to inspect it.
- Pad order and nets come from Adafruit's KB2040 board file, with GPIO numbers from CircuitPython pins.c.
- GPIO is 3.3 V only and is not 5 V tolerant, unlike a 5 V Pro Micro.
- D+ and D- are the USB data lines, for keyboards that bring USB out to a separate connector.
All 26 pins (table)
| # | Signal | Role | Net | Also / notes |
|---|---|---|---|---|
| 1 | Alt | USB D+ | ||
| 2 | UART | UART | GPIO0 | |
| 3 | UART | UART | GPIO1 | |
| 4 | Ground | GND | ||
| 5 | Ground | GND | ||
| 6 | GPIO | GPIO2 | ||
| 7 | GPIO | GPIO3 | ||
| 8 | GPIO | GPIO4 | ||
| 9 | GPIO | GPIO5 | ||
| 10 | GPIO | GPIO6 | ||
| 11 | GPIO | GPIO7 | ||
| 12 | GPIO | GPIO8 | ||
| 13 | GPIO | GPIO9 | ||
| 14 | Alt | USB D- | ||
| 15 | Power | RAW | ||
| 16 | Ground | GND | ||
| 17 | System | |||
| 18 | Power | 3V3 | ||
| 19 | ADC | GPIO29 | ||
| 20 | ADC | GPIO28 | ||
| 21 | ADC | GPIO27 | ||
| 22 | ADC | GPIO26 | ||
| 23 | SPI | SPI | GPIO18 | |
| 24 | SPI | SPI | GPIO20 | |
| 25 | SPI | SPI | GPIO19 | |
| 26 | GPIO | GPIO10 |
Source references
Why it matters
- Drops into most Pro Micro keyboard sockets.
- Default I2C is on the STEMMA QT connector, not the edge.
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