Adafruit KB2040 - RP2040 Kee Boar Driver

A compact RP2040-based microcontroller designed specifically for mechanical keyboard builds. The KB2040 uses the Pro Micro form factor for drop-in compatibility with existing keyboard PCBs, while adding modern features like USB-C, STEMMA QT, and native USB HID support.

Supports CircuitPython, Arduino, and KMK firmware for flexible keyboard programming.

Key Features

• Pro Micro Compatible – Drop-in replacement for keyboard PCBs
• RP2040 Processor – Dual-core ARM Cortex-M0+ at 125MHz
• USB-C Connector – Modern, reversible connection
• 8MB Flash – Plenty of space for firmware and macros
• STEMMA QT Port – I2C expansion without soldering
• RGB NeoPixel – Built-in status LED
• Castellated Pads – Easy surface-mount or through-hole installation

Specifications

• Processor – RP2040 (Dual Cortex-M0+ @ 125MHz)
• Memory – 264KB RAM, 8MB Flash
• GPIO – 20 pins (18 castellated + 2 via STEMMA QT)
• ADC – 4× 12-bit channels
• PWM – 16 outputs
• Logic Level – 3.3V
• Regulator – 3.3V @ 500mA
• Dimensions – 1.3" × 0.7"

Ideal For

• Custom mechanical keyboards
• Macro pads and key matrices (up to 100 keys)
• 65% keyboard layouts
• HID device projects

Resources

• Adafruit Learning Guide