Adafruit KB2040 - RP2040 Kee Boar Driver

An Arduino Pro Micro-shaped board for Keebs with RP2040. Adafruit have mixed together what we liked most about the SparkFun Pro Micro RP2040 (Qwiic / STEMMA QT I2C port on the end) and Elite-C (castellated pads & pins for D+ and D-) and our existing RP2040 boards (boot button can be used for user, 8MB QSPI flash, onboard NeoPixel, jumper for skipping the diode/fuse for high power RGB LEDs or USB hosting). Adafruit have even got it to all fit on a 2-layer PCB with 7/7 routing – just needed to make the smallest caps and resistors 0402.

With 20 GPIO available (18 on castellated pins, 2 on STEMMA QT port) you can easily make up to 100-keys matrices, or common 65% 5x15 layouts. Use a plug-and-play QT cable to connect to the last two pins without having to do any desoldering/rework.

Quick Spec

• RP2040 32-bit Cortex M0+ dual core running at ~125 MHz @ 3.3V logic and power. 264 KB RAM, No EEPROM. 12 MHz crystal for perfect timing
• 8 MB SPI FLASH chip for storing files and CircuitPython/MicroPython code storage
• 20 x GPIO pins with following capabilities:
• 18 GPIO on castellated/pin breakout pads. 2 GPIO on QT port that can be easily accessed for 5x15 keyboard layouts
• Four 12 bit ADCs
• Two I2C, Two SPI and two UART peripherals, we label one of for the 'main' interface in standard Pro Micro locations
• 16 x PWM outputs - for servos, LEDs, etc
• The 10 digital non-ADC GPIO are consecutive for maximum PIO compatibility
• RGB NeoPixel for colorful status indication
• Classic green power LED
• Both Reset button and Bootloader select button for quick restarts. Bootloader button is also available as a generic GPIO input button
• STEMMA QT connector on the end is compatible with the SparkFun Qwiic I2C connector, and can be used to plug and play I2C devices, or just as 2 extra GPIO pins
• 3.3V regulator with 500mA peak current output
• RAW output, for powering NeoPixels or other 5V devices. Jumper on bottom lets you skip over the 500mA fuse, for up to 2A from USB ports.
• USB Type C connector lets you access built-in ROM USB bootloader and serial port debugging
• Extra D- and D+ breakouts for alternative USB connection options
• Dimensions: 35 x 17.8 x 4.9mm
• Net Weight: 7g

Resources

• Product Page
• Product Wiki
• RP2040 Datasheet
• Pinout

Shipping List

• 1 x Adafruit KB2040 - RP2040 Kee Boar Driver