Split Keyboard

Open source keyboard software to be used in conjunction with CircuitPython on Raspberry Pi Picos.
The lib/common/kboard.py is all you need to get started but the split functionality comes from lib/common/klink.py.
have a look at the controller directory in src to get an understanding of how its meant to come together.

Implementation

Design

The design is two Raspberry Pi Picos hooked up to 30 buttons each (5 x 6) and connected together through a 3.5mm TRRS connection holding UART.

Left Side

Left side is just a button panel and it sends its presses through the UART connection to the main board.

Right side

Right side is the main board that takes all button presses and the UART connection and translates it into keypresses.

Hardware

./gerber/keyboard_comb.zip is the Right and Left keyboard joined with a perforation to be sent to any PCB maker. inside is the gerber and drill files needed to make the board.

Required Components:

• 2 * Raspberry Pi Pico, one for left other for right
• 1 * USB C 12 - 16 pin connector the PCB expects a raised profile with THT sheild pegs
• 1 * 5.1kΩ Resistor THT expected; to be used for the CC pins on the USB c connection
• 60 * SMAJ28CA Diodes or similar profile
• 60 * MX Key Switch up to preference, you can mix and match
• 2 * PJ320A 3.5mm Female Audio connector, for the UART connection
• 1 * '3.5mm TRRS male' to '3.5mm TRRS male' cable (90° optional) any length will do, try to get around 1".