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USB Chorded Keyset

Adafruit

June 19, 2025

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Description

Build a custom USB HID device that works like a chording keyset using an Adafruit QT Py RP2040 and coded in CircuitPython.

Full Assembly Tutorial:
https://learn.adafruit.com/usb-keyset

This is a take on a custom computer input device, inspired by the original Doug Engelbert "Mother of all Demos" keyset from the 1960's that never quite caught on. This 5-finger keyset lets you type without moving your hand, entering full words and phrases by pressing multiple keys simultaneously as a chord.

It connects to a computer (PC, Mac, Linux, iOS) and appears as an additional keyboard. CircuitPython makes it easy to create keyboard devices with microcontrollers containing native USB.

QT Py RP2040
https://www.adafruit.com/product/4900

CHOC Kailh Switches
https://www.adafruit.com/product/5114

License:

Creative Commons — Attribution — Share Alike