Input Cover Controller

The Input Cover Controller is an RP2040-based board by CRImier (Arya) that lets you reuse a Framework input cover (palmrest with keyboard and touchpad) as a standalone USB device. It connects to the keyboard matrix, touchpad, power button, fingerprint sensor, and LEDs — turning a spare input cover into a fully functional USB keyboard¹².

Design

The board connects to the input cover's FPC connector and exposes it over USB-C. It includes an optional USB hub (SL2.1) for the fingerprint sensor and adds two extra USB ports. All input connector pins are connected, with a 595 shift register driving the Caps Lock and fingerprint RGB LEDs. QMK firmware and MicroPython test code are available².

Specification	Details
Creator	CRImier (Arya)
MCU	RP2040
USB Hub	SL2.1 (optional)
Firmware	QMK, MicroPython
Source	GitHub

Footnotes

1. Input Cover controller - reusing an Input Cover as a USB device — Framework Community (CRImier, October 2022) ↩

2. CRImier/MyKiCad — framework_input_controller — GitHub ↩ ↩²