The keyboard is a custom build from [Taliyah Huang] which uses a pair of Arduinos, one in each half of the keyboard, to communicate key and mouse information to a third Arduino which is plugged in ...

Gadgets Save Precious Desk Space With a Sliding Split Keyboard That’s Also Your Mouse Taliyah Huang's Mouseky keyboard can also replicate most of the MacBook's trackpad's functionality.

The idea early on was to leverage existing Arduino libraries to connect with a standard USB mouse, specifically, the hardware would take the form of an Arduino Mega 2560 with a USB Host Shield.