This Raspberry Pi Pico-Powered Compact Keyboard PCB Breaks Unused GPIO Out to 3.5mm Jacks

Designed to make the most of the RP2040 microcontroller, this clever compact keyboard includes a rotary encoder and two expansion ports.

Reddit user “stewartd430” has designed a Raspberry Pi Pico-powered compact keyboard, complete with an expansion port for adding extra hardware to the microcontroller’s general-purpose input/output (GPIO) pins.

“I designed a keyboard PCB for the Pico,” Stewart explains of his project, which builds on earlier efforts including a simpler 20-key macro keypad driven by the same Raspberry Pi Pico board with RP2040 microcontroller. “65 percent layout, with 15 added macro keys and rotary encoder.”

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