I recently got into Mechanical Keyboards and thought it would be fun to build my own 8 key mechanical macropad. The process is pretty easy and made even easier with the addition of the Seeeduino Xiao which is super cheap and has enough inputs to create a decent sized keypad without the complexities of figuring out how to code a matrix (which if you feel like doing you could create a pad of up to 25 keys with this tiny device!).
The enclosure is 3D printed. Andy has a full separate guide on installing CircuitPython on the microcontroller. CircuitPython has a plethora of device libraries to interface with hardware including one to act as a keyboard via USB to a host computer.
Stop breadboarding and soldering – start making immediately! Adafruit’s Circuit Playground is jam-packed with LEDs, sensors, buttons, alligator clip pads and more. Build projects with Circuit Playground in a few minutes with the drag-and-drop MakeCode programming site, learn computer science using the CS Discoveries class on code.org, jump into CircuitPython to learn Python and hardware together, TinyGO, or even use the Arduino IDE. Circuit Playground Express is the newest and best Circuit Playground board, with support for CircuitPython, MakeCode, and Arduino. It has a powerful processor, 10 NeoPixels, mini speaker, InfraRed receive and transmit, two buttons, a switch, 14 alligator clip pads, and lots of sensors: capacitive touch, IR proximity, temperature, light, motion and sound. A whole wide world of electronics and coding is waiting for you, and it fits in the palm of your hand.