If you find yourself wishing for even more functionality, you might want to build something like this custom macro keyboard with built ... The controller is an Arduino Leonardo and the enclosure ...

The portable keyboards have a serial interface and custom connectors depending ... was to adapt the PPK as a generic USB HID keyboard using an Arduino Pro Mini clone, with a 3D printed adapter ...

My first custom hand-wired mechanical keyboard project was a macropad ... Just ensure you're using an Arduino, Leonardo, or ...