Over the last weekend I worked a little bit more on the code, cleaning it up and making it a library. I also added the ability of sending keys with modifiers, and media keys. And that means I have everything I need to turn this keyboard into a macro keyboard.

I programmed the bottom row to be numbers (for quickly switching things in games), then there are the function keys, the media keys (volume up/down, play/pause, next, prev, etc.), some of the rarely used keys (PrintScr, Pause and ScrollLock) and the top row switches my workspaces.