A Sadster key firmware for the Planck Ortholinear keyboard (Grid layout varient).
The original reddit thread.
The keyboard:
The proof: webm, youtube, reddit
Follow the instructions at Jack Humberts tmk_keyboard repository.
When ready to compile use the command line
$ make KEYMAP=slanckster
Alternativly, use the compiled .hex
file slanckster.hex
.