His solution: a foot pedal on/off switch. This isn’t some off-the-shelf foot switch, [Giorgos] made it from parts and pieces kicking around in one of his junk drawers.

From there, it was very to adapt the code so the foot switch would act as a third ‘Control’ button. The results look very professional, like a factory-made game controller.

I've got an old scythe usb 3 button foot pedal set that does this, still available for about $90, a no named brand version for $33 .. those extra leds really push the price up .