for use with micro hydra on the cardputer.
sends signal to pin 21 where led is located on cardputer rgb led flashes rainbow one long button push on G0 allows you to scroll through red/blue/green solid led light on if you press the reset button it loads back to micro hydra main screen with last color displayed still turned on
MicroHydra: https://github.com/echo-lalia/Cardputer-MicroHydra