This is an easy to use limit switch optoisolator board.
It provides an easy way to limit noise from getting into your GRBLDuino or other CNC controller. Because the optoisolator provides no direct connection between the switch and controller, noise introduced into the cables will not propagate to controller and cause issues. Solder jumpers are provided to allow the optoisolators to be Arduino powered instead of requiring separate power.
Available either as surface mount or through hole.
Available either assembled or as a kit.
Requires an additional 5v power supply to further isolate the switches.