Quote Originally Posted by DistortedDesign View Post
OK mach is not registering the change when the beam is broken. My c10 power supply doesn't have a ground only pos and neg. Do I need to connect the c10 gnd to the 120v gnd on the main power supply?
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Follow the diagram posted to connect the ground, it is accurate.

The C10 5 volt power supply negative is connected to the C10 ground / (GND)

Jeff...