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3 wires on Motion Sensor?

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1.5K views 8 replies 5 participants last post by  JJC  
NO! Do not connect power and ground together! Cut the output wire from the sensor. Then attach the wire you just cut (from the board side) to power. In some sensors the output may be ground when it turns on, in that case connect the wire to ground. The way to figure this out is to put a multimeter (set on volts) on the output and ground. If it goes high when the sensor is tripped connect to power. If it goes low when it's tripped connect to ground.