ServoBelt™ Rotary

NPN Sensor (aka sinking):
This is a switched Negative output. A permanent positive voltage source will be connected to the device that is to be activated and the other side of the circuit is connected to the NPN sensor’s output. When the sensor is triggered, the output of the NPN is 0 volts. Therefore the device is also pulled to ground, thus completing the circuit.

PNP Sensor (aka sourcing):
This is a switched Positive output. A permanent negative voltage source is connected to the device that is to be activated with the other end of the circuit connected to the PNP sensor’s output. When the sensor is triggered, the output of the PNP is a positive voltage. As a result, the device’s circuit is completed.

Reed Sensor:
A read sensor is triggered to close when it experiences a magnetic field. When there is an absence of a magnetic field, the stiffness of the reed causes them to return to their original open position.