This sensor is equipped with an Infrared Emitter and Receiver Diode (tube) to detect objects via IR frequencies being reflected off the object’s surface and picked up by the receiving diode. The built-in comparator circuit senses the received IR signal, turns the on-board LED green and sends a low level signal to the output pin (perfect for triggering a relay). The detection distance can be adjusted using the on-board potentiometer.
2x Infrared Sensor Module