PIR infrared sensor module is based on infrared technology. High sensitivity, high reliability, low power consumption, low voltage operation mode. It’s Compatible with ARDUINO, RASPBERRY PI, AVR, PIC, 8051, etc. Widely used in various auto-sensing electrical equipments for security, automation and lighting control systems because of its unique property of detecting the movement of infrared emitting objects like human bodies. This sensor is equipped with Fresnel lens for improving the detection pattern. All you have to do is give the supply voltage and leave for about a minute to stabilize. Any movement detection causes the sensor output to go high (3.3V). This sensor can be easily used for 220V automatic lighting systems with the help of a simple relay circuit.