PIR Motion Sensor ModuleThe PIR Sensor module allows you to sense motion. It is almost always used to detect the motion of a human body within the sensor's range. It is often referred to used "PIR", "Pyroelectric", "Passive Infrared" and "IR Motion" sensor. The module has an on board pyroelectric sensor, conditioning circuitry and a dome shaped Fresnel lens. The PIR sensor module provides an output "HIGH" when a human body is detected within its range and an automatic Delay