PIR (Passive Infrared) Motion Sensor Detector Module

Passive: They don't send out signals; they only receive infrared energy (heat) from other objects, hence "passive". Infrared Detection: All warm objects emit infrared radiation (heat), and the sensor detects fluctuations in this energy. Motion Sensing: A change in the infrared pattern, like a person entering the view, triggers the sensor. Components: Typically includes a pyroelectric sensor element and a Fresnel lens to focus infrared light. Applications: Widely used in security alarms, automatic lighting, and smart home devices.