What Is a PIR Motion Sensor?
A PIR sensor (passive infrared sensor) is a device that detects human motion by sensing variations in infrared radiation.
This sensor works by identifying the difference in infrared radiation intensity between the human body and the surrounding environment. PIR sensors are widely used in security cameras, alarm systems, motion-sensitive lighting, and household appliances. In security cameras, they trigger recording when human presence is detected. In lighting systems, they adjust illumination based on human movement.
PIR sensors function by discerning infrared radiation intensity changes. Notable features include their ability to detect motion and operate effectively in darkness, capitalizing on the infrared radiation emitted by humans.