
A PIR (Passive Infrared) sensor detects human presence by sensing infrared (IR) radiation emitted by the body. When a person moves within its range, the sensor detects the change in IR energy and triggers an output signal, indicating presence.
A PIR (Passive Infrared) sensor detects human presence by sensing infrared (IR) radiation emitted by the body. When a person moves within its range, the sensor detects the change in IR energy and triggers an output signal, indicating presence.