What is a PIR Motion Sensor Module – SR501?

The PIR Motion Sensor Module – SR501 is a passive infrared (PIR) sensor module used to detect human movement within its sensing range. It is commonly used in projects and applications that require motion detection, such as security systems, automatic lighting, and occupancy sensing. The SR501 module includes a pyroelectric sensor, a Fresnel lens, and supporting circuitry to detect infrared radiation emitted by moving objects.