maker(Passive Infrared)

PIR Sensor

What is a PIR sensor?

A PIR sensor is a motion detection device that uses infrared radiation to detect changes in heat signatures within its field of view. It works by measuring variations in thermal energy emitted by warm objects like humans or animals moving through the sensor's detection zone. PIR sensors are commonly used in security systems, automatic lighting controls, and home automation applications because they are energy-efficient, reliable, and can detect motion without emitting any signals themselves.

Related Terms

IR Sensor

Infrared

An IR sensor is an electronic device that detects infrared radiation in its surrounding environment. It can either emit infrared light and measure reflections (active IR sensor) or passively detect infrared radiation emitted by objects (passive IR sensor). These sensors are commonly used in motion detection systems, proximity sensing, temperature measurement, and remote control applications due to their ability to detect heat signatures and movement without physical contact.