PIR sensor


PIR sensor

PIR sensors allow you to sense motion & to detect whether a human has moved in or out of the sensor’s range. They are small, inexpensive, low-power, easy to use and don’t wear out. PIRs are basically made of a pyroelectric sensor, which can detect levels of infrared radiation.



PIR sensors use a pair of pyroelectric sensors to detect heat energy in the surrounding environment. These two sensors sit beside each other, and when the signal differential between the two sensors changes (if a person enters the room, for example), the sensor will engage. That may mean it triggers an alarm, notifies authorities, or maybe turns on a floodlight. IR radiation focuses on each of the two pyroelectric sensors using a series of lenses constructed as the sensor’s housing. The detection range is generally between 5 meters and 12 meters.


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