PIR Motion Sensor Created by lady ada Last updated on 2020-01-25 05:57:43 PM UTC Overview PIR sensors allow you to sense motion, almost always used to detect whether a human has moved in or out of the sensors range.
They are small, inexpensive, low-power, easy to use and don't wear out.
For that reason they are commonly found in appliances and gadgets used in homes or businesses.
They are often referred to as PIR, "Passive Infrared", "Pyroelectric", or "IR motion" sensors.
PIRs are basically made of a pyroelectric sensor (https://adafru.
it/aKh) (which you can see below as the round metal can with a rectangular crystal in the center), which can detect levels of infrared radiation.
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