PiR sensor stands for passive infrared motion
sensor. It is based on pyro electric effect that is, it converts heat
into electrical energy. It detects the motion of human body and any
other living thing which generates the heat. This property of pir is
used for detecting the living body and interfacing this module with
the micro-controller. The pir sensor has 3.3V output when it senses
any body and 0V when there is no motion nearby. It has a good range
of 2-7 meters depending on the module and the temperature conditions.
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