As the name implies,
motion sensors detect moving objects outside or even inside your home. They are often tied to lights, alarms, security cameras, and most recently, smart doorbells. ...
PIR or Passive Infrared
motion sensors are designed to reliably detect people, large pets & other large warm moving objects.
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Passive infrared (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.Sep 11, 2018
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The first cause of PIR false alarms is low or unstable voltage at the detector. Check behind and inside the PIR for insects and identify objects that can move or rapidly change temperature (e.g. pets, vermin, fax, mailbox, radiator or boiler etc). ...
