HC-SR501 is a Passive Infrared (PIR) motion detector sensor.
It is used for detection of moving objects, particularly for the human.
Such, device consists of such component and integrated as a component of a system that automatically performs a task or alerts a user motion in that area.
They form a vital component of security, home control, energy efficiency, automatic light control and other useful systems.
Its module also contain time delay adjustment and trigger selection which allow for fine tuning with your application.
