PIR-based Motion Detector
A PIR-based motion detector is used to sense movement of people, animals, or other objects. They are commonly used in burglar alarms and automatically-activated lighting systems. They are commonly called simply "PIR," or sometimes "PID," for 'passive infrared detector'.
Read more about this topic: Passive Infrared Sensor
Famous quotes containing the word motion:
“If we shall stand still
In fear our motion will be mocked or carped at,
We should take root here where we sit, or sit
State-statues only.”
—William Shakespeare (1564–1616)