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:
“till disproportion’d sin
Jarr’d against natures chime, and with harsh din
Broke the fair musick that all creatures made
To their great Lord, whose love their motion sway’d
In perfect Diapason, whilst they stood
In first obedience, and their state of good.”
—John Milton (1608–1674)