detect any changes in the environment (noise level, vibration, temperature)
PIR = passive infared They detect motion and then activate a switch to turn things on and off
A PIR Motion sensor detects the minute changes in heat and infrared radiation rather than movement.
Pir Sultan Abdal has written: 'Pir Sultan Abdallar'
Passive Infra Red. Units that detect movement.
The population of Pir Alqar is 432.
The population of Pir Mahal is 100,000.
The population of Pir Dezgah is 252.
The population of Pir Samadin is 199.
Pir Yusefian's population is 3,816.
Pir Ghazi's population is 49.
The population of Pir Boz is 1,032.
Pir Sharif's population is 33.