Alarm and Sensor Technologies

Overview of Alarm Technologies

Sensors

• [Passive Infrared (PIR)

This type of sensor is used to protect inside and outside spaces by watching for changes in radiated IR.

• • Does a good job of detecting any type of motion by warm bodies
  • Inexpensive and widely available
  • Is vulnerable to false-alarms or deliberate attempts to set it off
  • Wikipedia article on PIRs
  • [EEVblog teardown of a PIR http://www.eevblog.com/2012/05/09/eevblog-275-pir-sensor-teardown-tutorial/]