Sensors for home security systems

Sensors are used to check for disturbance such as movement and heat change in an otherwise "quiet" environment. When there is a change in the environment, the sensor is triggered causing it to send a signal to the control panel.
 

Sensors are essentially magnetic switches that trigger the alarm whenever a door or window is opened. One part of the switch is installed on the door or window frame; the mating part attaches to the door or the window sashes. When the unit is opened, separating the parts, the interruption in current triggers the alarm.

• Conventional sensors
  This type of sensors uses detection method that is simple and not so sensitive to its surrounding. It can be used in almost every house and with very minimal risk of false alarms.
  Motion sensors
  Glass break sensors
  Magnetic sensors
  Smoke sensors
   

• Unconventional sensors
  This type of sensors is more sensitive and may not be suitable to be used in every home. If you plan to use this type of sensors, make sure you are aware of its limitation.
  Ultrasonic sensors
  Microwave sensors