When it comes to home security, CCTV (Closed Circuit Television) may not be what you’re looking for. You may want something that’s less evasive, but is still affective at perturbing an intruder. This is when you decide to have a burglar alarm. These systems are usually quite simple and will be set off by a door, or window opening or closing – depending on the set up of the system. This works by creating an electrical circuit within the door/window frame. When this circuit is broken, it triggers an alarm. As we mentioned, the alarm could trigger on opening the door, or on closing the door. You can even make the glass itself a circuit, so that if the glass is broken the circuit is broken which triggers the alarm.

This is a similar mechanism to pressure sensitive alarms for example in floors; the alarm is triggered when there is an increase, or decrease of weight/pressure.