Just imagine what a burglar might do to break into a house, and then turn that action into the circuit switch. Using this basic concept, you can create all sorts of alarm systems. For added security, the control box is usually positioned in an out-of-the-way spot, so the intruder can't find it and attempt to destroy it.
Intruder alarms code#
But once the alarm is triggered, the control box won't cut it off until somebody enters a security code at a connected keypad.
It monitors the circuits and sounds the alarm when they are closed or opened (depending on the design). The control box is hooked up to one or more alarm circuits, but it also has its own power supply. That's why most modern burglar alarms incorporate another piece into the circuit - the control box. After all, the burglar only needs to close the door again to turn the buzzer off. With just a battery and buzzer, these designs make for fairly flawed security systems. When somebody opens the door, the button is released, changing the circuit and sounding the alarm. The button is embedded in the door frame, so closing the door pushes it in. If an intruder pushes a window open, the magnet slides out of line with the switch, and the buzzer is activated.Īnother simple burglar alarm uses a small button as the switch. You can also build this sort of system into a window. This cuts off the current and closes the relay, sounding the alarm. When you move the magnet by opening the door, the spring snaps the switch back into the open position. The current powers the relay's electromagnet, so the buzzer circuit stays open. When the door is closed, the magnet pulls the metal switch closed so the circuit is complete.
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