Electric Door Alarm Circuit

The circuit working when stick switches s1 at the door which in usual time switch still pressed.

Electric door alarm circuit.

You can attach alarm contact sensors to any door or window in your house or apartment and when armed you ll get instant alerts on your phone and tablet whenever they open. Fix the hall sensor at the corner of door frame and the magnet on the door keeping its north pole n oriented towards the sensor. Align the sensor and magnet such that when the door is closed the output of the hall sensor is low. The ring alarm contact sensor expands your ring the ring alarm contact sensor expands your ring alarm and adds an extra layer of security to your home.

When we forget to shut the door. For sensing the door position different types of methods can be used such as magnetic light beam mechanical electrical etc. But if somebody opens the door the circuit is opened and electricity can t flow. This triggers an alarm.

We do not shut the door switch. We will use a knife switch in conjunction with a 10kω resistor the 2 of these components form a voltage divider circuit. Electrical circuits are used in a wide variety of technological innovations from television sets to windshield wipers escalators to telephones. To stop the alarm you need a different piece of cardboard or a switch to disconnect the battery but to re arm the alarm you simply replace the cardboard insulator which is attached to the string that is attached to the door by clamping it between the wires in the clothes pin.

Assemble the circuit on a general purpose pcb and enclose in a suitable case. In a closed circuit system the electric circuit is closed when the door is shut. This is a door alarm circuit uses to warn. The 9 volts that are supplied to this circuit are in parallel with the 10kω resistor and the knife switch with the gate of the scr being connected to the middle of.

Forget door alarm circuit. And the alarm remains on as long as the door is kept open. The circuit works off regulated 5v dc. This means that as long as the door is closed electricity can flow from one end of the circuit to the other.

The circuit will emit a warning sound from a loudspeaker hear immediately. This resource is useful for introducing components of engineering design ets from the next generation science. By using a switch stick at the door. The schematic for the door alarm circuit is shown below.