Electric Door Alarm Circuit

The circuit will emit a warning sound from a loudspeaker hear immediately.

Electric door alarm circuit. Assemble the circuit on a general purpose pcb and enclose in a suitable case. The circuit works off regulated 5v dc. When we forget to shut the door. 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.

This triggers an alarm. 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. 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.

And the alarm remains on as long as the door is kept open. This means that as long as the door is closed electricity can flow from one end of the circuit to the other. Hendun wireless door alarm with remote windows open alarms home security sensor pool alarm for kids safety prevent robbery 2 pack 4 4 out of 5 stars 547 22 99 22. 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.

In a closed circuit system the electric circuit is closed when the door is shut. 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. A door opening alarm circuit is an indicator or a security alert device which activates while opening the device attached door. In this video segment adapted from zoom cast members use electrical circuits to create door alarms out of a variety of materials.

For sensing the door position different types of methods can be used such as magnetic light beam mechanical electrical etc. Align the sensor and magnet such that when the door is closed the output of the hall sensor is low. The schematic for the door alarm circuit is shown below. The circuit working when stick switches s1 at the door which in usual time switch still pressed.

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. By using a switch stick at the door. This resource is useful for introducing components of engineering design ets from the next generation science. But if somebody opens the door the circuit is opened and electricity can t flow.