Q&A for How to Make a Door Alarm

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Question

What is the principle of a door alarm?

Community Answer

Making the circuit closed when the door is opened. When the circuit is closed, the alarm sounds.

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Question

What if I am deaf and can't hear a doorbell?

Community Answer

Instead of a buzzer or door bell, connect a small light bulb circuit that will close when the button is pressed. Run the wiring to a bulb that attracts attention, such as a red one.

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Question

How can I install the same alarm design for a desk?

Community Answer

If you have a drawer on your desk, then attach one end of the alarm to the drawer's roof, and the other near the inside handle.

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Question

Will this model work for a burglar alarm?

Bubu639

Community Answer

Ideally, you should have a proper burglar alarm fitted, but this alarm will work if you are inside the house at the time.

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Question

How do I implement this on a window?

Bubu639

Community Answer

If you attach the alarm to the base of the window or a secure section and then attach the string to the handle, the alarm should work.

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Question

How do I make a business out of these machines?

Community Answer

Same way that you would any other business. Pitch your product to the public and try to sell it. It is important to know that there are many things like this in the market so you will have a lot of competition.

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Question

What if I come in and forget about the alarm? And how loud is the buzzer exactly?

Upnorth Here

Top Answerer

The alarm will make noise when someone opens the door, if it has been armed. The buzzer loudness depends upon what type of buzzer you use. They may be VERY loud or only loud enough to "announce" an intruder (like a distant doorbell), as you choose.

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Question

But wouldn't I need to glue it each and every time someone enters the room, and how do I close the buzzer?

Upnorth Here

Top Answerer

No, the string attached to the door pulls out the insulating cardboard, activating the alarm. 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.

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Question

Is a kid able to build this?

Community Answer

Yes, with adult supervision.

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Question

How will the door alarm help?

Upnorth Here

Top Answerer

It will make noise when someone opens the door without first disarming the alarm, alerting you to possible intruders.

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Question

What are the advantages of making a door alarm?

Community Answer

With this alarm, you can be safer from intruders. If someone tries to come into your house, the alarm will go off.

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Question

How do I prevent the door alarm from going off when I enter the room?

Community Answer

You need to reset it after every use. Just don't reset it after you leave the room. If you want to reset it after you leave the room, it's really not a big deal if it goes off. The purpose is to alert you if someone has entered the room so if it goes off as you're walking in, that's fine.

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Question

Can I use a steel cloth clip instead of wooden cloth clip to make a door alarm?

Community Answer

No, because almost any type of metal (except aluminum) conducts electricity.

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