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How can I build an door alarm that sends a signal wirelessly to buzzer maybe 30m away when the door is opened? Answered


I need to hear the front door open from quite a way away and I can't really run wires all the way. The signal would need to travel wirelessly from the front door of my business to the buzzer at the other end of the premises.I can't seem to buy a pre-made version nor a kit for this anywhere! Would there be a way I could use a kit with a reed switch ie magnetic sensor on the door but somehow wire it to a transmitter instead of a buzzer? Then I'd need a receiver connected to a buzzer I suppose.  I've no idea really where to start.

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Wolf Seril

Best Answer 8 years ago

I would try wiring the magnetic sensor to a wireless doorbell (the button part), and have the bell part to where you need it. It should be pretty simple but I can't be sure without seeing your parts.

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LydbootsWolf Seril

Answer 8 years ago

Hi Wolf Seril
I think that sounds like what I'd want to do ... somehow!

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steveastrouk

8 years ago

Here in the UK Friedland sell remote doorbells for about 20 quid.
Short of that, I can suggest some suitable bits and pieces. Where are you in the world ?

Steve

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Lydbootssteveastrouk

Answer 8 years ago

Hi Steve
I'm in Sydney Australia. I haven't found one here that does what I want. Not a doorbell (that someone presses) but a door alarm that goes off automatically when the door opens.
Lydia

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evasdaddyLydboots

Answer 6 years ago

This is what you want:

http://www.chamberlain.com/doityourself/pages/productmodeldetail.aspx?modelId=1863

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steveastroukLydboots

Answer 8 years ago

I'm surprisd there aren't such things in Oz !

Steve

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Lydbootssteveastrouk

Answer 8 years ago

Me too! When I asked at Jaycar (a sort of Electronics DIY store) they said "people ask for something like that all the time but we don't have one"!

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steveastroukLydboots

Answer 8 years ago

Lydia,

It looks like you had the village idiot in the shop.

http://www.jaycar.com.au/productResults.asp?keywords=doorbell&keyform=KEYWORD&SUBMIT.x=0&SUBMIT.y=0

Steve

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Lydbootssteveastrouk

Answer 8 years ago

It's no good Steve! thanks for the link BUT
I obviously haven't explained myself - I don't want a door bell!
I want an alarm that sounds when the door is opened (a warning to me that someone has entered) & I want that bell/alarm to be quite a distance away from the door so that it doesn't deafen the customer but if I'm out the back I can hear it.
Does that make sense now?

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steveastroukLydboots

Answer 8 years ago

Its the same thing: Mount a button OVER the top of the door: As it opens, the door presses the button, as it closes it presses the button.

Steve

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Lydbootssteveastrouk

Answer 8 years ago

Now that's a cool idea. Most doorbell buttons aren't raised & the buttons have to be pressed in but maybe I can find one that, mounted on the door frame can survive the edge of the door scraping across it frequently

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Lydbootssteveastrouk

Answer 8 years ago

OK - but can you explain how I'd do that please?

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Lydbootssteveastrouk

Answer 8 years ago

I think this takes me back to my original question!
"a reed switch ie magnetic sensor on the door but somehow wire it to a transmitter instead of a buzzer?"

So do you think if I bought a wireless doorbell & a magnetic sensor I can somehow connect them?!

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Re-designsteveastrouk

Answer 8 years ago

I agree. Radio Shack sells one in the US that I use in my office.

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evasdaddy

6 years ago

Here is what you are looking for. Available at Radio Shack.

http://www.chamberlain.com/doityourself/pages/productmodeldetail.aspx?modelId=1863