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set up an RF receiver to trigger the door contacts on your apartment building from a keyfob.

I hate coming home in the snow, rain, and fumbling for keys and balancing grocerys, boxes, ect and trying to pull the door open and hold it while I wiggle the keys out.

so I decided enough was enough.

Materials needed

-one channel (minimum) RF receiver , I used a two channel just incase I needed the other one, but I don't.
I got mine from lightobject.com they have all kinds of cool stuff at great prices
- 12v dc transformer
-bit of wire

A multimeter is handy as well but not necessary.

and I used double sided foam tape to stick it to the wall

As far as I know this will only work on an older style door system thats all analog.
if your front door just has a row of buttons to call each apartment it will probably work.
If you have a newer system that calls your phone it wont.

Step 1: Tone Out the Wires for the Door Contacts.

My building uses a 5 wire intercom system, there is 5 wires which are daisy chained from apartment to apartment.

To determine the proper wire combination i first used the multimeter to determine the state of the switch that opens when you pick of the phone. in order to trigger the door control module the switch must be closed momentarily.

Then i used a jumper wire from what i presumed to be the common control wire, and while holding the phone up to my ear i touched the other end of the jumper to the rest of the terminals until i could hear the magnetic contact at the front door buzzing.

In my case , terminals 6,11,10 are the common, and 9 was the door contact. The rest are voice and call wires.

The receiver i used was two channel, however only one is needed.

Because the door contact switch just triggers the controller all we need to do is to pulse the output
momentarily closing the contact which triggers the controller to hold the door magnetic latch open for the set duration of time.

I changed the jumpers on the board to momentary output so that when i press the button on the remote the relay closes just for a second and triggers the controller downstairs

Step 2: Wire and Test

once the contacts are known its just a matter of hooking up the two wires to the phone and running them back to the controller

my red one was the common to the phone and ran back to the relay's common output. the black wire or the door contact wire went back to the normally open contact on the relay.

then i just stuck the wires on for power and paired the remote to the base as instructed by the manual that came with it.

Finally the test, pick up the phone and pressed the button on the remote and you should hear a satisfying buzzing sound.
Go down stairs (bring your keys just in case) go outside and try it from outside.
As a note the company claims a 200M range, I was skeptical if It would work in my building because of the concrete but im on the third floor and it works great.




<p>Stuie I was just searching something like that as I also have the same intercom (Urmet 1130). As I'm complete noob :) can I ask you what needs to be routed on terminal 9 if I just want the buzzer to automatically open the door without using RF.</p>
For those interested, this relic of an intercom is an Urmet 1130. <br>I'm designing a microcontroller buzz-pattern detection system for mine! ;) <br>Cheers!
I have the same &quot;telephone&quot; for opening the main door in my house...I will use your idea to make the same thing.....thanks....Very simple, easy, and convenient &nbsp;
Clever and well done. Wish I had this at my old apartment. Thanks for the info on lightobject.com - really cool.
I like it! Good work!!!
wow, this is so totally cool. It would be even cooler if I could figure it out! lol, not that you did a bad job, I'm just 17 years old and not too sure if I could do that lol Nice work!

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