Intercom Keyless Entry

May 13, 2007

Here is a crafty hack that converts a normal building intercom into a personal wireless keyless entry system.
Video after the jump.

“Now don’t tell the co-op board, but I crafted a plan to ditch my Mul-T-Lock key for good. My apartment building, of course, uses an intercom system to remotely unlock the front door for guests, deliveries, etc. This keychain upgrade gets me in the front door… keylessly.

The mechanism is simple enough, just a momentary button on the panel in my apartment, but the mess of wires in the wall is a little unsettling. I took some meter readings of the terminals and sorted out the door button wiring. You can see where the door button is soldered through the PCB, which made it easier to identify the proper terminals. This panel has a “Door”, “Talk” and “Listen” button. The “Door” button is normally-open and the circuit is about 22V. In the following steps we’re going to effectively bypass the button with our own circuit.”

Thanks Ryan.

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7 Responses to “Intercom Keyless Entry”

ryan Says:
May 13th, 2007
did i do something?!?!?!?!?!?!
Kevin Says:
May 13th, 2007
There is more than one Ryan on this earth.
ryan Says:
May 13th, 2007
i know i know thers like 4 on my street
Alan Parekh Says:
May 13th, 2007
LOL, ya it was a different Ryan.
ryan Says:
May 13th, 2007
k, i din’t want to be blamed for somtehing….
bubba Says:
May 15th, 2007
nice, especially because buzz-in those things are notorious for random failure, so you’ll be locked out some day
Mohd. Hashim Khan Says:
May 25th, 2007
Warranty void if removed