DIY: Keyless Residential Entry

posted May 31, 05:53 AM by Puffo

A great article on how to build a system that lets you unlock your apartment complex door wirelessly. It’s a very slick read with lots of pictures and ideas.

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.

[ Via DIY:happy ]