[Ryan] sent in his simple but effective keyless entry hack for his apartment. Many shared apartment buildings have doors that allow residents to buzz visitors inside. He interfaced a keyless entry remote with the entry button on his intercom system. Press the button and voila – open sesame. It’s almost a head slapper because it’s such a simple hack, but sometimes those are the best.
In my old apartment i wired up a relay to the buzzer.
when the buzzer went off the relay closed the circuit to the door release.
Secure? No.
Convenient? Yes.
No more standing in the rain or snow trying to get the keys out.
The board had over 50 buttons on it so the odds that someone would notice it was pretty low.
As far as i know its still installed. :)
Posted at 6:51 am on May 13th, 2007 by PeterJ
fantastic, a nice simple hack is always appreciated. Its good to mention a few ideas like these as they are often things people just gloss over
Posted at 7:39 am on May 13th, 2007 by Apothus
Smarthome has a secure relay. been using it to buzz my door open for over a year.
http://www.smarthome.com/7446wa.html
Posted at 9:52 am on May 13th, 2007 by destroyer of evil
Now why did I not think of posting my version for the past 2 years !!
Yup it’s convenient
Posted at 11:49 pm on May 13th, 2007 by Aldeeb
I made something similar 20 years ago out of a VIC-20 and a couple relays. I hooked it up to the intercom so that when you pushed a specific pattery on the button downstairs (i.e. short, long, long, short) it would automatically buzz you in. No remote needed!
Posted at 9:29 am on May 14th, 2007 by Scott
hello frind
Posted at 3:46 am on May 19th, 2007 by behzad
I think this keyless entry is pretty sweet, but keep in mind someone else might have alterior motives when making one, so you still might be better off with old fashioned security, or at least have a gun in your place just in case.
Posted at 2:15 pm on May 24th, 2007 by Michael I.
If the phone has forwarding, you can just link it to your cell phone and buzz yourself in. No wiring required.
Posted at 5:54 pm on May 24th, 2007 by darkness
Build something similar, but upgraded it to a system that responds to a specific tune (morse) played on the doorbell =) It uses an AVR and some relays, powered by the doorbell and is housed inside the intercom. A short pulse activates it, while normal use of the doorbell is still posible. Dipswitches give me the option to use any 8 pulse code (choose between long or short). If the code is correct, the door opens for 5 seconds, when wrong, nothing happens. Very conveniant if you forget your keys or they are ’somewhere’ in your backpack.
Posted at 1:22 pm on May 29th, 2007 by ErikH
This is a very simple solution, although it seems to provide no real security. I would advise looking into a remote control encoder/decoder with strong encryption.
http://www.linxtechnologies.com/Products/Integrated-Circuits/HS-Series-High-Security-Encrypted-Remote-Control-Encoder-and-Decoder/
http://www.digikey.com/scripts/DkSearch/dksus.dll?Criteria?Ref=169376&Site=US&Cat=34735062
Posted at 12:24 pm on Jun 25th, 2007 by sudo
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heh, i think i need to mod my doors with this. wOOt first post.
Posted at 2:16 am on May 13th, 2007 by xurious