Conclusion
While building the mechanics and tuning the electronics took me longer than
expected, the result was really nice: all the hardware neatly fit on the inside
of the door, without using screws or nails or anything else that would damage
the door. I used gaffer tape to make sure the device stays in place, but that's
more a security measure than a neccesity.
The device works quite well, too: I've made a quick movie to show it off. The only problem is that opening the door assumes that you can keep a rythm in your knocks, and unfortunately, the people in the flat where it's installed don't all seem to be musical enough...
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Wouldn't it have been easier to just lose a key (& 25 euro). But then again they probably didn't want to pay 25 euro for an extra empty room. Might the lock-picking include walking outside on a small rim from the room nextdoor ?
Thats cool, only what if the landlord comes with keys to look inside and sees the whole contraption? You might just force the lock and put in your own, same result, much easier, and you can tell the lord you know nothing about it, make him think he messed up with the keys :)
very cool!
Nice hack, one way to counter the rhythm of the flat mates is to do the same thing fingerprint security does, and have a close enough is good enough method. I like how you just chuck things together and tinker to make it work
wow. thats really cool.. but is it necessary to do this in assembly?. can we do this in C programming?
great and Beautiful
HI ,THANK AND YES TO MORE
I like it. The door looks fairly lightweight - probably some hollow honeycomb. It should be possible to use a magnet and reed switch arrangement, too.
you should eliminate the knock sensor and use an automotive keyless entry !
hey i have a question. where can i buy those ATtiny? and can you explain me exactly how to put that firmware on the ATtiny2313? answer me at: rickvanoosterhout@home.nl thnx
brilliant!!!!!
Neat-o! i would store all the dirty money, drugs, guns and hookers there ^_^
I agree with troy.
wow theres alot of resentment in the comentary here. i dont understand why people would come to view this if they dont agree on it, much less comment. it takes less effort saying nothing than that of getting mad aobut it. just appreciate the technology that these people have created. i really dont see any of the ass holes who condesendingly comment on this page with any cool hack ideas.
If there's a gap, instead of knocks use an IR detector and a TV remote. Won't have to worry about keeping tune then.
Beautiful. Truly.
I like it but,what happens if the owner of the house opens lock with his key. it's cool project with which we can develop new ideas..
=) i want one of these :'(
I think you should read Ronnie's note of 15 Jun 2007, 11.55 and Markuslarkus' note of 15 Jun 2007, 5.40.
It would be really nifty to build this into the doorframe, so that it isn't visible from either side. When you remove and disassemble the lock insert you will find that there is plenty of unused space. It might be possible to insert the electronics and a small, slow motor with a good transmission ratio into the metal casing while keeping the original cylinder of the lock.
Dude you should make those and sell them
Very cool hack, but would think it would be much more practical just to spend your energy making a key?
Nice, I'll keep something like that in mind. Might build one into my new bedroom door, after I break this old one.
There is also a kit for autos when you forget your key - or want a keyless entry http://www.knockinkey.com.au
Brilliant! I've always wanted to do this with RFID, which I think would be more secure, but you've provided a schematic with printer motors and rubber bands for it to happen. Thanks!
I think there is a problem with transistor T2
What happens when the landlord comes and opens the door with his key? Who will get kicked out of his apartment then? (Hint: you) Nice hack though.
Cool hack, but not very legal. If the landlord has reason to lock the space, it's not yours to open. If you think it's no big deal, why not ask the landlord to rent the space for a few bucks extra?
Nice work! The whole T2 being upside-down thing... it's working as an emitter follower into a high-impedance load so it won't make much difference (transistors are notionally symmetrical [NPN], but messed with so they have a higher current gain when connected 'correctly')...
Nice hack again. I'd consider using protection diodes across the FETs/coils, though - to protect the FETs from the backfiring induction spikes.
"but closing an empty room for no apparent reason isn't really ethical too, in my opinion" Sorry, but that's so idiotic and juvenile I can't really get past it to your circuit. Maybe when you're old enough to own some property of your own you'll have a different opinion.
how fucking cool is that, hugh?! would be nice to see is winding from the other side, like boob and rob already noticed. nice work, so far.
I would like to see the video from the rear to show it all moving.
I doubt it. If you're so smart how come we can't see it in action.
As an EE I 1) think that's the best schematic I've ever seen & that's mostly becuase of the tm'd software name & 2) I appreciate the use of tape in electronics projects, it's a must.
pretty crude, but nice enough.. very resourceful, and.. uhh.. hey how the hell were you able to program in assembly? It's a bad thing's there's no such things like that at our area.. xD
That's off the fucking chain!! Nice work.
Nice work.
Hope the Landlord dont call the bombsquad ;) nice work
It may not be a first but it does make the task of building this device seem much more doable. Definitely a nice thing to have around. I'll keep it in mind for my dorm room.
Neat, but not a first. http://www.nokey.com/knocknoctoac.html http://www.knocknlock.com/ http://www.isracast.com/Articles/Article.aspx?ID=3
Really nice idea! you should post up a set of instructions on how to make something like this!
I actually had an idea similar to this which would use a remote control, the schematic you have will help me out immensely, thank you, very nice work
(00| 1 w0u|d ju57 u53 4 P1( 8u7 571|| (00| hey how about you try putting the chip in the case and extending the button out with one of those radio shack ones that screw in the cas3
Wlol, I'm gonna brute my front door 4 this!
omfg, cool, lol ;)
At a university that I went to there was an elevator that led to access to nuilding attic the roof of the science building. The roof was a great place to hang out, watch the sunset, drink beer, etc. (I'm sure the Dutch know what etc involves). The elevator required a key to get to the attic/roof and was not to be had. They key turned a switch which triggered the elevator. One night, we removed the panel covering the buttons/key switch, wired a magnetic reed relay to the key switch (with the wires having a plastic clip on them with an official looking wire/circuit number stamped on it) and taped the reed switch to the back of the elevator walls. You just had to stick a magnet to the right place of the elevator wall and voila! Roof access. After 30+ years and a couple of building remodels and elevator refurbs and who knows how many service jobs on the elevator, the magic hack still works!