Nov 4 2009I Want One!: A Secret Knock Door Lock
Holy shit, it's a PVC pipe bomb! No, not really. It's the Knock Lock, a homebrew door lock that will only release the deadbolt if you perform the secret knock. Cooooool -- I want one for my clubhouse!
A microphone (okay, really a speaker) presses against the door and listens for knocks. If it hears the right number of knocks in the right cadence it triggers the motor to turn the deadbolt and unlock the door. If the sequence isn't recognized, the system resets and listens for knocks again.
There's a very worthwhile video after the jump of the lock in action. The only problem is every time you perform a knock your neighbors learn how to gain access to your apartment. Still, neat idea. But I'll just stick with my tried and true knock: KICK IN THE DOOR, WAVIN' THE FOUR-FOUR, ALL YOU HEARD WAS GW DON'T HIT ME NO MORE!! I'm serious, don't make me pistol-whip you.
Hit the jump for another shot and the video.
Secret Knock Detecting Door Lock [grathio]
Thanks to EggL, whose door requires a retinal scan plus blood test.
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Reader Comments
1. Shamwow - November 4, 2009 3:43 PM
FRUNST
2. DARDAR - November 4, 2009 3:45 PM
YES! FIRST
3. GoSS Jerk no longer sterilized for your pleasure - November 4, 2009 3:46 PM
i hate my firewall...
4. GoSS Jerk no longer sterilized for your pleasure - November 4, 2009 3:47 PM
i hate firstards more than my firewall... i hate firstards more than RDA and bathcaptain, i HATE firstards more than Robots
5. chris - November 4, 2009 3:49 PM
Seems like it would be easy to break into.. I LIKE IT!
6. GoSS Jerk no longer sterilized for your pleasure - November 4, 2009 3:50 PM
ok, looks like the thing is attached with suction cups (or watever the hel you call them, so if im out for a couple of days chances are the things fallen off the door and i cant get in anyway... cool for a tree house with no walls though
7. Pat - November 4, 2009 3:51 PM
Definitely looks like a pipe bomb.
8. Jazzman - November 4, 2009 3:52 PM
@ GW - lol @ "KICK IN THE DOOR WAVIN' THE FOUR-FOUR" You kinda hood son!!!
9. ~☻,_∫∫ ∕∕-][ Ỵ ([¦¦ ([]) ][-¦¦ ☻~ - November 4, 2009 3:56 PM
yea I've made a few things like this but mine was a auto barricade one of my first patents dropped a steel bar the millisecond someone attempted to breech the door
10. Hayley - November 4, 2009 3:58 PM
The dude presenting looks like a robot covered in skin.
11. JADE - November 4, 2009 4:00 PM
And what about that crazy ass neighbor that watches with binoculars......he will see you doing the secret knock then come in and rape you.....then what? Not so cool then huh?
12. Dirty-Shizno - November 4, 2009 4:02 PM
Death, be all but proud, though some have called thee mighty and dreadful. I am Legion for we are many...
13. Closet Nerd - November 4, 2009 4:02 PM
If you like Biggie, check out "Blue Eyes Meets Bed Stuy"... its a mash-up of Biggie & Frank Sinatra.... even better than Danger Mouse's mash up the Grey Album (Beetle's White Album + Jay-Zs Black Ablum).
14. Dirty-Shizno - November 4, 2009 4:03 PM
lol what does that even mean and why does he say it
15. wes - November 4, 2009 4:08 PM
looks like my penis
16. STOMPY (wants your mario kart friend code) - November 4, 2009 4:09 PM
thats nothing, the locks on my house require a secret knock while have a retinal and handprint scan with voice recognition and than enter a 36 code while simultaneously turning 15 keys while saying the elvish word for friend
17. naas - November 4, 2009 4:25 PM
it's long pipe dong with a circuit board on his head
18. greenman - November 4, 2009 4:29 PM
I'm impressed.
19. rednexaal - November 4, 2009 4:34 PM
what if it ran out of batteries
20. notorio - November 4, 2009 4:38 PM
hahaha @ GW, biggie FTW
21. matt - November 4, 2009 4:52 PM
hey dummies, you wouldn't keep it on the door if you were already in the house, unless you were waiting on your fellow treehouse buddies to get there.
I like it. I'll take a million.
22. dave - November 4, 2009 4:54 PM
happy birthday to you indeed my friend.
23. Hayley - November 4, 2009 5:01 PM
I'm going to get one, and program it to open only to a knocked out version of Zelda's Lullaby (that's right bitches, the medley - not the 3 note version). Though this will take up approximately 7 minutes of my day, multiplied by at least 3 exits/ entrances is almost half an hour, it will be worth it as no one will have the faintest idea of how (or persistence) to copy it.
Except that I just wrote that on the interwebs. With all tha spyz.
Damnit.
24. ciao - November 4, 2009 5:08 PM
If they knock wrong, or jerk the door knob it should give em' a shock. >:D
25. shitzangiggle - November 4, 2009 5:17 PM
@16 haha your lock doesn't include the penis scanner that means anyone could easily get in...
26. Bob - November 4, 2009 5:22 PM
I think the door should blow up if you get it wrong more then 10 times.... Sucks if you just bump into it haha
27. ciao - November 4, 2009 5:23 PM
my dorm door's lock is fairly busted, I pretty much use a modified key or my foot....
the foot is the key to all things in life.
28. Squidly - November 4, 2009 5:41 PM
That's no PVC pipe bomb... It's a wiener.
29. BlackSamTX - November 4, 2009 5:42 PM
definitely modeled after my cybertronic wang...
30. letsdoit - November 4, 2009 5:51 PM
Second!!!
31. knarf - November 4, 2009 6:21 PM
I want one!
32. VERONICA - November 4, 2009 6:24 PM
OMG I ACTUALLY KNOW THAT SONG!
33. Pete - November 4, 2009 6:44 PM
WANT!
34. AtomicCoffee - November 4, 2009 8:08 PM
I wonder if you can unlock it with a shotgun?
35. Adam - November 4, 2009 9:24 PM
Wouldn't anybody who heard the knock know the password? Isn't it easier to listen than it is to watch someone enter a code or steal a key?
36. LC - November 5, 2009 4:59 AM
It looks like a wiener.
There, I said it. Now we can all stop thinking about it.
37. Ebee - November 5, 2009 7:09 AM
I would not take that out in my front yard and walk around with it in my hand, i think someone would call the cops thinking this was a bomb. How funny would that be to try to explain to the police no sir officer i swear it is not a bomb it is a secret knock door lock.
http://www.ShopStunGuns.com
38. Jaded Icon - November 5, 2009 11:15 AM
Eh...I still prefer my string, weights, counter weights and shotgun...
39. cabbo - November 5, 2009 11:27 AM
Mine will be set to open only when the person bashes their skull on the handle.
40. cabbo - November 5, 2009 11:32 AM
It doesn't have a handle, does it?
Even better. I'll put a pin board on the door.
41. cabbo - November 5, 2009 11:33 AM
Obviously, I'll have the only key.
42. Naterator - November 5, 2009 7:37 PM
Forty-Seventh!
(small joy)
43. Kyster - November 6, 2009 7:49 AM
I must have one!
Come to think of it, i must have one for each door in the house!
44. graf zeppelin - November 6, 2009 12:40 PM
ok. and then the battery dies.
45. NaKAhi70 - November 7, 2009 5:18 PM
Bill (L4D) I got myself a pipe bom...oh wait don't worry
46. Bodun - November 8, 2009 2:57 AM
Хуйня, программу написать 15 мин
47. OneEyedJackofSpades - November 9, 2009 4:01 PM
#26 I wholeheartedly agree about the blowing up if you get it wrong too many times...