Comments on: Knock detecting lock

By: Ashley Trowell

Ashley Trowell — Tue, 25 Oct 2011 03:53:41 +0000

Very good idea. If you imagined a 3×3 keypad on the door, you could use rhythm and position to have pretty good security, even with the neighbors listening. We have a similar system where I work for detecting the spread of bullets from machine guns. We have a target with metal bars along the bottom and left sides. Both bars have a piezoelectric sensor at each end, and the shockwave from the bullets sends vibrations through the bars.

You could also have a automatic formula for changing the position pattern depending on the day of the month and the hour of the day.

By: Tercio

Tercio — Thu, 05 Nov 2009 17:31:19 +0000

Ow… very cool! This is very creative lock circuit.
Great!

By: Philadelphia personal injury attorney/lawyer

Philadelphia personal injury attorney/lawyer — Thu, 05 Nov 2009 15:38:03 +0000

Pretty cool. I also don’t know how those suction cups are holding that up, but I like the device.

By: Iv

Iv — Thu, 05 Nov 2009 09:31:30 +0000

so anyone who hears the knock can then enter without breaking anything ? That includes neighbors, people you let in and people with a directional microphone…

It is a bit like a digicode where you would be shouting the code each time you want to enter

By: tehgringe

tehgringe — Wed, 04 Nov 2009 23:19:57 +0000

I like…the bit about the suction cups is not important as someone already mentioned, because I finally version would be fixed.

I think that I would rather have something digital broadcasting using a key fox, but something secure and encrypted, but I’ve only started playing with the arduino so I don’t know how it would cope with encryption.

By: Jack Sprat

Jack Sprat — Wed, 04 Nov 2009 21:44:45 +0000

Interesting device, if he uses three sensors, he could also require you to knock on a certain spot on the door.

By: rooftop ridicule

rooftop ridicule — Wed, 04 Nov 2009 21:44:08 +0000

good post Caleb don’t let people give you schit

By: K

Wed, 04 Nov 2009 21:23:31 +0000

If I or another normal person used this the knock would be pretty simple but there are some guys I used to know for whom this could actually be secure. They loved to freestyle (rap) and would pound out beats on the desk for each other. Some of them were pretty complex. Even so, I wouldn’t use it for anything I really wanted to keep secure.

By: Wwhat

Wwhat — Wed, 04 Nov 2009 20:15:57 +0000

Nice, and nice presentation in that video.
I know the suction-cups are not going to last, but you can affix it how you want of course, this is more for portable presentation I guess so I for one look past that.

By: Matt

Matt — Wed, 04 Nov 2009 19:32:19 +0000

And of course, the surface has to be very flat and smooth.

A light coat of mineral oil on the suction cup will also help it hold.

By: Roland

Roland — Wed, 04 Nov 2009 17:22:11 +0000

“We’re a bit surprised that the suction cups actually hold it on the door. Maybe it’s just us, but we can never seem to get those things to hold very well.”

Get some dishwashing soap. Clean the surface you wanna put it on and clean the cups. let it dry and don’t touch on the surface. Take your tongue (or much better: a damp sponge) and wipe over the cup. Press it down – et voila.
Most people don’t care about really cleaning the surfaces, so it doesn’t hold well. Same people that say Second adhesive never works for them… clean (and i really mean: get rid of all fat sitting on your surfaces) and glue and you will never get it apart again…

By: Shadyman

Shadyman — Wed, 04 Nov 2009 15:46:18 +0000

robomonkey: It would be fun if you just pressed the program button quickly to open/lock the door, and held it down to program.

It may be one of those doors whose deadbolt unlocks when you turn the door handle from the inside.

By: robomonkey

robomonkey — Wed, 04 Nov 2009 15:42:49 +0000

how do you turn the knob when you want to leave if it’s attached?

By: chicosoft

chicosoft — Wed, 04 Nov 2009 15:26:52 +0000

Thats cool… a litle insecure, but cool :)

By: ham sandwich

ham sandwich — Wed, 04 Nov 2009 15:24:24 +0000

If only I had that for my club house as a kid!