Comments on: Design Challenge: Hung Jury

By: Garage Door Repair Man

Garage Door Repair Man — Thu, 23 Oct 2008 20:18:17 +0000

One Question? Why?

By: johnny

johnny — Wed, 21 May 2008 02:59:01 +0000

I was wondering how to use these programs submitted by the two people? I’ve also been looking for the source code for hacking the garage doors

By: LookitzrYAN

LookitzrYAN — Fri, 28 Dec 2007 09:10:44 +0000

http://www.youtube.com/watch?v=v9EQqKh2IKg
What kind of cracking software could i use to take this technique?

By: mb3k

mb3k — Wed, 04 Apr 2007 11:10:32 +0000

Also, I checked out the BOM and found that the 555 timer, the 12-bit counter, and NAND have supply voltages of about 5V. The problem is that there isn’t any handy 5V batts around. I’m thiking of just addding a 1k resistor right after the +’ve terminal to reduce the voltage to 5V (assuming the current draw from the datasheets come out to ~4mA).

Can someone confirm the required voltage for the circuit?

By: mb3k

mb3k — Tue, 03 Apr 2007 08:13:13 +0000

Anyone know what LSP11 is for?

By: jimmythecow

jimmythecow — Mon, 05 Mar 2007 11:26:23 +0000

where would i go to get this silk screened onto a PCB board for me? I would LOVE to build one, but dont have the skills to make one myself. I can solder everything, thats not the issue. its just the traces I cant do.

thnx in advance to anyone who can help!

By: rapidroy

rapidroy — Thu, 15 Feb 2007 22:23:20 +0000

Electronics beginner here:

What voltage controls this? It appears to be 16 VDC, but can’t quite tell in the schematics. Also, what are the values of C1 and C2?

By: morcheeba

morcheeba — Tue, 13 Feb 2007 19:06:57 +0000

I forgot to mention… garage door openers are long-term investments; they only get upgraded when very broken. Go to an older neighborhood, and I’ll bet 50% aren’t using the rolling codes.

By: Propeine

Propeine — Tue, 13 Feb 2007 18:17:57 +0000

my bad i was referring to number 8 “steve” sorry for the confusion and no disrespect

By: dantronic

dantronic — Tue, 13 Feb 2007 18:15:52 +0000

I can see the hangup, you’ve got one gadget (garage door wedge) that LOTS of people can understand ONE use for, and another gadget (mega something something) that ONE person finds LOTS of uses for… don’t get me wrong, if the jury comes ’round to MY workbench, I’d be hardpressed to describe an actual “use” of any of my creations… just sayin, to each his Leatherman.

But it is a dilemma that divides the soul of HAD: Dutiful Outfitter of Rare Knowledge -or- Welcoming Instigator of Faithful Involvment

By: khanzerbero

khanzerbero — Tue, 13 Feb 2007 17:19:36 +0000

i actually submitted it!

http://www.hackaday.com/2007/01/02/dc-entries-lvp-logic-probe-and-a-wireless-antenna/

the antenna is usefull i connects to the wifi card and its an improvement over the builtin antenna in some cards.

and its actually first of its kind as you will never find anything like it. normally antenna shape is dictated by the function, in the submission function & artwork are blended to form my submission.

By: Terry

Terry — Tue, 13 Feb 2007 07:50:16 +0000

I’ve built these garage door opener tumblers in the past. There are a couple additions I thought of but never made (laziness and liquor prevailed)…
* Some LED’s inline with the transistors will give a binary readout of the code. Obviously the tumbler will move past the valid code by the time the door starts to raise but it should be close enough to give an approximation of the code to use. If you put a spst button on there to stop the code from rotating you can read the value then work backwards.
* It’s hard to know how fast you can step through the codes while still knowing the door will open when you get the right one. A way around this – wire 4 universal remotes together. Hardwire the two most significant bits to each combination then slowly work through each step. It’ll try 4 combinations at once.

By: morcheeba

morcheeba — Tue, 13 Feb 2007 06:33:17 +0000

Eurisko - Older garage doors (2003 sounds like a good cutoff date) use a single 8-10 bit code. It's ok security, but can all possible combinations can be cycled through quickly (like this entry).

To fix this, you might want to increase the number of bits so it would take longer to guess... but that doesn't offer any security to people who can record the key over-the-air when you press the transmit button.

To combat that, rolling codes where developed. The code changes each use (so simple recording won't work), and it's hard to predict the next valid code (so that recording + a little processing won't work). Here's a good explanation: http://auto.howstuffworks.com/remote-entry2.htm

Also google keyloq for technical details.

By: Propeine

Propeine — Tue, 13 Feb 2007 03:34:47 +0000

To post #2, I have another design that allows you to start at a certain point rather than at 0.

To post #3
I knew I saw this somewhere before, thanks for digging that up. I remember it from years ago but can honestly say this is from my own devise.

To post #6 the newer style garage door openers using rolling codes that change everytime the button is pushed, there are like 30 possible codes that can be used at any one time but its out of 128bits or something like that. Sure you could brute force it still but it would take days.

to post #9
Maybe you should have submitted something then instead of complaining about other people's submissions. I never said mine was the first of its kind. While numerous hacks have little real world value, how many hacks actually do? Whens the last time you needed a webcam controlled airsoft gun?

By: khanzerbero

khanzerbero — Tue, 13 Feb 2007 02:11:40 +0000

you can check at my design entry i think its cool
its a wifi antenna. the logo is the antenna itself!

http://foro.colombiaunderground.org/index.php/topic,2236.0.html