Side Project: Defusable Clock Case Mod

I saw a post on Hackaday about a defusable clock kit. Instantly I fell in love and subscribed to be notified when the clock kit would be available for order from Nootropic Design.

Several weeks later I got the email and right away placed my order. I got it the next day! Unfortunately I was out of town and didn’t assemble it until a few days later. I got the kit all soldered up. I watch my favorite movie, Fight Club, for some inspiration to create my own case for my clock. I ended up watching the whole movie then headed over to Fleet Farm with some ideas in mind.

If you can recall, when the Edward Norton shoots the glass to that one building then enters the parking garage to find a van, opens the doors and finds 400 gallons of nitroglycerin and towards the front of the van there is a box with the timer to detonate the explosives. That’s what I was looking for, sort of.

At Fleet Farm I picked up a 50 caliber metal ammo case, two glass jars that are used for preserving jam or something, two different colors of liquid hand soap (coincidence, not related to Fight Club. I was looking for a liquid that had a lot of color so it would appear more mysterious. Some drain cleaner might have also worked.), some foam insulation that is supposed to be used around air conditioning units that sit in windows.

Right away I filled the jars full of the soap. Then I put the lids back on the jars tightly and wrapped black electrical tape around the bottom of the lid to make it look more like a home made bomb (not that I would know what that looks like, honest).

After, I placed the jars in the case to see how they would fit in there. I put some of the foam in there, make a little mark with my knife then cut it to length. I kept putting in more foam so the jars don’t hit the sides of the ammo case or each other. It took a lot of putting the jars in, taking them out, putting them in, taking them out to get it just right.

I did not drill holes in the tops of the jars because I didn’t want any leakage. I found some small nuts and bolts in the garage. I super glued the nut to the top of each jar in the center by just eyeing it up then let it just sit there while i started working on the next part.

I was trying to figure out the best position to mount the clock kit. Do I mount it on the side, if so, which side? Could I mount it on the top? Should I mount it on the inside? After analyzing my options I decided that mounting it on the largest side with no writing on it. I couldn’t mount it on the top because the handle would have gotten in the way and I didn’t want to mount it on the inside because then it’s no longer a functional clock.

I measured the surface area of the largest side of the ammo case and found where the middle was horizontally. I headed over to my scrap box and found some matching color wires for the screw terminals, altered them to a length that looked good, twisted them together and attached them to the clock kit. I then held the kit up to the side of the ammo case in line with the marks I made earlier to find the middle, made a few more marks for the corners of the PCB and drilled some holes for some screws to hold the PCB. Also, I cut a piece of foam that is about 1/2 inch thick and a litter smaller than the PCB and put that behind the PCB before mounting it to the side of the ammo case. It looks a little better than having the clock flat up against the case and I didn’t want the possibility of 9V running through my ammo case.

After fixing the PCB to the side of the case, I drilled another hole to run the wire into the case where the jars are. Twisted the wires together and screwed them down to the tops of the jars. I ended up having another wire running between both jars. The reason for that is due to the clock kit itself.

There are 4 wires across the top of the clock. You have 10 seconds to choose the correct wire to cut: one wire stops the countdown and saves the day, two have no effect, and one will “detonate” the device immediately. These role of each wire is randomly assigned when the detonate button is pressed, so it’s a new challenge every time.

How I have it wired is that if this were a real bomb (which it isn’t, I’d really like to make that part clear) and you lose the game, no matter what wire it is, it would actually detonate the bomb.

Alright, enough of the chatter. If anyone actually read this whole thing, thank you. For those of you that came here just to check out the pictures, I don’t blame you. It seriously looks deadly:

                                    I did find out that the jars are just a bit too tall for the case and I still can latch it, but I’m afraid that it will shatter the glass then I have soap all over the damn place. So I leave the top cracked open a bit so I can see inside just a little bit.

So where can you find this clock kit I’ve been ranting and raving about? Right here.

//Matt

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Friday, November 4th, 2011 What's New?

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