Project: Da Bomb

[ouija]

This project is basically a "bomb" for use with an airsoft game. Below are the replies from everyone with suggestions, might be useful for anyone planning to make their own. I'll be posting more when I begin to build the actual bomb.

[ouija]

Yes, I plan to blow up some buildings

J/k - Zap's helping (when I say helping I mean he's ended up making the schematic for me) with a bomb for paintball/airsoft. After 30 minutes it'll let off a smoke bomb or whatever, and can be defused by cutting a wire.

[ouija]

Would be 1800 seconds... original design was a digital display, I thought a blinking LED or beeping noise would be easier... which sped up nearing the end of the "countdown" before detonation. I dunno though, a digital clock style output counting down from 30mins and 0secs would be really useful.

As for the detonation/disarming mechanism, that's been sorted out and it doesn't really matter what the rest of the circuit is set up like as it won't affect this.

[ouija]

That would be perfect. The team setting the bomb would need the ability to reset the counter and start the countdown seperately. The team disarming, would open a panel and cut a wire. One wire would disarm the bomb (disconnect power), and the other wire(s) would detonate (vcc short through transistor to relay).

[ouija]

Lol How touching

[ouija]

Originally posted by whypick1
Hate to jump in and not contribute to the circuit, but if this is to be used for paintball, wouldn't it be a good idea to ditch any visual cue as to when it's going to blow up? If the enemy team finds it, I'd think that you'd rather have them stand around for a couple minutes wondering what the hell it is and get "blown up" rather than have them run like hell and warn the others where your bomb is.

Oh, and just for kicks, have two wires, one disarms and one instantly sets off the bomb. Have one be red, and the other blue. Watch as hilarity ensues and every Hollywood bomb-disarming cliché comes to life.

Firstly, it's not paintball

Secondly, the bomb will be the main goal of the game... so there can't be players who don't know about it.

Also, I already mentioned extra wire(s) that detonates the bomb.

Originally posted by ouija
One wire would disarm the bomb (disconnect power), and the other wire(s) would detonate (vcc short through transistor to relay).

[ouija]

Yes, just one question... does it work?

Actually, how much will that cost to buy the components? Also, the digital display, it'll be more than one digit right?

[edit] Oh yea... I hope you haven't made it overly complicated just to show off It really needs to be cheap and easy to build.

ALSO!! Cutting one of the detonation wires won't detonate the bomb.... as Zap and I were discussing earlier, the detonation wires should be in series, not parallel.

[ouija]

If it costs over £15 to buy the components it's really a waste of time and needs to be much simpler

[edit] Looks like livewire, can you post the circuit?

[ouija]

[ouija]

Demonstration version

[ouija]

Emmm ok

[ouija]

Hey if you can come up with the schematic, I will build it and post pics and if possible... a video of it working

[ouija]

Oh yea.. good idea.. some are instant then

Oh ZAAAP!

[ouija]

I can't find 4029B's on RS electronics. Is this the same deal?
4029 4b Sync Up/Down Binary/Decade Counter with Preset and Carry O/P

[edit] Actually, there are 4029BT's and 4029BP's

[ouija]

"many other things"

The relay could be wired up to almost anything, even real explosives... which is pretty scary when you think about it.

[ouija]

Damn Zap, that's perfect!!!

[ouija]

To keep the trigger wires togther, your loop and not gate should be removed... look at Zap's schematics.. as many instant detonation wires as needed can be added next to the "speed-up-timer" wires

[ouija]

Zap, I was thinking of gettong some spring loaded terminals. Would also be useful for wiring up anything to the relay, simply two terminals exposed which you can connect to anything you want.

I still think the second option would be better, to keep the wire order randomised. Unless the terminals were hidden away and could only be reconnected to rearm the bomb by opening the cover (screwed on)

[ouija]

Someone hasn't read the entire thread...

[ouija]

Originally posted by Reverend Scapegoat
The teams then have to notice the "laptop" that's hanging from a parachute in a nearby tree, and see the wiring diagram on it's "screen".

That would completely remove the probability of accidental detonation... which would make it pretty boring defusing the bomb.

1) find bomb
2) find laptop
3) copy laptop diagram
4) yawn game over

OR

1) find bomb
2) check around in the "matrix" panel for clues of which wire to cut
3) cut a wrong one and the timer speed increases.. oh dear
4) cut too many or even a trigger wire and boom. game over

An angled mirror like dentists use can be bought for a few £ and would be excellent for peering behind the matrix of wires to try and trace where the wires go... the diagram could be of the INSIDE layout and the obviously visible wires are mixed up slightly. This would make it necessary to check behind whatever the wires are fed through and try to figure out which is the correct one.

Hard to explain, but if that doesn't make any sense I'm working on a 3D sketch of my initial design and the aluminium box that was shipped today will make it a lot easier to visualise.