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Thread: Anti-theft counter measures?

  1. #1
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    Anti-theft counter measures?

    I've recently been wondering how feasable it is to install offensive counter measures when your car is being broken into. Of course I don't want anything near lethal, but something that is more of a deterent then a blinking red light that seems to almost attract theives.

    The first idea I had a while ago would be to thread copper wires into the driver and passenger seats (or door handles) that are rigged to stun guns that would go off a couple seconds after ignition if a hidden disable switch was not used.
    Another idea would be to fill the car with a non-toxic gas, like CO2 (easy to get in the store with a straight face, but medical knockout gas would be cool if it wasn't regulated, oh yeah and deadly)that would force the occupants to get out of the car.
    My last idea was to have a super high pitched siren that was super annoying and "ear ringing" loud and ran from a separate battery and imbedded into the car so it wouldn't be easy to disable. So loud that driving or ripping out equipment would be impossible without serious hearing loss (maybe internal air horns). Would be pretty damn funny for someone to steal my car audio equiptment and go deaf in the process, almost like in third-world countries that cut of a thief's hand.
    Obviously I would want a super failsafe system on any of these devices, as a car accident due to the system activating while driving would NOT be funny

    Heck it would be fun to do all three. I guess my reasoning for this stuff is two fold. First, it would I would be pretty ****ed to see my $1000+ of painstakingly collected hardware get jacked by an ignoramus. Secondly, who does't want a James Bond car? Practically I was thinking of hooking it up to an alarm system if that is possible? I am in the market for an alarm so I wanted to brainstorm through this stuff first to see if an existing alarm system has usefull accesory connections.
    No one please start quoting off laws to me about the legality of it yet. I'll ask for forgiveness instead of permission

  2. #2
    Self proclaimed spoon feeder TruckinMP3's Avatar
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    if you are in the US you will get sued if the countermeasures are used.... It is BS but it will happen.
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  3. #3
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    Not to mention it would really suck if you got into an accident and triggered any of these counter-theft devices. I like some of your ideas, but don't know how feasible it'd be...as truckinmp3 said, you'd probably be sued.

    Checkout the link I posted about a week ago or so about software that emails you about its location whenever its hooked up to the internet for 20 bucks...

    I think the best defense (for now at least) is a good alarm system (maybe one that notifies you when its being messed with), a stealth install, and bolt *everything* down.

    I think if anyone has any ideas about car security, they should post them...I think everyone is concerned (at least a little) about their stuff being jacked.

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    Never thought I would say this, I'm moving to Canada! When we have a legal system that works this way I just lose faith in the people of this country.
    The US army has built the "Smart Truck " that uses many of these non- lethal counter measures. Yes, I understand I am talking about the army, but I would like to know which ideas are "technically" legal. Toxic gases and stun guns are probably out of the question, but what about air horns and ultra bright strobe lights everywhere inside the car? What is the legal limit on db for a siren? And would it be possible to get away with a stronger siren as it is mounted inside the car and would be muffled to the outside? Ofcourse I don't want to break glass with it
    Smart Truck uses tear gas, man would that be cool. How would that be illegal? And would a criminal really come to a judge and say "Sir, I was just doing my job, ripping this guy's car off, when all of a sudden I got sprayed in the face with mace and tear-gas. I demand justice!". Sound like something right out of Liar Liar.
    Thanks for the tips.

  5. #5
    Maximum Bitrate 00CericaRuss's Avatar
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    you can get inside self powered sirens for alarms... i think they're around 95-98db which is pretty damn loud if you're in the same cabin as them
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    Seems like a good idea...I mean even if they are only a little loud, if you hid them well (so that it would require taking apart half the front of the car to disable, for example) but made an open channel of space for the sound to get through (like a tube? just brainstorming, pardon my retardedness) and if it's connected to a similarly hidden independent battery, then at least they won't be able to disconnect it (easily) and hopefully it'll get them out of your car out unpleasantness....and at least they (probably) wouldn't take your car.

    Of course, the louder the better. heh.

  7. #7
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    What you are looking for is pain generators. They are the little extreme high output piezo transducers, the good ones put out 130+ db. You can't get in trouble because they don't damage someone, and you could imbed 10 of them all around your car on some failsafe system with individual power supplies (9v battery). They HURT too, extremely loud and the sound is untraceable so you can't find them to turn them off. Nobody will want to be in your car if they don't stop working even after the alarm has been severed. If someone was trying to steal your stereo they wouldn't be able to stand being in your car long enough to loosen a single screw. And when you research them and find some good ones post a link here, ok?

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  8. #8
    Maximum Bitrate MikeHunt79's Avatar
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    I had a quick dig for some of these piezo transducers, but had trouble finding anything over 120db (post if you do find something tho!). Anyway, considering that a jet engine produces 125db, then I'm sure these are quite loud.

    On www.cpc.co.uk, part number LS0108766 seems good. It's quite small, and produces 105dB @ 1m.
    Also, search for part number LS0108866. This thing is more like a siren, so it's bigger, but produces 110dB @ 1m, which is a fair bit louder.

    I`m no sure if these things need a signal to drive them, but even if they do, they are a pretty good counter measure IMO, especially if you stuff your car full of them.

    Also, one last thing, I wouldn't really care about the legal limit for siren loudness, since It's very hard to produce evidence that would stand up in court proving how loud you car is (unless you go waaaaaay overboard).

    EDIT found what seem to be the ideal thing: Look at part number SR0002466 (put it in the search box), it has both a 130db siren and a xenon strobe. It's a personal attack alarm, but could easily be adapted for the car.

  9. #9
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    The reason why you wont find sirens over 125db b/c that's the legal limit for consumer use. If you want louder than that you can place 2 125db sirens side by side and get 128db or 4 125db sirens together and get 131db. sirens produce tones around 1k-3k range which is the what humans most sensitive to. If you want anything louder than that on a single siren, you're looking at law enforcement sirens which is illegal to own.
    My idea of anti-thief counter measures is to have 2 wide angle hidden cameras placed on both A pillars with 2 looped time elapsed recorder, 1 for each camera. A radar motion detector to detect movement inside the car. Once the system detect movement inside the car, a warning comes on the speakers that tells the intruder to get out of the vehicle, the countermeasures will deploy in 2 minutes in English, Spanish, Chinese, Japanese, French, German, Italian, Russian, Korean Vietnamese, Laos. Give them 2 minutes to get out. If the radar detector still picks up movement inside the vehicle after the minutes are up, the system activates 4 strobe lights in side the car for 30 seconds, 2 on the dash facing the rear, 2 on the rear deck facing the hood. Then 4 125db sirens blasting inside the car for 30 seconds. Then after that, activate the CO2 smoke to fill up the cabin. If that still doesn't work well then you gotta give the guy credit for trying to steal your car. Everything will be caught on tape and will hold up in court. So none of that "your Honor, I was walking along the street and this car tripped me and I fall into the driver seat and the car attacked me" crap. Everything I've mentioned is doable with over the counter parts. You would need a **** load of relays, timers though. If I'm rich and have the time, I can build one.
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  10. #10
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    That is so incredibly complicated and cool. Post an .avi when you get it working

    And I was talking about those personal protection sirens, I knew I'd seen them at 130 dB. Like c-pro said, doubling the sirens doubles the output, and 3 dB gain is double the volume. I'll take 10 in my suburban, and hope it never goes off when I'm in it. You will want that on a time delay from your normal siren if possible. Give yourself 20 seconds in case you set it off and the battery in your remote is dead. My stereo might hit 150 everyday, but those sirens really mess up your hearing.

    Dave
    Old School MP3CAR.com member!

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