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Thread: Question regarding auto-on & auto-off gizmos

  1. #1
    Variable Bitrate
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    Post Question regarding auto-on & auto-off gizmos

    Ha sany body had any problems with their auto-shutdown controllers triggering their alarm systems? I know that some alarms will trigger when there is a change in car voltage/current when they are armed.

    I'm concerned about this possible scenario: I walk away from my car (PC is on), the alarm automatically arms a few seconds later, then when teh auto-shutdown controller turns off the PC, the alarm might go off.

    Any danger of this happening? Any guesses?

    TIA
    ~m
    PII 266, 512 MB RAM, 10 Gig, 36x CD-ROM, 16x DVD, DeLorme GPS, 5.6" LCD Screen, Dschmidt power controller, Keypower ATX DC-DC Supply, PowerAmp Macro controller, Dauphin mini-Kbd.
    Sony Head Unit, Sony Unilink input selector, rear deck Kenwood 6x9's, stock door spkrs... All in my '96 Civic, of course :}
    BC ROCKS!!!

  2. #2
    Maximum Bitrate
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    Post

    I'm no car expert, but i think that this is the way that cheaper alarms detect your car being tamperd with. Mine uses the interior light switch on each door. Although it does trigger if u disconnect the battery. Try it and see
    http://www.mp3vl.tk Plans and progress on my install - (Updated 28 June 02)
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    mp3car related links Check them out / Add some
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  3. #3
    Variable Bitrate
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    Post

    First off, Thanks, hornet.
    It's an expensive alarm (Remote starter, a gazillion interface options, etc.) - I just don't want to fork over the cash for a (auto-power) module that might not work...

    Any other opinions?

    ~m
    PII 266, 512 MB RAM, 10 Gig, 36x CD-ROM, 16x DVD, DeLorme GPS, 5.6" LCD Screen, Dschmidt power controller, Keypower ATX DC-DC Supply, PowerAmp Macro controller, Dauphin mini-Kbd.
    Sony Head Unit, Sony Unilink input selector, rear deck Kenwood 6x9's, stock door spkrs... All in my '96 Civic, of course :}
    BC ROCKS!!!

  4. #4
    Low Bitrate
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    Post

    Most alarms work on a voltage drop - not a voltage rise.
    If I arm my alarm with me sat inside (very still so I don't disturb the ultrasonics!) and the interior light on, and then turn it off, nothing happens. If I turn it back on again the alarm goes off.
    So if your pc turns itself off the voltage will rise and nothing should happen.
    Some alarms (The Moss range of alarms in the UK) have a wire that you run to the electric fan next to the radiator so that if it comes on after you've armed the car and walked away - the alarm knows the voltage drop is the fan automatically coming on and doesn't trigger. You could use this method a) if it does trigger when the voltage goes up and b) if you have this wire (blue on Moss alarms)!

    A question though, why don't you just make sure the PC is shut off before you leave the car?
    Best regards,

    Darren Thrower
    http://www.percyt.com/mp3player.htm

  5. #5
    Maximum Bitrate gizmomkr's Avatar
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    Post

    I would look for the radiator fan wire, but note color codes are meaningless.

    No offence to percyt2k, but color means nothing. thats like the sterotypical bombsquad guy " cut the green wire"

    If your building the bomb, you could just as well made every wire blue.

    As for the car alarm, I have installed alarms from about 8 different manufacturers,
    Audiovox, Bulldog, Crime Gaurd, Magnadyne, Viper.... just to name some.

    Each alarm has different color codings, check your alarm manual, or risk frying your new (and sounds like its expensive) alarm.
    Gizmo-
    Techonlogy on Wheels
    http://www.hjnetworks.com/car

  6. #6
    Newbie
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    Sep 1999
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    Sun City, CA, US
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    Post

    I have a DEI Viper alarm on my car, and I have the same setup as you, I arm my alarm, and then a few seconds later the computer shuts off. It has never caused a problem, so I would tend to agree that it's a voltage decrease that triggers it.

  7. #7
    Constant Bitrate
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    Post

    I was a Caraudio installer and you shouldn't have any problems with that setup. Usually the inexpensive alarms monitor the voltage its how it senses the dome light comming on. If you hae a DEI, Clifford, Alpine, Crimestopper, or similar then you will have no problem. I have a Clifford and I have my alarm control my computer without any trouble at all. Hope this helps. BTW Clifford is made by DEI now.
    Steve

  8. #8
    Variable Bitrate
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    You like me! You really, really like me !!!
    (Ok - Now that I've dated myself...)
    Seriously - Thanks, guys! I appreciate all the feedback. Based on all that info, I'm purchasing the Keypower ATX DC/DC power supply & DSchmidt shutdown controller from jkotecki.
    Again, my sincere thanks
    ~m
    PII 266, 512 MB RAM, 10 Gig, 36x CD-ROM, 16x DVD, DeLorme GPS, 5.6" LCD Screen, Dschmidt power controller, Keypower ATX DC-DC Supply, PowerAmp Macro controller, Dauphin mini-Kbd.
    Sony Head Unit, Sony Unilink input selector, rear deck Kenwood 6x9's, stock door spkrs... All in my '96 Civic, of course :}
    BC ROCKS!!!

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