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Thread: Startup pulse fix with Jeff Shutdown Controller

  1. #1
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    moahdib's Avatar
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    Talking Startup pulse fix with Jeff Shutdown Controller

    I found a nice and relatively easy fix for those who are using laptops or atx mobos with no auto turn on feature in bios.

    Just add a relay, a cap and resistor. See image below.
    You get a nice 2 second pulse on the ATX wire ( connects to ground) when you first turn on the car. Then the shutdown controller takes care of everything when you turn off the car. Basically you are getting a pulse whenever the switched 12V line goes from off to on.

    This is an old drawing I made of the controller years ago and I just edited a bit.
    Hope helps those of you with that problem.

    If you are looking to build the whole controller go to www.carpc.tk for a detailed description of all the parts.
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    04 Acura TL w/ core2duo 2ghz laptop w/ 1gb RAM on a docking station.

    Fast car, fast PC. ;)

    http://www.arcdesigns.net/carpc/

    My TL CarPC ver2

    FSR Flash Skin w/ moving weather maps

  2. #2
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    jeff's shutdown controller can be modified to add auto turn on by adding a single capacitor to the board - ask him about it...
    all that effort may have been in vain
    www.digital-car.co.uk - The UK CarPC Forum

  3. #3
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    No, I have talked to him. If you add a single capacitor and resistor, when you manually turn off the computer, then turning off your car will restart it again. This doesn't happen in my drawing. You only get a pulse when turning ON. The simple relay, cap and resistor can be used for other applications like auto turning on the lilliput etc... If you use a pot you can also vary the timing of the pulse.
    Well thi

    This certainly beats using somethign like a DEI 528T pulse timer relay. =)

    I have some pics of my modified mastero shutdown controller.
    Sorry for the quality, im using my palm camera.
    Attached Images Attached Images   
    04 Acura TL w/ core2duo 2ghz laptop w/ 1gb RAM on a docking station.

    Fast car, fast PC. ;)

    http://www.arcdesigns.net/carpc/

    My TL CarPC ver2

    FSR Flash Skin w/ moving weather maps

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