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Thread: Momemtary switch to cut all power to comp

  1. #1
    FLAC PatO's Avatar
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    Momemtary switch to cut all power to comp

    I'd like to use something like this: Ghetto Startup/Shutdown Control for Inverter to allow me to cut all power to the computer after I put it into hibernate. The problem is that this circuit requires a constant power feed to tell if it should leave the computer on. I want to be able to trigger this ciruit using a momentary switch (AUX line out on a remote starter).

    I currently have the AUX triggering the POW-ON header on the motherboard - which powers up/down the computer just fine. I want to modify this so that all power to the computer is cut when I turn it off.

    Any ideas? I've killed my battery 3 times now - time to take out a little insurance policy!
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  2. #2
    Variable Bitrate rubicon's Avatar
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    Use a 12v relay that closes when you start up & stays closed until you close another circuit (i.e., the momentary pushbutton you're talking about). The circuit itself shouldn't be too difficult.

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    FLAC PatO's Avatar
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    Quote Originally Posted by rubicon
    Use a 12v relay that closes when you start up & stays closed until you close another circuit (i.e., the momentary pushbutton you're talking about). The circuit itself shouldn't be too difficult.
    They make something like that? A relay that sticks on or off when power is applied momentarilly?
    Note: The remote starter has to power the computer on *and* off...
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  4. #4
    Variable Bitrate rubicon's Avatar
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    Quote Originally Posted by PatO
    They make something like that? A relay that sticks on or off when power is applied momentarilly?
    No, you'd have to create a circuit around it. Something similar to this.

  5. #5
    vr4
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    It may be an EXPENSIVE solution, but have you considered a vehicle immobilizer? When you switch off the engine these throw some sort of relay switch which cuts all power to the ignition until you 'park' the keychain fob transmitter next to the immobilizer to turn the power back on again. IF you wired the shut down/start up controller into the power source at the correct point i.e. the ignition circuit you would lose ALL power to the computer within minutes of shutting down the car and it wouldn't come back on again until you started the car. You'd be adding security to your motor at the same time.

  6. #6
    FLAC SnyperBob's Avatar
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    Have you looked into different carputer starter circuits available? Check out www.dashwerks.com. Their circuit comes with a 30/40 amp relay which may take care of what you are trying to do. Their circuit is very easy to install.

  7. #7
    FLAC PatO's Avatar
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    Thanks rubicon! That's what I'm looking for. It's making my head hurt right now, but I'll eventually grasp what it's doing...

    vr4 - I don't want the computer to turn on when the key's in the ignition - I want to control it seperately from a remote. This allows me to, for instance, update the software via a wireless link from the comfort of my warm house without going outside.

    SnyperBob - I didn't see anything in the instructions relating to a momentary turn on circuit. All I saw was an ACC wire input... Same thing with the CarPC controllers. Could you... ha ha... throw me a bone?
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  8. #8
    Constant Bitrate
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    You can get relays that latch on or off based on a momentary switch contact. I have some gear that I wanted to be able to control independent of the ignition switch. A simple toggle switch would have done the job, but I wanted to use light gauge wire and a small switch for control. I'm not sure I actually accomplised a lot, but I thought I'd eliminate a little drain on the battery by using a latching relay that doesn't draw current when "on". I got an Aromat ADQ23Q012 relay from Digi-Key. This requires separate momentary switch closures for on and off. I think you can get ones that toggle based on a single switch closure as well if I remember right.

  9. #9
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    Quote Originally Posted by Alanh
    You can get relays that latch on or off based on a momentary switch contact. I have some gear that I wanted to be able to control independent of the ignition switch. A simple toggle switch would have done the job, but I wanted to use light gauge wire and a small switch for control. I'm not sure I actually accomplised a lot, but I thought I'd eliminate a little drain on the battery by using a latching relay that doesn't draw current when "on". I got an Aromat ADQ23Q012 relay from Digi-Key. This requires separate momentary switch closures for on and off. I think you can get ones that toggle based on a single switch closure as well if I remember right.
    Ahh, that's exactly what I'm looking for!
    "Latching relay". Thanks for the tip!
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  10. #10
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    Yes, a latching relay is deffinatly the best way to go.
    I 'cheated' and used a 4throw double pole 5 v relay. I had the momentary switch on one part of the relay, to close the loop to some batterys to 'jump' the relay. the relay catches, gives 120 to the pc, bios is set to on after power resume, gets its power off of the now powered compy, recharges the batts, and makes the switch go to the motherboard's power switch header.
    I could have done something much more elegant, but it was all I had laying around the house.
    I would do a diagram, but Alas, I am on the road.

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