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Thread: Delayed 12v shutdown device required

  1. #1
    Constant Bitrate
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    Delayed 12v shutdown device required

    Hi all

    My CarPC is a Dell FX160 Thin Client ATOM Based PC. It is powered by a simple P4 plug connector. Because of this, I was able to power it straight from the Car Battery (well almost, I added a DC-DC Regulator), switched vis the ignition.

    Is there a simple battery support which can give me about 5 minutes of 12v power after the ignition is turned off ? It's just for instances when I go into a petrol station and the like, without the PC being shut down and restarted from scratch again, when I cut the ignition.
    Last edited by championc; 12-12-2014 at 03:22 PM.

  2. #2
    Variable Bitrate
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    a simple time relay could help to hold the power.

  3. #3
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    You could add an extra toggle switch the keeps it on until you turn that toggle switch off. That's what I did with my truck. If you wanted on for even longer like washing the vehicle with music on you can


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  4. #4
    Variable Bitrate
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    if you wire it directly to the battery (or in some line that is always connected with the battery), then it will not loose power after ignition is off.
    then, as mentioned, you can add a timing relay to achieve what you want!

  5. #5
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    Quote Originally Posted by settra View Post
    if you wire it directly to the battery (or in some line that is always connected with the battery), then it will not loose power after ignition is off.
    then, as mentioned, you can add a timing relay to achieve what you want!
    Ah ha, gotcha, perfect - so a timer relay triggered by the ignition switch. I'll just need to run another pair of 12v + and - wires.

    I originally had it on the battery line but twice it hadn't shut down properly (or had restarted) and then drained the battery, which was why I went back to ignition switched instead.

    Many thanks

  6. #6
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    Of course, another useful addition now would be to add a shutdown trigger to use the ignition to trigger a signal to the com port of the PC to shut it down. What bits do I need to accomplish this ?

  7. #7
    Variable Bitrate
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    Quote Originally Posted by championc View Post
    Of course, another useful addition now would be to add a shutdown trigger to use the ignition to trigger a signal to the com port of the PC to shut it down. What bits do I need to accomplish this ?
    That depends on how good you are with electric circuits... I don't know if you can buy a timing relay from somewhere (you certainly cant, where i leave :P ). But you can make one :

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    this is the circuit, that i use, in order to keep the "power window Line" active, for 30seconds after the ignition has been turned off (so that i can close the windows if i forgot to do so :P )

    The relay will give power to the PC, after the IGN signal has arrived. after the IGN signal is lost, the inside capacitor, will act as "fake ign signal" for X seconds (until it has been discharged).
    • How many those X seconds will be, depends on how big the capacitor is (in farads), and how big the resistor is (in Ohms).
    • How big the resistor can be, will be determined , by the NPN transistor that you will use (how much current it needs in order to oparate).
    • Do not forget that diode, or else the transistor will get fried as soon as the relay de-energizes

  8. #8
    Variable Bitrate
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    lol, i just noticed that what i posted has nothing to do with what you asked :P i am sorry!
    anyway, DIY shutdown/startup controllers, are fairly described here : http://www.mp3car.com/the-faq-empori...ntrollers.html

    just make sure, to make it so, that the PC has still power,when it gets the signal to shutdown

  9. #9
    Variable Bitrate
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    i can remember you drive a BMW and use RR with IBus Plugin.
    I would add a IBus Command when you close your car or turn ignition off, RR switch to a shutdown screen with idle timer.
    after the time -> the pc shuts and your time relay cuts the powerline.

  10. #10
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    Quote Originally Posted by harryberlin View Post
    i can remember you drive a BMW and use RR with IBus Plugin.
    I would add a IBus Command when you close your car or turn ignition off, RR switch to a shutdown screen with idle timer.
    after the time -> the pc shuts and your time relay cuts the powerline.
    Actually my last posting was stupid because the one thing I don't want is for the PC automatically shutting down. I only want to shut it down if I decide that that is what I want to do. As I said in the beginning, we all have the instances where you jump out of the car for two minutes, for a shop or petrol, or maybe even stall the engine. The last thing you want to do is to shut the whole thing down.

    I found a relay which I think will do everything I want
    http://www.ebay.ie/itm/271203168131?...84.m1423.l2649

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