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Thread: Ghetto Startup/Shutdown Control for Inverter

  1. #11
    Raw Wave Laidback's Avatar
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    Quote Originally Posted by vcbb5
    Laidback- I still don't understand how 5v from the psu would shut the computer off when you switch off the ignition. You would have to go from an acc line or ignition line to tell the computer to shutdown (assuming your using the fake UPS idea, which i substituted with the com 4, com 8 short idea in my latest plan).


    I'm not sure how I can explain it any simpler!

    UPS service needs 5v on pin 8
    Take 5v away from pin 8 and computer shuts down. Simple!

    Once again, it doesn't matter where the 5v comes from, PSU, a battery on the passenger seat or a wind generator on the roof!!
    Maybe you forgot, I use a relay controlled by the IGN wire.
    IGN on = 5v to pin 8 = computer stays on
    IGN off = 0v to pin 8 = computer shuts down

  2. #12
    Raw Wave Laidback's Avatar
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    Doh! OK, I just realised what you may be missing!!!

    In WinXP you need to configure a 'generic UPS' - Control Panel > Power Options.

    This is a service that runs in the background and you configure it to have 'positive signal polarity' This means it looks for 5v on pin 8. When 5v isn't there the service closes windows down. This is how UPS's usually work.

    That might explain things better hopefully...

    If you don't have WinXP, you will need the little program, you linked to above, which works in the same fashion.

    P.S. (and I hope not to add to the confusion here)
    You could also configure it to 'negative signal polarity', Then it would look for 0v on pin 8 and if it got 5v on the pin *then* it would shut down. (Maybe this way could be used with an alarm system, I don't know)

  3. #13
    Variable Bitrate vcbb5's Avatar
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    ah, didn't know about the relay
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  4. #14
    Variable Bitrate vcbb5's Avatar
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    It also works in windows 2k. I turned it on, on one of my home comps, and pretty soon it restarted just after starting the comp up . I than booted to safe mode and turned it off though.

    I think that using the cross pin 8 and 4 would be easier than running power to the line, and probably safer.
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  5. #15
    Constant Bitrate weekendowel's Avatar
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    You can configure my program to wait with the shutdown for an amount of time after you have shorted pin 4 - 8.
    Letīs say you set the time to 10 min and you turn off your car, then the pc would stay on, and then you turn your car on after 5 min then the pc will continue to stay on.

    I have some new things that I will throw in to it.

  6. #16
    Variable Bitrate vcbb5's Avatar
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    weekendowel- love the program
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  7. #17
    Confusion Master
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    Why is everyone messing with the 8 pin on the serial port. all you need to do is have the PC set to hibernate, standby or switch off when the power button is pressed. Then have a lead that goes to the power switch connector on the M/B going to a relay that will monetarily close the switch.

  8. #18
    Constant Bitrate weekendowel's Avatar
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    The problem is with the relay that should send a pulse to the motherboard, if you just turn on your ignition and then turn it off right away, then the PC will startup and stay on, when you start your car the PC will go to hibernate. With the comport idea it canīt go in the wrong phase.

  9. #19
    Maximum Bitrate starfox's Avatar
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    Nice simple idea, hope it all works out

  10. #20
    Raw Wave
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    Sorry for the delay the forum is always down and cant post until now.

    Diagram of external WOM trigger on COM port :
    http://english.aopen.com.tw/tech/techinside/wom.htm

    UPS - COM port pin definition :
    http://support.microsoft.com/default...kb;en-us;98885

    Wake test :
    http://www.microsoft.com/HWDEV/Onnow...d/waketest.htm

    COM port pin out :
    http://www.infonewsindia.com/pinout/#5


    Not sure what volatge you can apply on "ring indicator" but Ill assume it should follow the RS232 signalling spec. Theres plenty of info on net just it

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