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Thread: Yet anothher advanced carputer controller idea

  1. #1
    Newbie bokhoven's Avatar
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    Lightbulb Yet anothher advanced carputer controller idea

    I would like to make a start and shutdown controller that does the following?
    (see attachment)

    Does anyone have an idea how to accomplish this?
    I have seen many schematic's of shutdown controllers.
    None of them had all the functions listed in the attachment.
    Attached Images Attached Images  

  2. #2
    Raw Wave
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    Whats the standby line for? you want the computer to go on standby when you turn off the ignition?

    You can setup your PC so that it goes on standby when you press the ON/OFF button.

    If you wanna build one, the easiest way is to use a PIC microcontroller. I have attempted to make a shutdown with logic gates/delays but it get too complicated for what it can do.

  3. #3
    Newbie bokhoven's Avatar
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    Yes i want the computer to go in standby when the ignition is off,

    I know that it's possible to put the computer in stanby when i press the on/off switch.
    But then i can't shutdown the computer probaply.

    I made a attempt also, i have no experience with pic's an suchs

  4. #4
    Constant Bitrate
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    This link has details of a PIC-based project that does almost exactly what you want except for the standby output. It would be quite easy to modify to add in the standby pulse on a spare output pin.

    Where exactly will you be connecting the standby output to ? Most PCs can only be controlled using the power on switch, which I am controlling using the Power Switch output of my shutdown controller.

  5. #5
    Raw Wave
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    Ok I think I get it now,

    You want your PC to go on standby first for sometime before shutting down completely?


    shchua,

    Im sure he can put the PC on standby by using a fake UPS on serial port if theres no available standby button. It just mean he need to send a signal to the serial port, in that case it doesnt have to be a pulsed signal, it just a steady 12V/0V which can be derived from the "switched +12v"

  6. #6
    Newbie bokhoven's Avatar
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    yeah, you got it right,
    hmm thnx for the link, but's there a way to do this with logic components?
    I'm not into pic's, I dont have a programmer and such,
    Is a pic almost the same as a PLC?? (A PLC is to expensive anyway)

  7. #7
    Raw Wave
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    Sure you can make it with logic and delays circuitry. Its easy to derive the outputs...implementing the delays get a little too messy.

    The PIC is a microcontroller running at 4-20Mhz so you can do all sort of things with it. A PIC 12C508 can easily do all you asked for...it only cost about 1.50. Even if you have to make a programmer its still cheaper to make it rather than from logic gates. For more or less the same price you can use the reflashable PIC 12F629 with built in comparator, can be used for low battery detections. Just reflash it if you are not happy with the way it operates

    Learning to program a PIC is probably one of the most valuable knowledge to have when it comes to digital electronics.

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