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Thread: How to build a very simple delayed power oft circuit?

  1. #21
    What can I say? I like serial. Curiosity's Avatar
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    Well, there are 3 different options (Power fail, Low battery, UPS Shutdown). It looks like each one is a different pin or something. What's the difference it what they do? Maybe one is for a delayed shutdown?

  2. #22
    What can I say? I like serial. Curiosity's Avatar
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    I found some good info here. All kinds of pins are used for different things.

  3. #23
    FLAC
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    Thanks. Looks like I can get this to work with just a resistor and a relay by using the existing +5V pin on the serial port. If I'm reading it correctly that means I don't need to extend the PC +5V outside of the case.

    The stuff I read said to use pin 8 which is low battery according to your link. I'd configured my pc to use "on battery" so maybe that's why I saw no delay. I'll try using low battery instead.
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  4. #24
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    The source code package for the Linux "powerd" project has some info on building a simple shutdown system through the serial port with a 10K resistor and relay. I'd be tempted to throw a few bucks at a serial port surge suppressor too, unless someone knows what kind of MOV to run in series.

    There's also this multi-functional module from PAC Audio that has many possible applications as a carputer controller, including delayed shutdown:

    http://www.pac-audio.com/products/alarm.htm

    Scroll down to the bottom and look for the "TR-7." A while back I sketched out a controller / tank circuit based around a few of those, but after doing the math I realized it would be just as expensive as the Carnetix ...

  5. #25
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    My bad -- the instructions are actually in an older version of the Linux UPS-HOWTO file. It's the old version by Harvey Stein, not the new one by Eric S. Raymond.

    Here's a link to the old version.

    http://www.linux-es.org/docs/HOWTO/UPS-HOWTO

  6. #26
    MySQL Error MatrixPC's Avatar
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    This is one of our own old time member here.
    http://www.astron.nl/~smirnov/poweroff.html

    The circuit provide 5~10 min of power after you take the key out.
    It is usefull if you do a 5v-pin 8 serial with Generic shutdown solution.
    I am going to build this circuit and test it out.
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  7. #27
    FLAC
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    Since I had my first hang when telling the computer to hibernate (and note this is just with XP running, next to no other software installed - and nothing actually running...), I'm suddenly a lot more inclined to build a circuit like the one in the link - particularly since it looks almost as simple and relatively cheap.

    I'm still intending to use the fake ups trick if I can solve it so that I can get a 30sec delay on it (need the drop in the acc line during crank to not trigger the PC to hibernate!).
    Progress: 80% - Permanent install left.
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  8. #28
    FLAC
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    Quote Originally Posted by MatrixPC
    This is one of our own old time member here.
    http://www.astron.nl/~smirnov/poweroff.html

    The circuit provide 5~10 min of power after you take the key out.
    It is usefull if you do a 5v-pin 8 serial with Generic shutdown solution.
    I am going to build this circuit and test it out.
    Let us know how it goes.

    I just realized I may already largely have the ability to cut power like this. The regulators I'm using have a 4th pin to control on or off. I may just be able to hook that up with a suitable capacitor and resistor and be done. That would be a pleasant bonus...

    I wonder if there's any way to trigger a momentary like this? I.e. Constant -> off after 30s -> momentary.
    Progress: 80% - Permanent install left.
    Motion LS800 Tablet PC and dock.
    Vista, Bu-535 GPS, RoadRunner, MPT2006.

  9. #29
    What can I say? I like serial. Curiosity's Avatar
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    Quote Originally Posted by Arathranar
    I wonder if there's any way to trigger a momentary like this? I.e. Constant -> off after 30s -> momentary.
    the12volt.com has a pulsed to momentary, and if there were no relay involved it would last a really long time. You'd just have to figure out how much that pin4 draws and do some cunfusing EE math.

  10. #30
    FLAC
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    Quote Originally Posted by Curiosity
    the12volt.com has a pulsed to momentary, and if there were no relay involved it would last a really long time. You'd just have to figure out how much that pin4 draws and do some cunfusing EE math.
    Actually I was more thinking of avoiding the fake UPS and toggling the power switch directly 30s after the acc line goes low. That leaves my COM port free for other things (although I'm not sure what!).

    I think I just worked out how to do a constant -> off -> momentary using a relay.
    Progress: 80% - Permanent install left.
    Motion LS800 Tablet PC and dock.
    Vista, Bu-535 GPS, RoadRunner, MPT2006.

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