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Thread: Making my own shutoff switch

  1. #1
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    Making my own shutoff switch

    Alright, I'm in the midst of putting together my car-puter and love the idea of having the PC boot and shutdown on its own alongside the ignition. Thing is, I don't feel like spending $200 on a PSU with that function. I've got the computer ready, with a standard ATX PSU, and then a 400W power inverter (easier for me since I need the extra sockets, and cheaper than getting a DC-to-DC PSU). Now, the inverter has a safety shutoff at 10.5V, but how would I go about making a relay switch to get the PC to shut down when the car turns off, and to turn on again when I start the engine? Thanks guys.

  2. #2
    Well, He asked for it. WebDog's Avatar
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    well how many watts do you need? the M1-ATX is a start up / shutdown and PSU for like $70
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  3. #3
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    I'll be needing about 200W - the PC will be a P3 1Ghz, 256mb ram, 10Gb hard drive (will be running most stuff off of external usb drive, with usb ports routed to front of car), dvd-rom, wireless nic, wireless mouse/kb, 7" LCD... thats about it.

    That M1-ATX seems to be 90W, and no matter how good they are I'm still not convinced it'll give me enough juice.

  4. #4
    Low Bitrate code-'s Avatar
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    Yes they will...
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  5. #5
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    Quote Originally Posted by code-
    Yes they will...
    Dude, I know they're supposed to be good and all, but seriously - running that from a 90W PSU? I mean if it was a VIA EPIA mobo and cpu I'd agree, but its not. Just the processor and RAM will suck up two-thirds of that wattage.

    Any reviews on the PSUs running anything more power-hungry? That would convince me a little more.

  6. #6
    Well, He asked for it. WebDog's Avatar
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    Quote Originally Posted by error_911
    I'll be needing about 200W - the PC will be a P3 1Ghz, 256mb ram, 10Gb hard drive (will be running most stuff off of external usb drive, with usb ports routed to front of car), dvd-rom, wireless nic, wireless mouse/kb, 7" LCD... thats about it.

    That M1-ATX seems to be 90W, and no matter how good they are I'm still not convinced it'll give me enough juice.
    well im runing the M1-ATX with a M10000, 256mb ram, 60gb 2.5" hdd, 7" lcd, then i got on USB, Cell phone charger, GPS, WIFI, Keyboard, CD-ROM, AUDIO out, Bluetooth, toch screen. all going at once and i havent had a problmem with it.

    How much juce the p3 suck up?
    1990 Jeep Cherokee
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  7. #7

  8. #8
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    WebDog: a 1Ghz P3 sucks up about 35-40W of juice. But you might be right, and i'm going to start looking around for some reviews.

    SFiorito: that shutdown controller is $60, I might as well buy an Opus.

    ... which reminds me - where the hell do I buy an Opus ?

  9. #9
    MySQL Error Scouse Monkey's Avatar
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    Quote Originally Posted by error_911
    ... which reminds me - where the hell do I buy an Opus ?
    Are you bloody joking?

    go to www.mp3car.com and look on the front page!

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