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Thread: Powering PC With Power Button Instead of Automatic Power

  1. #21
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    If i hook my Opus directly to my crank battery bypassing ACC so it is receiving 12v all the time, can I use a momentary button switch to turn on the carPC when I want it on, and then press it again when I want to shut down, turning off the ignition, and let the PC finish its shutdown process after getting out of the car?
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  2. #22
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    I assume you mean momentary button connected to PWR+ and PWR- on the motherboard headers - yes, you could do that, but you'd still want to run ACC to your OPUS. That way, you just ignore the OPUS button pressing; when you turn on car, OPUS is on; when you turn off car, OPUS is off. Then, you can press the button to turn on computer, and turn off computer. If you forget to turn off computer, OPUS will kill power to it after OPUS shutdown delay.

    I think it's silly to make something completely manual when you can have an automatic solution.

    There's one other option. I use ITPS, but OPUS might be different - you could try tying the OPUS power switch wires and your own momentary switch. Depending on how the OPUS powers the computer, you may be able to use your momentary switch in addition to OPUS. THen if you forget to turn off computer before you leave car, OPUS will turn it off. Of course if computer is already off, OPUS will turn it on - because the OPUS doesn't know the current state of your computer.

    If i recall, your goal was to only turn on the computer when *you* wanted it on so other people don't have to deal with it... Perhaps you could solve it another way - like only turn on the screen for the computer when you want it on?
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  3. #23
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    Well, my dillemma is a bit different than the original poster. I just don't want my carPC to boot up everytime I take a 5 minute drive to the grocery store. The end result is the same, though - I want to be able to power up when I want to, and have the opus help me turn off the computer if I forget to shut down.

    So you say if I still hook the Opus up to ACC then that effectively will do what I want it to? Cool. If all else fails I'll just leave the screen on, like you suggested. But that fact that the computer is on when I don't want it to be will be lingering in the back of my mind... taunting me.

    Might just go with hooking up the Opus normally and forgo the switch. Depends on how fast I can get my boottimes.
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  4. #24
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    just do the hard toggle switch between ACC and opus. It'll only start to turn on when your car is on AND your swtich is on, but it will always turn off when the car is off.
    Damien Stolarz
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  5. #25
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    I did what you are wanting to do. I just simply put a rocker switch on the remote wire going to my opus. done deal. no remote signal, no power on.

  6. #26
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    Could you recommend a good looking power switch or button for the dash? I don't want something looking out of place on my dash if you know what I mean. Thanks.

  7. #27
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    Quote Originally Posted by legend5761
    Could you recommend a good looking power switch or button for the dash? I don't want something looking out of place on my dash if you know what I mean. Thanks.
    What car do you have.

    Look for switches already on your dash and get another one that does what you want, ie on/off or momentry. That's what I have done.

  8. #28
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    Carbot, are you sure that the Opus doesn't know if your computer is on or off? It should be watching the 5V signal from the mobo, which lets it know if the computer is running.

    Instead of what I said earlier, this is what I'd do if I wanted the Opus to only shut-down my PC (not start up):

    The Opus will try to turn on the PC when you start the car, but the relay intervenes. When you shut off your car, the relay now lets the Opus do it's normal shutdown thing. You start the PC manually with the button. You can also shut down the PC with the button, while the car is still on.

    The Green and Orange wires go to the soft power headers on the mobo (they are actually green and white on the Opus, but my background was white, so I made one orange).
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  9. #29
    Maximum Bitrate eCarô's Avatar
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    I forgot to point out a couple of reasons why I changed my mind.

    The Opus delays the start-up to give you time to crank your engine (which you don't need or probably want). My solution doesn't have that delay.

    The button now doubles as a shut-down button. The way I had it before, it would only start the PC. There is no delay when shutting down either (like you would have if you just added a switch on the ACC wire).

  10. #30
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    Ecar,

    I got a 2000 Chrysler 300M. Thanks!

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