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Thread: Need help, please point me in the right direction (auto turn on pc) ...

  1. #1
    Variable Bitrate
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    Need help, please point me in the right direction (auto turn on pc) ...

    Long story short: I'm using a laptop motherboard. I'm powering it through the AC adapter that came with it, through an inverter connected to the accessory power line.

    This allows the computer to receiver power when the ignition is on ... but I can't figure out how to make the computer automatically turn on.

    this board has the standard pin headers for the power switch as you would see on a regular motherboard. I assumed I would be able to short the pins out ... but this works to an extent... when the board gets power, it turn on, but then turns back off 4 seconds later...

    What do I need? momentary switch? I see the EZ CarPC shutdown controller ... or an ITPS, etc. But I don't know how these interface with the computer ot make them turn on/off.

    Please educate me ! I don't know how this stuff works! I got everything else figured out except this one thing. The only thing *I* would know how to do is put some kind of push switch in my dash ... I'd have to manually power it on everytime i get in my car I don't want to do this...
    Thanks! -Matt

  2. #2
    Maximum Bitrate zPilott's Avatar
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    shorting the pins is the same as HOLDING the button down, which will just tunr the computer off after a couple seconds. You are right, you need a monentary switch. If you look around you can find some ideas people have had using relays that might be able to help you.

    Another guy wired his to his factory alarm unlock pulse (which would be my preference, but I have never gotten around to seeing if it is doable).

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  3. #3
    Variable Bitrate
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    unfortunatly, I don't have a car alarm or anything, so that wouldn't help me...

    I did a search for "Momentary Switch" on the forums, and read my eyes out, but couldn't find any info on it... Do I have to build it? Can i buy it?

    I'm assuming it's like a relay that gives only a short instance of "on"

    Can you help me in my quest?
    Thanks for your reply!

  4. #4
    Constant Bitrate John_Duh's Avatar
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    Quote Originally Posted by zPilott
    Another guy wired his to his factory alarm unlock pulse (which would be my preference, but I have never gotten around to seeing if it is doable).
    What guy would that be, can you point me in his direction, since i would be greatly interested in this sollution. This would allow the pc to boot while i'm still walking the last couple of meters to the car.

    nevermind .... found it
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  5. #5
    Maximum Bitrate Vchat20's Avatar
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    this may be of some help. i remember discussing this circuit a while back during my flight sim fascination. basically it was made for homebrew flight sim cockpits where a switch of some sort needed wired to a keyboard. essentially what this ciruit does is instead of having a continual button press that you get by wiring the switch directly to the button, this ciruict placed in the middle would momentarily press the button whether the switch was on or off.

    this circuit is essentially what you would be looking for.
    Your everyday carpc geek and tech guru at your service. *bow*

  6. #6
    Variable Bitrate
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    Our CarPC EZ or Pro power controllers will work. If you want to know how they interface, then look at the installation manual. It will connect to the header you found to turn on and off the PC, and can connect to few other items. The version on our website has an option to disable the PC Monitor (which needs to be done if you can't attach to a +5v line in the laptop).

    I am sure you will be much happier this way than any other. Why? If you use it to control the inverter as well (as described in the Installation Manual), then you won't ever have to worry about the PC. Jump in the car and start it, the PC will startup itself. Jump out and turn off the key, it turns off completely and properly by itself. Run the PC with the car off, it automatically shuts down if the battery gets too low (user adjustable levels and timers). Plus much much more.

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  7. #7
    Stank Cheese n8scstm's Avatar
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    BUy a momentary relay. Search for that, not momentart switch. DEI makes a lot of stuff like that. Im sure you can find something on there site.
    Or google.
    http://www.google.com/search?hl=en&l...ry+pulse+relay
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  8. #8
    Registered User Nicorolla's Avatar
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    I think your best solution in this case would be KyferEz's power controller circuit. When it comes to carPCs, there is no greater convenience than having ur PC power up and shutdown on it's own.

  9. #9
    Maximum Bitrate zPilott's Avatar
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    Quote Originally Posted by KyferEz
    Our CarPC EZ or Pro power controllers will work. If you want to know how they interface, then look at the installation manual. It will connect to the header you found to turn on and off the PC, and can connect to few other items. The version on our website has an option to disable the PC Monitor (which needs to be done if you can't attach to a +5v line in the laptop).

    I am sure you will be much happier this way than any other. Why? If you use it to control the inverter as well (as described in the Installation Manual), then you won't ever have to worry about the PC. Jump in the car and start it, the PC will startup itself. Jump out and turn off the key, it turns off completely and properly by itself. Run the PC with the car off, it automatically shuts down if the battery gets too low (user adjustable levels and timers). Plus much much more.

    KyferEz


    I checked out the website, and I am still a bit confused how it would work with my laptop. Currently I have the laptop attached to an inverter (I had a DC-DC power supply, but I blew it, I would like to go back to that in the future). The inverter I have has a manual switch, afiak, there is no way to wire the switch without taking it apart. Everything is connected to ACC power. I use a manual switch to turn on the computer, and software to turn it off when it goes to battery.

    What I would like:
    • Constant power line, with low voltage protection (I want to have my gps recharger plugged in all the time, but I want it to disconnect from the battery before the voltage drops too low to start the car.
    • When the switched power comes on, I want something to "push" the power button (short the wires that I have coming out) if the computer is not already on (I can supply a +5V when the computer is on).
    • When the switched power is off, I don't want it to do anything, except cut the constant power, if the voltage gets too low


    So, can you help me out?

    |V1 Virtual Display|

    Hard work often pays off over time, laziness always pays off right now.

  10. #10
    Variable Bitrate
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    The inverter I have has a manual switch, afiak, there is no way to wire the switch without taking it apart.
    For our power controller to control power to and from the inverter, you either open the inverter and hook up the green wires in parallel with the switch on the inverter (as shown in the Installation Manual), or you use an external high current relay to disconnect main power from the relay, which the Power Controller can control, as shown in the Power Relay Install in the Accessory Manual.
    • Constant power line, with low voltage protection (I want to have my gps recharger plugged in all the time, but I want it to disconnect from the battery before the voltage drops too low to start the car.
    That can be done. If the power controller is set in Remain-on mode (as shown in the Accessory Manual, then the hardware is only turned off if voltages get low. The amplifier control line or the screen control relay could be used here (they could still also control the amps and screen).
    • When the switched power comes on, I want something to "push" the power button (short the wires that I have coming out) if the computer is not already on (I can supply a +5V when the computer is on).
    That is exactly what will happen. Note that if Remain-on mode is not used, the Power Controller does not allow the PC to turn on when the car is off to try and prevent glitches in certain types of PC/PSU setups.
    • When the switched power is off, I don't want it to do anything, except cut the constant power, if the voltage gets too low
    That is exactly what Remain-on mode is. It keeps everything on for as long as your battery will operate it, then shutdown everything properly when voltages get low. It will then turn it all back on once voltages become an acceptable level again, such as you start the car. The voltage levels are adjustable by you.

    Don't hesitate with more questions,
    KyferEz
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