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  • Pc Freezing...When the power locks are used.

    Ok I thought this would be the best place to ask this question, since I am pretty sure it has something to do with wiring.

    Latley what started happening is when i use my power door locks my carpc freezes...??

    For example. I have an autostater on my car. I start my car and about 10 minutes later I go to get into the car so I press the unlock button on my remote. As soon as I press the unlock button, and the power door locks open the carpc freezes. I get into the car hit the restart button and it works just fine, then i go to lock my door and the pc freezes again.

    If I open the door locks manualy and open the door it works just fine. its only when i use the power locks... what could be causing this. would it be a short somewhere? I am pretty sure this started happening after I installed my powerd usb hub?? I ran power to it from the 5v on the extra HDD connectors??

    Any Ideas greatly appriciated. thanks!!

  • #2
    Ok little update,

    I just took everything apart to get to my car pc, and this is whats happening:

    With just power from the HDD to the USB hub, everything works just fine, so its not a short. BUT!! when i plug in the usb cable from the Hub to the mother board AND with the power, and tap on the power locks, it freezes.

    Does this mean I have bad drivers or a bad Connection or a bad USB hub??

    Thanks!

    Comment


    • #3
      that's a common issue when dealing with externally powered usb hubs. You're getting a voltage spike from the car's power, that in turn, locks up the computer.

      However, to overcome this issue it is best to use hubs that use two connections to your computer in the form of an USB "Y" cable- one for the usb signal, the other for the 5v input. But, you must also try not exceed your motherboards USB output amperage.

      It also sounds like you're powering the hub through the cars power window fused circuit.
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      • #4
        Originally posted by dMand View Post
        that's a common issue when dealing with externally powered usb hubs. You're getting a voltage spike from the car's power, that in turn, locks up the computer.

        However, to overcome this issue it is best to use hubs that use two connections to your computer in the form of an USB "Y" cable- one for the usb signal, the other for the 5v input. But, you must also try not exceed your motherboards USB output amperage.

        It also sounds like you're powering the hub through the cars power window fused circuit.
        Thats what a friend of mine said as well, that I was powering the hub through my cars power window circuit, But the thing is that it has nothing to do with my power window circuit, My carputer run directly to the battery??

        Could It be possible that i have the usb hub wired improperly? Like I said before, its wired to the 5v HDD wiring.

        I am using this hub http://www.radioshack.com/product/in...odsInSession=1

        What hubs are recomended to use with car pc's??

        Comment


        • #5
          I don't think it's your wiring, or hub, you're getting some type of RadioFrequency Interference or ElectroMagnetic Interference.

          There are several things in a computer that can generate noise. All computers use digital signals -- square waves rich in harmonics. These signals can be generated by the several oscillators found in most computer systems. Signals from the oscillators can interfere with the signals we want to receive. In addition to the oscillators, all computer circuits sub-divide these oscillators into signals that are sub-multiples of the oscillator frequencies. Additional digital noise can be generated by the video monitor circuits. Computers also use switching power supplies. "Switchers" can also be prolific generators of RF noise. The monitor has a separate power supply, plus sweep and high-voltage circuits that can also generate noise. When you put them all together, a computer system can generate RF signals from below the HF band well into VHF, colliding with your car's remote.
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          • #6
            I see. So what are my options for a solution.... Sorry for sounding so blunt but this is just giving me the biggest head ache..

            What im thinking of trying tomm is the following, the local pep boys has this type of 12v usb gaget

            http://www.adorama.com/LRAIDCUF.html...26211333649668

            Since usb uses 5v that means that adapter must have something in it reduces 12v to 5v. so if i just run a positive and negative lead from where the usb socket begins i can wire that to my current usb hub for the 5v power instead of using my HDD, correct? And if it doesnt work then the most ive wasted was a half hour of my time and 10 dollars.

            Do I have a good thought going or is it going to be a waste of time?? Oh and sorry about my wording on this post, I didnt exactly know how to explain what I wanted to do, Hope you understand

            Comment


            • #7
              I was thinking along the lines of something like an Universal plug-in auto adaptor for 12Vdc - 13.8Vdc cigarette socket, switchable from 1.5V-12V.

              that might work, it's worth a try.
              Check out my CARPC: Project Diamond Plate

              Quick Reference:
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              • #8
                thanks for all the help man. i will give it a try tomm and let you know how it turns out.!!

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                • #9
                  N/P dj.

                  If not, it's definitely interference from your remote transmitter.

                  Let me know how other functions from the remote react while your pc is turned on. trunk lock, alarm, etc...try them out and observe your pc to see if the problem arises.
                  Check out my CARPC: Project Diamond Plate

                  Quick Reference:
                  CPU Electrical Specs
                  Power Supply Calculator

                  Video Connections for newbies
                  Temperature Converter
                  Voltage Calculator

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                  • #10
                    Where is your PC located?

                    Comment


                    • #11
                      Originally posted by EvilMonkey View Post
                      Where is your PC located?
                      In my trunk.

                      Originally posted by dMand View Post
                      N/P dj.

                      If not, it's definitely interference from your remote transmitter.

                      Let me know how other functions from the remote react while your pc is turned on. trunk lock, alarm, etc...try them out and observe your pc to see if the problem arises.
                      Alright well I gave it a try. I soldered 2 wires for the positive and negative lead on the little pcb board for 12v and 2 wires for the positive and negative lead on the 5v. I connected everything and it works great with one exception.

                      I wired the 12v side to my amp remote and ground wires, if I have it wired to the remote wire the amps wont turn on, BUT if I wire it directly to the positive and negative of the amp (basically directly to battery) it works just fine?? Don’t know why. But with the 12v connected directly to the amps everything works great, the computer does not lock up any more!! The only thing that is on if it is connected directly to the amp is the little led in the USB hub, so it would stay on constantly. I don’t see that being a problem because LED's take hardly any power, so I don’t for see the battery dying due to the little led. I will go ahead and try and different 12 volt switched source and see of that makes any difference.

                      Also, I think you misunderstood me on one thing, it doesn’t only freeze when I unlock the doors via remote, it’s also if I were to do it inside the car. I don’t believe it has anything to do with the remote, but more of what you said before with the power spike when the relay for the locks gets activated!

                      Comment


                      • #12
                        I suspect the power door locks are causing a power dip, not a power spike, causing the PC to lock up. It also sounds like it's possible your power supply is right at the edge of putting out as much power as it can, where the USB hub is just enough to push it over the edge.

                        What power supply are you using? Is it an M2-ATX by chance? The remote amp wire from that is not capable of providing enough power for a USB hub.

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