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Thread: Wiring?

  1. #1
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    Wiring?

    Not sure if this is the right forum but figured it is a place to start. I have a compaq desktop computer that I am putting in my Firebird for a carputer for my KITT conversion. I have already figured out that the m4-atx will work for the power supply. What I am wanting to do is on the front panel of the computer it has a usp connector as well as a card reader. I am wanting to put this panel in the front of the car so I have to extend the wires from the panel to the motherboard since the computer will be put in the back of the car. I should be able to cut the wires and splice in longer wires to accomodate this. Planning on using the ribbon style cable for this project. Just wondering if anyone sees any problems with doing this. Just figured since they are just wires that extending them wouldn't be a problem. Any input on this is greatly appreciated.

  2. #2
    Newbie guillemasco's Avatar
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    Just go to any computer store and buy an usb extension and a VGA extension. both are chip and work great.
    Carpc: 90%
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    First CarPc in Argentina!!

  3. #3
    Maximum Bitrate FusionFanatic's Avatar
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    you can extend the USB cable up to ~16ft (per USB2.0 spec) but flat ribbon cable is no good. USB data wires need to be twisted and shielded to prevent electrical interference. see here for a diagram of USB cable construction.

    you would be better of getting a USB extension cable, chopping off the connectors, and using that cable instead. or use a USB extension cable "as-is" and mount an external USB card reader or HUB.

    good luck

  4. #4
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    Okay, I understand about the USB cable. What about the wires for the card reader. Any speacial wires for that that I need to know about. Thanks for the heads up about the USB cable, completely forgot about that type of cable.

  5. #5
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    I just took a look at the usb and card reader slot and they are built together with just one cable coming off of it. There are 8 wires on the connectors that go from the reader to the motherboard. If a usb cable only has 4 wires in it would I need 2 of these to make it work? If this doesn't make sence I could take some pics tomorrow of the connectors to help show what I am talking about. Let me know your thoughts on this. Thanks again for all the help.

  6. #6
    Maximum Bitrate FusionFanatic's Avatar
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    no pics needed, the card reader is USB as well. they are all like that. 4 wires for the USB slot, and 4 wires for the card reader. the eight wires (4 per USB line) plug into the motherboard's 9-pin USB header.

    also, you can buy adapter cables like this that will allow you to plug that panel right into an external USB port (or a USB extension cable). if you use a couple of these adapters, you won't have to splice or extend anything, you can simply plug it in


  7. #7
    Variable Bitrate dMand's Avatar
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    kitt350, if you plan on using multiple usb devices, it is best to get a heavy duty usb cable for your card reader and attach it to the header on the motherboard.
    Get a usb printer cable and cut it to fit. USB printer cables come in longer lengths and thicker construction, with better shielding characteristics.

    You can connect the reader via an external USB port, however, I don't recommend it due to the length of run. Read and write times will be slower due to power/signal draw from other usb devices on the same signal rail, there's also a chance of ruining the memory card with not enough 5V output. The motherboard header typically uses a separate, dedicated 5Vdc USB channel designed for the card reader, and, it is your best bet.




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