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Thread: First CarPC 2004 325CI, need suggestions

  1. #1
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    First CarPC 2004 325CI, need suggestions

    I am finally getting around to installing all my gear in my car but I have noticed that many usb peripherals are super picky depending on what usb port they are connected in. Using the jpeg as my schematic, i have a usb sound stick, wif and xm radio direct to the computer but 5 other things via a 7 port powered (5 v for the actual carpc). So my question is, are any of these going to have problems connecting to a hub (touchscreen, keyboard, gps, obdpro, or ibus)?

    thanks in advance

    caenis
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  2. #2
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    I have tried my touchscreen, and gps and they work fine. I would be cautious of your 5V rail. Make sure ur not trying to draw too much current.

  3. #3
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    thanks bxsteez, actually trying out the usb devices all together i noticed that 1) the xmpcr, usb audio roadie and wifi definitely cannot be connected to a hub. In fact, even on the front usb headers they had problems, I had to connect them directly to the back usb ports from the motherboard. 2) when i have these things connected, i can no longer use an unpowered hub on front header ports. So I plan not use the front headers and connect the input devices (touchscreen and keyboard/mouse receiver) and the gps as well as the ibus and obdII connector (since both of these get the power from where they are being connected) to a powered 7 port hub. Also, the 5V raid is drawn from the extra molex connector on the m2atx. Using a molex to floppy adapter, the hub has a floppy power connector to use if you do not want to use a wall adapter.

    Also, have you (or anyone reading this) used a SVEN? I was told it would help the sound (since it is unbalanced) from a computer to an amp (since it usually receives powered sound from aftermarket stereos). Thanks in advance!

  4. #4
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    Hmm that is a strangely picky motherboard. I almost wanna say that it is defective. Maybe it doesn't work because of lack of power? Have u made sure that ur hub doesn't back drive the motherboard? I've never used SVEN so i have nothing on that one.

  5. #5
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    I would actually have to blame the hub first because I can use the gps, mouse, and touchscreen through the front usb headers, its just when i connect a hub there that I have problems. I do believe that the reason for failure is lack of power as well...so i am hoping that the powered hub will do the trick. Its going to be extremely hard using 9 usb devices with only 6 usb ports :-

  6. #6
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    When you connect the hub to other ports it works? I'm not sure if ur powered USB hub is going to fix anything if ur drawing ur power from the same supply. You will still be drawing the same current from the 5V rail and it may not be enough. You may have to use POL and get 5V from ur unregulated 12V from the car.

  7. #7
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    I'm about to try building my own 6V power supply to run a hub so I don't overdraw my PSU, I'll let you know how it turns out. I used a voltage regulator off the accessory line to power a USB port for power to my GPS handheld without a problem in my old car.

    Last night in testing I was running my XM Direct 2, bluetooth, and Andrea mic off the hub using wall power without a problem.

  8. #8
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    Well, I was thinking of the problem and drawing too much power like bxsteez said but the the usb devices work if everyone is connected without a hub (the ones that seem to need more voltage do need to be connected to the back ports though) but as soon as I use a hub, the devices connected to the hub reset every few seconds.

    And since strikeback tested those things with a powered hub, I am hoping that I will not have any problems. Hopefully I will start installing most of the devices this weekend. I plan to install the speakers and amps first, then the computer and last the devices.

    One thing strikeback, how many things are you connecting to your PSU? Because I have an m2atx and it has connectors for the motherboard, 2x4 for cpu and two molex connectors for hdd, roms, etc. I used one molex for the hdd and the other I will connect via molex to floppy adapter to the powered hub. I think that if you have the same setup, you should have to problem using 5V (although you said 6V) from there.

  9. #9
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    Now that is a strange problem. What kind of Hub?

  10. #10
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    The hub that I have is http://www.iogear.com/product/GUH275/ but I bought http://www.coolgear.com/images/usb-g...user-guide.pdf, you don't think it will make a difference?

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