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Thread: Too many USB devices

  1. #1
    Maximum Bitrate Dragonknell911's Avatar
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    Too many USB devices

    Alright I have about 13 USB Devices, which i need connected to my pc
    4 1.1 devices
    1.1 Keyboard lighted
    1.1 Videogame Joystick/controller
    1.1 calculator
    1.1 touchscreen

    7 2.0 devices
    2x 2.0 Webcam
    2.0 DVD Burner
    2.0 CF Reader
    2.0 ipod
    2.0 flashdrive
    2.0 printer

    2 devices which only require power
    Power phone
    Power Bluetooth headset

    I'm wondering if anyone has a good solution for how I should connect / power these. My PC is mounted in my trunk, and I drive a honda civic, (about 10' cable length is required to get to my dash, which is where these will be connected, all except for the cf reader). The only thing i've thought of so far was to buy a pci card with 5 usb 2.0 ports run 5 10' extension cables, and run a unpowered 4 port usb hub to the front of the car for the 1.1 devices.
    I was also wondering what kind of stress this might put on my opus 150. Thanks
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  2. #2
    Low Bitrate grimor2000's Avatar
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    get a hub or 2 with external power (12V or 5V) and get a dedicated PSU for them
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  3. #3
    Maximum Bitrate Dragonknell911's Avatar
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    That is what I was considering doing originally, but do you think that in conjuction with each other they will use too much of the bandwith? i.e. dvd and two webcams on the same cable together. Thanks
    and can you suggest a dedicated 5 volt psu
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  4. #4
    MySQL Error Scouse Monkey's Avatar
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    well hopw many usb ports do you have?


    you need to look at how much you will use each item and how muchbandwidth and power they need if usb powered. (the max any item will draw is 500mA).

    Put things like DVDs on their own port if possble - shared only with occasional an/or low bandwidth devices.

    For the usb 1.1 devices you list I would go with a powered hub.

    The most all those devices will draw is 3.5A + a little bit for the powered hubs. YOu can connect the hub power input to the opus directly and switch them to powered. But the actual max with all running will be less than 3.5A and you wont be using all at the same time.

    I would try it and if you get problems try something like the carnetix POL 5V for things like the DVD drive as these will be the most power hungry. You can switch this using your opus and a relay.

  5. #5
    Maximum Bitrate Dragonknell911's Avatar
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    Okay so what i'm wondering is, is it the cable that places the limit on the bandwith, or is it the usb 2.0 bus?

    If it's the cable, then simply giving them each their own port will solve my problem (but I will have to run many extension cables).

    Or is it the bus that limits the amount the bandwith? In this case I would need a minimum of two more usb 2.0 cards.

    I will be using the dvd drive frequently and the webcams and cf reader constantly.

    Thanks!
    REBUILDING!!

  6. #6
    MySQL Error Scouse Monkey's Avatar
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    well 1st off. dont run a usb powered device more than 5m from the port. 2-3 is best.

    and how many damn usb ports have you got?

    the port will limit the bandwidth. ie you dont want your DVD and webcams on the same port. DVD needs a high sustained transfer rate - firewire is much better for this so if you have that use it.

  7. #7
    Maximum Bitrate Dragonknell911's Avatar
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    Sorry I did'nt respond with how many USB ports I have!
    a) I forgot (completely my fault)
    b) It's freezing and storming outside rain/snow/sleet/wind (where my pc is)
    c) But, I have 6 2.0/1.1 ports with the Intel ICH4 Chipset

    Unfourtantely the motherboard is a cheap micro-atx board I bought two-ish years ago (intel) so no firewire.

    The devices wont be run more than 5m. But is that distance for data or power?

    ps - thanks for helping
    REBUILDING!!

  8. #8
    MySQL Error Scouse Monkey's Avatar
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    not sure about the distance but I would say a combination of both. power will drop and the data will be messed up.

    6 ports!!!! you have nothing to worry about.

    run the 1.1 devices off a single powered hub.

    Then run the DVd drive off a usb2 port (powered by the opus - you can splice into the USB cable at the PC end or run a cable up).

    Then hub the webcams off another powered hub.

    then run the other stuff off another powered hub.

    You may be able to combine the latter 2 hubs into one but look for some cheap hubs. that uses 4 ports and leaves you 2 for other devices neat the Pc you might add - eg wifi or bluetooth.

  9. #9
    MySQL Error Scouse Monkey's Avatar
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    you could also elect to split the webcams up but they should not be stressing the usb2 bandwidth tbh. YOu should be able to run the webcams, CF and other usb2 stuff off one port but that would require a 6 port hub so getting 2 fours might be easier and should be better.

  10. #10
    Maximum Bitrate Dragonknell911's Avatar
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    Awesome that should be easy enough.

    Just purchased a powered hub off ebay. 7 ports (overkill but happened to be cheapest, and ship from the USA) and is powered.

    When you say splice into the usb cable at the end, are you talking about cutting the ac-dc adapter and splicing the cable onto the power of the usb cable? (for clarification, connecting the power input of the drive which looks like a standard little circle with the pin in the center, to the 5v/grd power wires on the usb?)

    Thank you for all your help.

    ps the CF card reader is what im inteding to boot off of. =)
    REBUILDING!!

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