Page 1 of 2 12 LastLast
Results 1 to 10 of 18

Thread: Strange USB Issues - USB Doesnt "Stay Alive" In Car

  1. #1
    Variable Bitrate we87's Avatar
    Join Date
    Nov 2005
    Location
    Dallas, TX
    Posts
    404

    Strange USB Issues - USB Doesnt "Stay Alive" In Car

    Recently bought and installed a complete carputer from MoCoSo running on a D945GCLF2 Intel motherboard. Excellent company and products for the record

    My issue is that when I bring the computer in the house and power it using a DC Regulator, all the USB ports and USB peripherals plugged in work JUST FINE with no problems at all... However when I put the computer in the car, everything shows up but then around 10 minutes later they show up as "Unplugged" when they are not.

    For instance I have a Delorme Earthmate USB GPS, and in the car and at boot, the computer see's the GPS receiver, gets signal, works in the GPS software for about ten minutes, then for no reason what so ever, the Delorme driver says that there is no GPS receiver plugged in?

    When I use a standard flash drive, and I transfer large files, it will start the transfer, then lose the drive in Windows before the transfer is complete? (I've tried a few different flash drives, they all do the same thing. They work perfect in the house on my workbench)

    I've tried a USB CD Drive that I loaded Windows onto the computer with in the house, doesnt recognize the drive in the car.

    I have no clue why this is happening... I've check the voltage coming out of the M2-ATX and its steady at 4.92 volts. So this >should< be just fine? There is a good solid ground and 12v+ going to the M2-ATX? So where can I go from here? What would be the next step?

    Thanks in Advance for any help...
    Carputer Progress
    [||||||||||] 100%
    Finally Installed!!
    Everything is in the car and working.
    I painted the cilpboard mount and it looks good.
    Shutdown/Startup is working excellent!
    View My Progress Here

  2. #2
    What can I say? I like serial. Curiosity's Avatar
    Join Date
    Mar 2004
    Location
    Florence Yall, BFKY
    Posts
    2,684
    Are you watching the 5VUSB when it happens or or checked it once? It sounds like it's dropping. IOW, the M2 can't supply enough power.

  3. #3
    Variable Bitrate we87's Avatar
    Join Date
    Nov 2005
    Location
    Dallas, TX
    Posts
    404
    I've checked it a few times, but not actually monitor the 5v line.

    How can the M2-ATX be able to power the USB Devices when connected to the DC Regulator but not when installed in the car?
    Carputer Progress
    [||||||||||] 100%
    Finally Installed!!
    Everything is in the car and working.
    I painted the cilpboard mount and it looks good.
    Shutdown/Startup is working excellent!
    View My Progress Here

  4. #4
    FLAC
    Join Date
    Jan 2008
    Location
    Dartmouth, MA
    Posts
    916
    How hot is it in the computer? Are you sure there are no extra USB devices in the car that aren't there in the house? Do any of the USB devices use external power supplies? Do you have any USB hubs connected?
    My Nearly Complete Car:
    http://www.mp3car.com/vbulletin/show...ed-car-pc.html

    Micro Control Center... Control Your Car Across the Internet
    http://www.mp3car.com/fusion-brain/1...-internet.html

    Website: (It's a work in progress, really. All my projects have taken me from ever really developing it.)
    http://paulfurtado.com/

  5. #5
    Variable Bitrate we87's Avatar
    Join Date
    Nov 2005
    Location
    Dallas, TX
    Posts
    404
    1) Not hot at all since the weather has been REALLY nice lately.
    2) The USB devices are the exact same.
    3) No USB devices I have plugged in for now have any external power supplies.
    4) I do have one 4-port USB Hub with two devices connected to it. Touchscreen & GPS
    Carputer Progress
    [||||||||||] 100%
    Finally Installed!!
    Everything is in the car and working.
    I painted the cilpboard mount and it looks good.
    Shutdown/Startup is working excellent!
    View My Progress Here

  6. #6
    FLAC
    Join Date
    Jan 2008
    Location
    Dartmouth, MA
    Posts
    916
    When you tested inside the house, did you use the exact same USB cables you're using in the car? Did you use the same screen in the house?
    My Nearly Complete Car:
    http://www.mp3car.com/vbulletin/show...ed-car-pc.html

    Micro Control Center... Control Your Car Across the Internet
    http://www.mp3car.com/fusion-brain/1...-internet.html

    Website: (It's a work in progress, really. All my projects have taken me from ever really developing it.)
    http://paulfurtado.com/

  7. #7
    Variable Bitrate we87's Avatar
    Join Date
    Nov 2005
    Location
    Dallas, TX
    Posts
    404
    Yes.
    Carputer Progress
    [||||||||||] 100%
    Finally Installed!!
    Everything is in the car and working.
    I painted the cilpboard mount and it looks good.
    Shutdown/Startup is working excellent!
    View My Progress Here

  8. #8
    MySQL Error soundman98's Avatar
    Join Date
    Jan 2008
    Location
    on the border of northern IL/IN
    Posts
    5,848
    i wonder if you measure the 5v line when you start the computer up, and then measure it 10-15 min later to see if they match-- if the m2 is doing its job, there shouldn't much fluctuation at all(maybe 0.1volt?)

  9. #9
    What can I say? I like serial. Curiosity's Avatar
    Join Date
    Mar 2004
    Location
    Florence Yall, BFKY
    Posts
    2,684
    Other possible scenarios:

    Short USB cables in the house, long cables in the car.
    Connecting CD drive to PC in house, connecting to hub in the car.
    Connecting to amplifier in the car but not in the house.

    Find the difference. There has to be one.

  10. #10
    Low Bitrate mnwcsult's Avatar
    Join Date
    Mar 2007
    Location
    Maryland, USA
    Posts
    90

    Hub's could be overloaded

    Go into Control Panel. I am presuming you are using Windows as your OS.

    Select System, then Device Manager. Find "Universal Serial Bus controllers" and click on the plus to open it.

    You are looking for "USB Root Hub", you will have as many as you have hubs. Click on the first one, the click the Power tab. It will tell you whether the hub is self powered or powered. And the Total amount of power available: 500 mA per port. So a four port hub "should" be able to sink 2000 mA, or 2A. Thats 2A times the number of four port hubs available.

    You will also see what devices are attached and their Power Requirements. Say a Bluetooth adapter around 50 mA. Another hub connected to it 400 mA. USB hard drive 500 mA.

    My guess is that the ones drawing 500 mA can probably draw a lot more. I have a hauppauge USB TV stick. It's documentation suggests that it be on a hub by itself if the hub is unpowered. Experience shows me it can coexist on a powered hub with a Bluetooth adapter.

    I also have a Seagate FreeAgent USB drive that derives all of it's power from the hub and can be the only thing living on it powered or otherwise.

    What is happening is that certain devices will draw more current than their ratings show, hard drives in particular. And will monopolize the entire hub.

    You will have to try different combinations to see what is actually stable. You may also want to power all of the hubs through a voltage regulator.

    Good Luck

Page 1 of 2 12 LastLast

Similar Threads

  1. HFP for Linux Bluetooth Hands Free
    By samr7 in forum Linux
    Replies: 105
    Last Post: 04-25-2012, 05:45 AM
  2. Replies: 9
    Last Post: 06-08-2006, 05:15 PM
  3. Problem with ITPS / hibernation and External USB HD
    By veetid in forum Power Supplies
    Replies: 5
    Last Post: 01-02-2006, 08:35 PM
  4. USB power issues - opinions please
    By zaxxon in forum Power Supplies
    Replies: 2
    Last Post: 07-20-2005, 10:03 PM

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •