Results 1 to 5 of 5

Thread: Powering on/off USB Cam.

  1. #1
    FLAC ShawJohn's Avatar
    Join Date
    Aug 2004
    Location
    On the edge!
    Posts
    1,790

    Question Powering on/off USB Cam.

    I have just bought a smart little webcam with night vision, the picture is very good, even in the dark, one problem however is that the camera has 6 little super bright LED's that come on automatically when needed, trouble is that they will be on at night when driving and white lights on the back of a car going forwards are highly illegal.

    If I put a switch on the lead so it comes on automatically then the PC will have to re-detect it and install drivers each time.

    Anyone know of a way to turn USB devices on and off through software without the drivers having to re-load all the time?

    John

  2. #2
    kuo
    kuo is offline
    Variable Bitrate kuo's Avatar
    Join Date
    Jun 2003
    Location
    Greensboro, NC
    Posts
    439
    use devcon to disable and re-enable devices.
    http://support.microsoft.com/default...;EN-US;Q311272

  3. #3
    FLAC ShawJohn's Avatar
    Join Date
    Aug 2004
    Location
    On the edge!
    Posts
    1,790
    But would Devcon actually turn off the power to the Camera because if not the lights won't go out.

    The only other idea I've had is to make a small circuit with an LED on it and fix it directly above the light meter on the webcam, and have the LED turn off when its dark and the car goes into reverse. That way the camera is functional all the time, but the lights will only come on in reverse and in the dark.

    Anyone know why one of my systems will autodetect and install USB hardware without intervension when the other one prompt for the location of drivers everytime?!? They were both setup with the same version of XP-sp1?

    John

  4. #4
    Maximum Bitrate mushin's Avatar
    Join Date
    Aug 2004
    Location
    SE Michigan
    Posts
    750
    You could also put a relay in line on the USB power pin, and have it actuated by the reverse light line. This makes it a hardware rather than a hardware solution, but should effectively make it "plug in" when you go into reverse, and "unplug" when in park or drive. There might be a slight delay as XP detects the device, but it should be easier to do than wiring up your own LEDs. Just a thought.

  5. #5
    Newbie
    Join Date
    Jan 2005
    Location
    UK
    Posts
    44
    yeah i agree with mushin. My first thoughts on it were to use a multimeter to determine which one of the wires in the USB group of wires was +volts, then put a toggle switch on it

Similar Threads

  1. Problem with ITPS / hibernation and External USB HD
    By veetid in forum Power Supplies
    Replies: 5
    Last Post: 01-02-2006, 08:35 PM
  2. Powering on/off USB Cam.
    By ShawJohn in forum General Hardware Discussion
    Replies: 0
    Last Post: 01-27-2005, 12:30 PM
  3. On/Off switch to USB
    By WhiteWolf_DK in forum GPS
    Replies: 13
    Last Post: 10-16-2004, 01:38 PM
  4. Powering USB 2.0 Hub off HDD +5v Rail - Any problems?
    By sq_geek in forum Power Supplies
    Replies: 12
    Last Post: 06-07-2004, 09:11 PM
  5. powering some usb devices
    By cubanmoses in forum General Hardware Discussion
    Replies: 7
    Last Post: 10-08-2003, 11:23 AM

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
  •