Detecting voltage signals on USB port

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Hi,

I am trying to detect a fixed voltage(etc 5 Volt) on a wire, initially I used parallel port and it was working fine.
Can anyone help me to detect the same on USB port ?
I am using C# for the project..

Thanks,
Puneet.

Posted 13-Apr-11 1:17am

puneetdhawan2000

Updated 13-Apr-11 1:18am

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Toli Cuturicu 13-Apr-11 8:11am

Google?

apaka 13-Apr-11 11:04am

Try using http://sourceforge.net/projects/libusbdotnet/

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E.F. Nijboer · Answer 1 · 2011-04-13T02:02:00

Solution 1

You can use Windows Management Instrumentation for that.

Have a look at these articles:
How To Get Hardware Information (CPU ID, MainBoard Info, Hard Disk Serial, System Information , ...)[^]

Windows Management Instrumentation (WMI) Implementation[^]

Good luck!

Posted 13-Apr-11 2:02am

E.F. Nijboer

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puneetdhawan2000 21-Apr-11 3:44am

Hi, Thanks for the information, but these can only be helpful in showing the information about the devices, and not the data/signals from USB.
I think that any voltage/current cannot be detected directly from USB port ??? :(

Thanks.

E.F. Nijboer 21-Apr-11 5:40am

Normally the USB would supply approximately 5 volt and 0.5 mA. (http://www.hardwarebook.info/Universal_Serial_Bus_%28USB%29) To measure it you could something like this:
http://www.instructables.com/id/USB-Voltage-and-Current-Tester-version-2/
But I don't think it is possible to get a good reading from pc software. I also think that you can't simply compare usb with a parallel port, but maybe a usb-to-parallel module could also help out.

puneetdhawan2000 27-May-11 2:37am

Hi,
I learned many things using the link (and the site you reffered). Thanks a lot for that.
It took me away from the actual problem for a few days :), I am still working that.

Thanks a lot.

E.F. Nijboer 27-May-11 8:20am

Nice that it could provide you an interesting journey away from your actual problem. By the way, several years ago I also got somewhat interested in electronics and got me a nice experimental USB interface kit. Just for the fun of it and also to get some nice soldering practice. It is a fairly cheap (< $50) USB board with some digital and analogue in and output. Maybe this is something that can be used or gives some new inspiration to solve the problem. Check out these links for more info:
http://www.velleman.eu/distributor/products/view/?country=be&lang=en&id=351346
http://www.apogeekits.com/usb_interface.htm