Arduino Forum

Using Arduino => Installation & Troubleshooting => Topic started by: JMHuss on Feb 19, 2011, 09:49 pm

Title: Uno not recognized as USB
Post by: JMHuss on Feb 19, 2011, 09:49 pm
So I'm afraid I may have nuked my Uno.  Last night it was working fine and I was playing around with a couple of DC motors.  At first I was driving one motor via an H bridge using the onboard 5V pin as my power supply, and it was performing as I expected.  I added a second motor to the H bridge, and shortly thereafter I tried to upload a new program to the board.  The Arduino software erred, stating that my COM port wasn't found.  I'm thinking maybe I overdrew the board because of the second motor.

Now when I plug in the Uno, the green 'ON' LED near the reset button lights up.  However, the Uno doesn't show up in my Device Manager at all anymore.  I'm running Windows 7 Ultimate as an admin.

Did I kill my board?  Is there anything I can do to try and recover it?

Thanks,
Jonathan
Title: Re: Uno not recognized as USB
Post by: retrolefty on Feb 20, 2011, 01:02 am
Quote
Did I kill my board?  Is there anything I can do to try and recover it?


Try a different USB port on your PC, or even better a different PC. You may have damaged the USB port on the PC by drawing too much current. The Arduino board has a 500ma polyfuse that tries and protect the PC's USB port from overcurrent but it's a slow acting fuse, and perhaps your PC usb has an internal protection fuse that blew open first.

Lefty


Title: Re: Uno not recognized as USB
Post by: JMHuss on Feb 20, 2011, 02:31 am
Yep, tried both another USB on this machine and another machine altogether.  Same results.  I also tried a different USB cable, so it's got to be something with the board itself, I think.

Thanks,
Jonathan
Title: Re: Uno not recognized as USB
Post by: Nishant_Sood on Feb 20, 2011, 12:19 pm
possibly you didn't kill it , however if you have ensured it's not making any short-circuits, and no 2 motor's can make your arduino go dead , if wrongly wired then the motor's will not just work that's it,
unplug the arduino>give a restart (Computer)>plug in the Arduino again.

in most of the cases this remedy work's as in mine(had seen such problem a lot many times had one even today)
Title: Re: Uno not recognized as USB
Post by: JMHuss on Feb 20, 2011, 07:06 pm
There's absolutely nothing connected to the Uno except the USB cable.  I've rebooted a couple of times since the issue started, as well as tried a separate machine completely.

Thanks,
Jonathan
Title: Re: Uno not recognized as USB
Post by: Nishant_Sood on Feb 21, 2011, 02:01 pm
that's something unusual trying with the same arduino IDE pack? or installed fresh IDE on other System's?
Title: Re: Uno not recognized as USB
Post by: JMHuss on Feb 22, 2011, 03:04 am
I didn't install the IDE on the second machine.  I just connected the Uno to the machine to check if it would be recognized as a USB device.  It wasn't.

Thanks,
Jonathan
Title: Re: Uno not recognized as USB
Post by: Nishant_Sood on Feb 22, 2011, 10:35 am
sometimes the svchost and other group of viruses run that definitely block up your COM ports like i experienced once using the WINAVR not arduino IDE when i was loading bootloader through my home made Serial Programmer so there could be several MAL-scripts running or would you have messed with the ATmega 8u2 USB chip , any place you tried to have your UNO enter a DFU mode if not then somthing is suspicious with UNO's Hardware.