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Author Topic: Windows doesn't recognize Arduino  (Read 2804 times)
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I've been using Arduino UNO successfully for a while now, but about a week ago, it stopped connecting to my computer (Windows 7 Home Premium, 32 Bit).  I had successfully used it for about 6 months before this (uploading sketches, establishing a serial connection with programs on the computer, etc.).  It's not just that it doesn't work with the Arduino IDE; when I plug it in to the computer, absolutely nothing happens.  I can't see the Arduino in device manager, and the Arduino IDE doesn't see it either.  When I hit the reset button on the Arduino, the "L" button flashes which, if I am not mistaken, means that there is a boot loader on the board?  I know it's not the computer, as I was able to test it(the computer) with a friend's UNO (exactly the same board), and everything worked perfectly.  When my board stopped working, I had it hooked up to a circuit, and it was working fine (it was set up with a serial connection to Processing), and then a few minutes later, I went back to it, and it wasn't working.  If anyone has any ideas as to how (or if) I can fix it, I'd really appreciate it.
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Tucson, AZ
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Did you test your board on your friends computer?
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I haven't tried it on his computer specifically, but I have tried it on two other computers with no success.
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At this point I think it may be a problem with the USB to TTL converter on the board (although I really have no idea, as I am kind of a Newbie at this  smiley-lol).  I have an external USB to TTL converter; are there any tests I could perform with this to see if this is the case?

Thanks,
thegadgetguy
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If the firmware has been corrupted on the 8U2, then you might be able to revive it by following these steps:
http://arduino.cc/en/Hacking/DFUProgramming8U2

The 8U2 and 16U2 on the R3 UNOs is responsible for the USB to serial conversion.
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Thanks for the response, I will try those instructions as soon as I get a spare minute.    I have confirmed that that is the problem, as the board worked fine this afternoon with an external USB - TTL converter.  I have an arduino R2, not an R3 - will that affect things?

Thanks so much for the advice!
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