Cannot communicate with Arduino Uno R3
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Cannot communicate with Arduino Uno R3

by typetrice on Tue Jan 08, 2013 6:54 pm

I just received an Arduino Uno R3 (Atmega328 - assembled). Arduino IDE cannot communicate with the board. It shows up under Other devices as ATmega16u2 DFU and on the board, the green and orange lights stay on.
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Re: Cannot communicate with Arduino Uno R3

by adafruit_support_rick on Tue Jan 08, 2013 7:04 pm

Have you tried to install the drivers? The Uno uses an ATmega16u2 coprocessor chip for USB communications.

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Re: Cannot communicate with Arduino Uno R3

by typetrice on Tue Jan 08, 2013 7:29 pm

I have tried Update Driver Software in Device manager. Windows 8 searches for driver update but is unable to install driver. I have also tried on win 7 machine.
Capture.PNG
Response for automatic update.
Capture.PNG (11.63 KiB) Viewed 4038 times


When I choose the driver folder from Arduino IDE download, it does not find the driver.
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Re: Cannot communicate with Arduino Uno R3

by adafruit_support_rick on Tue Jan 08, 2013 7:55 pm

The 16u2 should not be in DFU mode. Did you purchase your Uno from Adafruit?

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Re: Cannot communicate with Arduino Uno R3

by JD3 on Tue Jan 08, 2013 8:02 pm

http://arduino.cc/en/Guide/Windows

Here is the install guide from Arduino.cc website.

You need to go to the start menu (Win7) right click on computer and select properties.
Then select device manager upper left hand corner.
Select the USB device and right click - update driver .

Then window pops up w/ search automatically or manually browse.
Select manually browse.After that it will show you the path pointing to the driver - select browse (to the right).
Select the path to where Arduino software was installed.
You cannot install drivers from the download file folder. Maybe check program files directory?

You may need to uninstall, and re install directly to the C:\ drive.
Then the drivers would be located at C:\arduino-1.0.3\drivers
That little black caterpillar you just stepped on will set you back a few bucks....
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Re: Cannot communicate with Arduino Uno R3

by typetrice on Tue Jan 08, 2013 8:56 pm

Yes I purchased the board from adafuit.com.

I have tried updating driver manually and used the drivers directory downloaded with the Arduino IDE. When I choose the drivers folder to look in (with look in subdirectories), it does not find the correct driver and says windows could not install the driver.
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Re: Cannot communicate with Arduino Uno R3

by JD3 on Tue Jan 08, 2013 9:05 pm

Try uninstalling The Arduino software and re install it, directly on the hard drive (c:\ vs. program files directory)

Sometimes re installing helps..... I had to do that for my Win7 machine.
I don't have Win8 so I can't help there. Sorry :(
That little black caterpillar you just stepped on will set you back a few bucks....
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Re: Cannot communicate with Arduino Uno R3

by typetrice on Tue Jan 08, 2013 9:26 pm

On the Win 7 machine, I tried moving the installation to C:\arduino-1.0.3 but I get same results for updating drivers.
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Re: Cannot communicate with Arduino Uno R3

by typetrice on Tue Jan 08, 2013 9:31 pm

@driverblock,
How do I correct the "The 16u2 should not be in DFU mode."?
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Re: Cannot communicate with Arduino Uno R3

by JD3 on Tue Jan 08, 2013 11:51 pm

That little black caterpillar you just stepped on will set you back a few bucks....
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Re: Cannot communicate with Arduino Uno R3

by adafruit_support_rick on Wed Jan 09, 2013 10:39 am

Sorry for the trouble, but it looks like your 16u2 must be unprogrammed. Unfortunately, this does happen from time to time. Please contact support@adafruit.com for a replacement. Please reference this thread and include your original order number

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Re: Cannot communicate with Arduino Uno R3

by typetrice on Thu Jan 10, 2013 10:51 am

Thanks,
I will follow up with support@adafruit.com.
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Re: Cannot communicate with Arduino Uno R3

by remkop on Mon May 20, 2013 7:16 pm

I bought the Adafruit ARDX - v1.3 Experimentation Kit for Arduino (Uno R3) - v1.3
(order number 279939).

Unfortunately I was unable to install the driver and the device shows up under "Other devices" as ATmega16u2 DFU.
(I'm on Windows 7 64 bit.)

Is this the same problem that typetrice had?
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Re: Cannot communicate with Arduino Uno R3

by adafruit_support_rick on Tue May 21, 2013 12:12 pm

Looks like the same problem. Email support@adafruit.com with a reference to this thread and ask for a replacement.

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