Cannot upload sketch to UNO

Development Boards Arduino
1

Hello,

I have a new UNO R3 and after uploading sketches several times successfully, the board seems to no longer be able to receive uploads. The avrdude output looks like this:

avrdude: Version 5.11, compiled on Sep  2 2011 at 19:38:36
         Copyright (c) 2000-2005 Brian Dean, http://www.bdmicro.com/
         Copyright (c) 2007-2009 Joerg Wunsch

         System wide configuration file is "C:\Users\IBM_ADMIN\AppData\Local\arduino-1.0.2\hardware/tools/avr/etc/avrdude.conf"

         Using Port                    : \\.\COM8
         Using Programmer              : arduino
         Overriding Baud Rate          : 115200
avrdude: Send: 0 [30]   [20]

after that initial send, avrdude is stuck and it stays hung like that. No error messages, just stuck.

FWIW, I have another UNO board and I am able to plug that one in and upload without any problems (it shows up on COM7).

I was curious whether the MCU was bad so I swapped the MCU’s and the problem stayed with the board (the good board was good with either MCU / the bad board was bad with either MCU) so I know it is not that.

I tried uninstalling/reinstalling the driver on COM8, that also had no effect.

Does anybody have any ideas on what to try next to diagnose the problem?

Thanks,

Andy

2

Hi Andy,

Sorry to hear you are running into issues with your board. My guess is that something with the ATMega16U2 chip on your board is bad or there is an issue with the reset line on your board. Try pushing the reset button and releasing it after you hit the upload code button. You may also want to check out the circuitry on the board and see if there are any cold joints on the ATMega16U2 chip. Can you reinstall the bootloader on the bad board via ISP?

If you are still running into issues with it, email us at techsupport@sparkfun.com, and include your order number. We can work with you from there.

3

SFE-TS-Toni,

Thank you very much for taking the time to respond.

I was able to resolve my problem! I came across a very good troubleshooting guide here: http://www.arduino.cc/en/Guide/Troubleshooting#upload

Based on reading that guide I disabled some Bluetooth devices and rebooted the machine. One or more of those changes caused it to start working again, I’m not sure which. So it turns out there was nothing at all wrong with the Arduino board itself. I also have no idea what triggered the COM port to stop working. But it’s Windows so go figure.

Andy

4

Glad to hear you got it fixed! Best of luck with your projects!