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Topic: [Solved]Arduino Uno usb setup issues (Read 906 times) previous topic - next topic


Apr 03, 2011, 10:21 pm Last Edit: Apr 05, 2011, 12:02 am by _cj_ Reason: 1
Hello, I am new to arduino. I recently just purchased an Uno (surface mounted version) from sparkfun. I am following the tutorials from this site ( http://arduino.cc/en/Tutorial/DigitalReadSerial ) and I have ran into an issue on my second lesson. I am able to upload sketches, but I am not able to use the serial monitor. I am wondering where I went wrong on my setup. I get an error as follows:

edit: or

when I attempt to use it. I am running Ubuntu 10.04 LTS - the Lucid Lynx 64 bit. I have installed thee rxtx package. dmesg shows:

Code: [Select]
[  850.430247] usb 4-3: USB disconnect, address 2
[  863.200575] usb 4-3: new full speed USB device using ohci_hcd and address 3
[  863.430257] usb 4-3: configuration #1 chosen from 1 choice
[  863.434059] cdc_acm 4-3:1.0: ttyACM0: USB ACM device

My preferences.txt file is pastebin'd here : http://pastebin.com/sH3UPA1k
I have attempted to run as root and it did not fix the issue.

2nd edit:
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sudo aptitude remove brltty
fixed it for me after a reboot just long enough for me to upload another sketch, however the moment I tried to view the serial console I am back where I started from. I am curious to know what boards need to have the firmware updated. I have the smd version and I do not know where the serial number is, or which ones are bad.
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sudo lsusb -v -d 2341: | grep bcdDevice
gives me:
Code: [Select]
bcdDevice            0.00


Apr 04, 2011, 08:24 pm Last Edit: Apr 04, 2011, 08:26 pm by mrtaylor Reason: 1
Try the following command with the UNO plugged into the usb port and the serial console open.  Please post the output.

lsof 2>&1|grep ttyACM


bcdDevice            0.00

old firmware
what boards need to have the firmware updated

Atmega8U2 firmware: my opinion, if your running linux all the Uno boards. 


Apr 05, 2011, 12:02 am Last Edit: Apr 05, 2011, 12:06 am by _cj_ Reason: 1
Ok... I was a bit skeptical having just purchased a brand new board and finding out I need to attempt something that could destroy it (afaik) in order to do anything other than blink an led. Being a Linux user, I know that NOTHING is ever easy to do when it comes to this sort of OS, so I just decided I'd grow a pair and update the firmware -- after all money is only paper right? Well all is well, and my serial issues are no longer existent.

the most informative being this single picture from this post:

made this process absolutely simple. Thank you.

Why are these devices still shipping with an older firmware if a new one appears to fix several issues?

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