Also, the Arduino IDE software on my Ubuntu 12.04 does not see the Arduino when I plug in the USB cable. When I click on Tools from the IDE menu, the Serial Port entry is greyed out. The same thing is true when I connect the Arduino to my Windows computer. The IDE software in Windows has the Serial Port entry greyed out as well.
I tried resetting the Arduino by pressing the reset button. Nothing happens. I also hold down the reset button while plugging in power. Again, nothing happens.
I did some research on the internet. I think the problem is that either
- the AT chip is bad or
- the bootloader software on the chip got erased or corrupted and needs to be reloaded.
I found a page that talks about how to update the firmware on the Arduino. Not sure if this will work but I'll have to give it a shot.