Before you do anything with an Arduino Uno

2011-03-01 21:31:00

And especially before you run the DigitalReadSerial example, upgrade the firmware. To get it into DFU mode, use this image rehosted from here because imageshack seems unreliable to me.

Also, the version in the Ubuntu 10.10 repositories does not support the Uno but install it for the dependencies. Then download the Arduino IDE 22 and use it in place. No problems so far.

The link to the 64-bit download for the Arduino IDE 22 is on the Google Code page not on arduino.cc.