Once again…
January 28th, 2010
I installed arduino on a new computer and once again got this error:
avrdude: stk500_getsync(): not in sync: resp=0×00
avrdude: stk500_disable(): protocol error, expect=0×14, resp=0×51
If you have the old style (1.0) of ardupilot, make sure you are using the board settings for Arduino Diecimilia (Atmega168)