Arduino (AVR) error - avrdude: stk500_getsync(): not in sync: resp=0x00

In the context of Arduino, this error occurs when there are issues writing your program to the microcontroller.

Although there seem to be multiple potential sources to this problem, the mistake that I often find myself making is interfering with the RX/TX connections.

Therefore, try uploading your sketch after disconnecting any wires from digital i/o pins 0 and 1 (or whatever corresponds to RX/TX).


source: http://www.instructables.com/answers/avrdude-stk500getsync-not-in-sync-resp0x00-/