avrdude : stk500_get sync attempt 10 of 10 not in sync : resp=0x20 how do i get pass this error for ardunio uno board
There are multiple reasons why you are getting this error.


Bootloader is either missing or corrupted. This is fairly unlikely.
Wire connected to pin 0 (RX)
Wrong COM port is chosen within the arduino IDE.
Drivers are not installed. You can update it within the Device Manager if you are using Windows.


Here is a link to an article explaining the causes and how to fix them, http://www.instructables.com/id/A-solution-to-avrdude-stk500getsync-not-in-syn/