Hi Friends,

Does any one knows the difference between KH Quad Board V2.1(Atmega168) & V3.0 (Atmega328 PA) ?

This one
http://www.hobbyking.com/hobbyking/store/uh_viewItem.asp?idProduct=19534

And this one
http://www.hobbyking.com/hobbyking/store/__21977__HobbyKing_Multi_Rotor_Control_Board_V3_0_Atmega328_PA_.html

V3.0 seems more advanced but not sure on what new features it had.

Thank you,
Atul

Atmega 328 offer more memory to hold bigger firmware than Atmega 168.
Almost all of the currently released firmware can be used with atmega 168. So right now there is no such advantage of using Atmega 328(if you are using it for tricopter of quadrotor. I dont have any idea about othe multirotors). But in future if some bigger firmware is released then atmega 328 will be useful.

Thank you spitfire !

Anyone else knows other difference?

+1 to spitfire. just memory difference nothing more.. If you are looking to use it for basic flying, not doing any tweaks to codes or adding new or larger firmware then ATmega 168 is good for you.

Is it equal to Arduino board?

nopes... its bit different but it uses same processor.

any one know to program this :https://www.sparkfun.com/products/8785