.[/quote]
It's not really any different to a light following robot, you just need to provide a strength signal from each microphone - the robot simply turns towards whichever side is the strongest, trying to keep both the same strength.[/quote]
yes exactly and this is the reason..i said i am in doubt why there is no URL on the net.
it is not so hard and what we need rather than photodiods is a couple of mics and amplifiers...
i think as my first robot project (with th microcontrollers) it is very better that i make an sound robot and not a line following robot,
a sound robot is funnier