BUZZ ZZZZZZ, she can not take it anymore captain !!
A while ago I built a lego line tracker that won the forum compotition ( as mongke ) over at lego mindstorms.
Heres a quick video of it walking for those who want to see a lateral way to solving a design issue, "build a line stepping robot.." well it steps dosnt it ? and it follows a line so it completes the criteria. any way here it is for you all to see. (flash).
It changes the motors direction based on the light sensors, and in the true sense it is actually a line avoider not a tracker, its logic is to get to the end and get away from the big bad line, pity it didnt get told to turn around first...