A line following robot follows a black line about 3/4 inches in width on a black surface.
These robots are usually used in compititions. According to rules, the robots are raced one at a time and the robot with the shortest time wins. the curves in the lines must be 4 inchces or more in diameter.
Please find the attachments"Line Follower ROBOT Microcontroller 8051 seminar report/pdf/ppt download" here....