How to Construct a Line Follower Robot

What is line follower robot?

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For my mini project, I decided to make a line-follower robot. This simple robot is designed to be able to follow a black line or white line on the ground without getting off the line too much. The robot has two sensors installed underneath the front part of the body, and two DC motors drive wheels moving forward. A circuit inside takes an input signal from two sensors and controls the speed of wheels’ rotation. The control is done in such a way that when a sensor senses a black line, the motor slows down or even stops. Then the difference of rotation speed makes it possible to make turns. For instance, in the figure on the right, if the sensor somehow senses a black line, the wheel on that side slows down and the robot will make a right turn.

Download for the design is given below

Line follower robot : circuits for black line

Line follower robot : circuits for white line