Line follower is an autonomous robot which follows either black line in white are or white line in black area. Robot must be able to detect particular line and keep following it. For special situations such as cross over’s where robot can have more than one path which can be followed, predefined path must be followed by the robot.Line following is a task in which robot has to follow the line. It must be capable of taking various degrees of turns to follow the curved lines also.The Line following Robot moves to follow a line drawn on the floor. This Robot follows the black line which is drawn over the white surface . 

Line follower robot is a bot which can follow a particular line. Its  a very good project to start with, for people who are interested in robotics and embedded systems.In this case, it will follow a black line on a contrasting white background surface.This bot comprises of a sensor section, driver section and a microcontroller to process the sensor values and correspondingly operate the motor driver section.Sensor section consists of IR sensors (2 in this case)Driver section involves the working of geared DC motors (via L293D IC) 

This circuit describe a simple line following robot which a you can easily make in your homes because it does not contains any complex digital circuitry and this can be made without using any microcontroller.  In this circuit the robot the will follow a white line on black surface. This simple circuit is made with the help of single IC that is L293D and few more commonly known components like LDR and LED. LDR which is working as a sensor here. LDR is basically made up of semiconductor material. Semiconductor material has energy band where electrons and holes exist.