DC 6V 2-wheel Robot Smart Car Chassis with Speed Encoder for Arduino. The mechanical structure is very simple and easy to install. An excellent platform for Line Following robots and Maze Solving Robots. The chassis has enough room for all the necessary electronics. This robot chassis together with Arduino UNO R3 makes an ideal DIY project Kit.
This car chassis comes with encoder disks, you can use two encoders with these disks to measure the speed and velocity of the robot car. It gives you the freedom to implement multiple kinds of the line following algorithms like PID.

Complete Kit
Package Included:
1 x Arduino Uno
1 x Data Cable
3 x Infrared Sensors
1 x Motor Driver
2 x Motors with Tires
1 x Chassis with screws and Nuts.
1 x Battery Holder
1 x Front wheel

How does a line follower robot work?

The workings of a line follower robot are pretty straightforward. These robots have the capability to detect a black or dark line on a lighter surface depending on the contrast. They estimate whether the line underneath them is shifting toward their left or right as they move over them.