In this project based on black line follower and white surface.
The line follower is an automated self-driven vehicle in which follows the line. In general, there are two types of line follower. one is a black line follower which follows the black line and the second is a white line follower which follows the white line. Line follower actually senses the line and follows it. These types of line followers are used in the industries, food restaurants for food delivery, the medical field for transmitting the medicine to the required patients, etc.
 
 Refer Blog for more details.  
https://www.dofbot.com/post/line-follower-bot-using-arduino-uno
 
 
Demo video:
https://www.youtube.com/watch?v=Hw_zxOmtWj0