“Raspberry Pi Pico Projects
Concepts of Line Follower
The concept of working of line follower is related to light. We use here the behavior of light at ablack and white surfaces. When light falls on a white surface it is almost fully reflected and in the case of ablack surface light is completely absorbed. This behavior of light is used in building a line follower robot.
In this Pi Pico-based line follower robot, we have used IR Transmitters and IR receivers also called photodiodes. They are used for sending and receiving light. IR transmits infrared lights. When infrared rays fall on a white surface, it’s reflected back and caught by photodiodes which generate some voltage changes. When IR light falls on a black surface, light is absorbed by the black surface and no rays are reflected back, thus photodiode does not receive any light or rays.
Here in this Pi Pico line follower robot when the sensor senses white surface then Pi Pico gets 1 as input and when senses black line Pi Pico gets 0 as input.”