It has 14 digital I/O pins( 6 pins can be used as PWM pins).
To support the microcontroller, it uses the components such as crystal oscillator, serial communication, voltage regulator, etc. When IR rays fall on a black surface, it is absorbed by the black surface, and no rays are reflected thus, the IR receiver doesn’t receive any rays.Īrduino Uno is an 8-bit ATmega328P microcontroller. When IR rays fall on a white surface, it is reflected towards IR receiver, generating some voltage changes. They are used to send and receive the lights. In this line follower robot, we use IR transmitters and receivers (photodiodes). The white colour reflects all the light that falls on it, whereas the black colour absorbs the light. Here, we use the behaviour of light on the black and white surface. The concept of the line follower robot is related to light.