Line Following Robot (LFR): The Complete Guide

A Line Following Robot (LFR) is a classic robotics project that every electronics enthusiast should build. It teaches you about sensors, motor control, and basic control algorithms.

The Core Principle

The robot uses Infrared (IR) Sensors to detect a black line on a white surface (or vice versa). Black absorbs IR light, while white reflects it. By reading the reflected light intensity, the robot knows if it's on the line.

Basic Components

• Arduino Uno or Nano
• IR Sensor Array (3 or 5 sensors)
• L298N or L293D Motor Driver
• BO Motors with Wheels
• Chassis
• Battery

Simple Logic

| Left Sensor | Center Sensor | Right Sensor | Action | | :--- | :--- | :--- | :--- | | White | Black | White | Move Forward | | Black | White | White | Turn Left | | White | White | Black | Turn Right | | Black | Black | Black | Stop (T-Junction or End) |

Leveling Up: PID Control

For smooth turns and high-speed tracking, implement a PID (Proportional-Integral-Derivative) controller. This advanced technique adjusts motor speeds dynamically based on the deviation from the line center.

Our Ready-to-Build Kit

Get started instantly with the Line Following Robot Using Arduino kit.