Line Tracing Robot Using Arduino

Abstract

The Line Tracing Robot using Arduino Uno is an autonomous robotic system designed to detect and follow a predefined path, usually represented by a black line on a white surface. The robot uses infrared (IR) sensors to sense the contrast between the line and the background by measuring reflected light. These sensor signals are continuously sent to the Arduino Uno microcontroller, which processes the data and acts as the control unit of the system.Based on the sensor inputs, the Arduino generates appropriate control signals for the motor driver circuit, which drives the DC motors. The speed and direction of the motors are adjusted in real time to ensure that the robot remains aligned with the path and makes corrective movements whenever it deviates. This feedback-based operation makes the system a closed-loop control system.This project demonstrates the effective integration of hardware and software components in embedded systems and robotics. It helps in understanding key concepts such as sensor interfacing, motor control, control algorithms, and real-time decision making. Due to its simplicity, low cost, and reliable performance, the Line Tracing Robot is widely used as a learning platform and has practical applications in industrial automation, warehouse navigation, and autonomous robotic systems.

Introduction

The text explains the concept, design, and working of a Line Tracing (Line Follower) Robot, a fundamental application in robotics used for autonomous navigation along a predefined path. The robot uses infrared (IR) sensors to detect contrast between a black line and a white surface. These sensors send signals to an Arduino Uno microcontroller, which processes the data and controls DC motors via a motor driver to maintain alignment with the path using a feedback control system.

The literature review highlights the evolution of line tracing robots from basic sensors like LDRs to more advanced IR-based systems. Modern implementations commonly use microcontrollers such as Arduino, along with control algorithms like on-off logic and PID control for improved accuracy, especially on curves. These robots are widely used in industrial applications like automated guided vehicles (AGVs) and serve as an effective educational platform for learning embedded systems and automation.

The problem statement emphasizes the need for an efficient, low-cost, and autonomous system to replace manual material transportation in industries. The project aims to design a robot that can reliably follow a path in real time using sensor feedback.

The system components include Arduino Uno, IR sensors, motor drivers (L298N/L293D), DC motors, chassis, and power supply.

The working principle involves:

• Detecting the line using IR sensors,

• Processing signals in the Arduino,

• Making decisions using control algorithms,

• Adjusting motor speed and direction through the motor driver,

• Continuously correcting movement via a closed-loop feedback system.

Conclusion

The line tracing robot using Arduino is a remarkable project that demonstrates the potential of robotics and automation. By leveraging Infrared sensor sand Arduino microcontrollers, this robot can accurately follow a predetermined path, showcasing autonomous navigation capabilities. This project has significant implications for industries, education, and research. Line tracing robots can improve efficiency and productivity in various sectors, such as manufacturing, logistics, and warehousing. They can also provide a valuable learning tool for students, teaching them about robotics, programming, and automation. The line tracing robot\'s ability to navigate autonomously makes it an attractive solution for various applications. It can be used for material handling, inventory management, and quality control, reducing the need for human intervention and improving overall efficiency. In conclusion, the line tracing robot using Arduino is an innovative project that highlights the possibilities of robotics and automation. With its potential applications and educational value, this project is an exciting development in the field of robotics and automation, paving the way for future advancements and innovations.

References

[1] Arduino Official Documentation [2] Robotics Tutorials [3] Embedded Systems Notes

Copyright

Copyright © 2026 Prof. M.T. Dangat, Divya Kothawle, Anshul Kalbhor, Pranav Shah, Laksh Choudhary. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.