DIY Line Follower Buddy Robot Car is an engaging hands-on STEM robotics working model designed to help school kids and students explore the fundamentals of robotics, electronics, sensors, circuits, automation, and motion through practical learning. The robot uses an IR sensor system to detect and follow a black path, allowing students to visually understand how sensor-based robotic vehicles identify a track and respond to surface changes. The Line Follower Buddy Robot Car works on the black track and stops when it reaches the orange surface, providing a simple and easy-to-understand demonstration of IR sensing and automated movement. During operation, the red indicator lights glow, helping students observe the robot's working status while experimenting with the Orange–Black–Orange track. Designed for learning by doing, this DIY educational project introduces students to important STEM concepts including IR sensor technology, electronic circuits, motor control, robot movement, input/output connections, problem solving, and basic automation. Students can assemble, connect, test, and observe the robot, making theoretical science and electronics concepts more interactive and practical. Ideal for school science exhibitions, STEM activities, robotics projects, classroom demonstrations, science experiments, educational projects, and home learning, the Line Follower Buddy Robot Car encourages curiosity, logical thinking, creativity, and hands-on engineering skills. It is a useful educational kit for students who want to explore the exciting world of robotics and electronics through a working science model.