Building Robots with Arduino UNO. : Line following robot.

Want to build a robot that thinks before it turns?
Discover how to create a fully functional robot that smoothly follows a light line on the ground using just an Arduino UNO and a clever optical sensor.

In this hands-on guide, you'll learn not just how to wire components, but how to program your robot to “see” the path and react in real-time. No more clunky movements—this robot glides with intelligence.

✅ Why is the TCRT5000 sensor perfect for line tracking?
✅ How does a state machine make your robot smarter and your code simpler?
✅ What’s the real difference between delay() and millis()—and why does it matter?

You’ll get clear diagrams, code listings, and full explanations that make this project ideal for robotics beginners, students, hobbyists, or competition participants.

By the end, you'll have built a robot that:

Sees and follows a path using contrast-based sensing

Makes decisions like a smart machine using state-based logic

Responds instantly to changes in its environment using non-blocking code

🎯 Ready to take your robotics skills to the next level?
Build your own line-following robot today—and get inspired to add more intelligent behaviors tomorrow.