Line-Follower Robot
This Grade 5-6 curriculum build connects a visible black-tape track to an autonomous steering decision. It is a planned learning project, not a claim of completed student work. The objective is to explain why the robot turns, rather than simply make it finish a track.
What the robot does
Two infrared sensors compare the surface beneath the rover. When one sensor sees the track and the other sees the surrounding surface, the controller changes motor speeds to steer back toward the line. Curves, junctions and a lost line make useful test cases: the robot needs a defined response, not a lucky run.
Suitable grade and components
The existing Grades 5-6 pathway, approximately ages 10-11, introduces Arduino Nano or Uno, a solderless breadboard, an L298N motor driver and sensor shields. The line-following build uses infrared line sensors and a motorized chassis. The mentor selects the kit configuration; components are not a shopping list parents need to buy before a demo.
Programming and testing
Students begin by reading each sensor over both surfaces and recording the difference. They choose thresholds, then test straight movement before adding turns. Conditions select a steering action, loops repeat the sensing cycle, and PWM adjusts motor speed. Arduino C++ is used for the controller; Python foundations belong to the wider grade pathway.
A useful test changes one variable at a time: track width, curve sharpness, lighting or speed. If the rover leaves the track, students distinguish a sensing problem from a steering problem. Faster is not automatically better; repeatable control is the learning goal.
Learning outcome and next steps
A learner should be able to show sensor readings, explain a threshold and demonstrate how a motor adjustment changes the path. An extension is to decide what the robot should do when both sensors lose the line. Students who can explain these cases are better prepared for connected sensor projects in Grades 7-8. Project photos and videos will be added only after genuine builds are available.