Robotics Line Follower — Free Robotics Tutorial
Learn Robotics Line Follower in Robotics with a free, beginner-friendly tutorial, examples and practice for Indian students on Syllab.in.
TL;DR: Learn Robotics Line Follower in Robotics with a free, beginner-friendly tutorial, examples and practice for Indian students on Syllab.in.
Written & reviewed by the Syllab.in Academic Team (CBSE/NCERT subject experts) · Updated
Robotics Line Follower in Robotics
A line-following robot detects a black line (dark) on white background (or vice versa) using IR sensors. Typical setup: 2–3 IR sensors under the robot.
Logic: if middle sensor sees line, go straight. If left sensor sees line, turn left. If right sensor sees line, turn right. Speed-based turning offers smoother control.
Proportional control: turn speed proportional to error from line. Example: far left = maximum left turn; slightly left = gentle left turn.
Robotics Line Follower — Syntax
// Line follower: 3-sensor setup
const int leftSensor = A0;
const int midSensor = A1;
const int rightSensor = A2;
int threshold = 500;
void loop() {
int left = analogRead(leftSensor) > threshold;
int mid = analogRead(midSensor) > threshold;
int right = analogRead(rightSensor) > threshold;
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