How to use the Line Tracking Sensor with Arduino

INTRODUCTION

This sensor can be used for line tracking purposes. It differentiates white and black colors and it outputs via a digital signal. Utilizing it enables your mobile robot to have intelligent line following functions, or anti-collision, or anti-edge falling. Good performance can be found if the object has a reflective surface.

APPLICATIONS

Its applications include line following robots, delivery or warehouse robots and also food serving robots in a restaurant.

WIRING DIAGRAM

VCC – 5V

GND - GND

Out – Digital Pin 8

You will need a sheet of white paper and a black sharpie to test the sensor. Go ahead an draw a line on the whitepaper.

CODE

const int tracingPin = 8;

const int ledPin = 13;

void setup()
{
pinMode(tracingPin, INPUT);
pinMode(ledPin, OUTPUT);
}

void loop()
{
int val = digitalRead(tracingPin);
if(val == HIGH)
{ 
digitalWrite(ledPin, HIGH);
}
else
{
digitalWrite(ledPin, LOW);
}
}

END RESULT

LED pin on the Arduino board will light up when the sensor is detecting black color on a white background.

ADDITIONAL RESOURCES

http://arduinolearning.com/code/ir-line-tracking-sensor-example.php