LINE FOLLOWER ROBOT - THE EASIEST!

This is a simple tutorial to make a line follower robot using Arduino. I am using the same robot platform of my previous tutorial ?"Make your first Arduino robot"In this tutorial, You can follow the tutorial to make the platform of this robot.

Parts needed

Arduino

Materials-

IR sensors - Buy here (Amzon.in, Amazon.com)

Arduino uno - Buy here

L293D motor shield - Buy here 

2 x Gear motor - Buy here

2 x Wheel - Buy here

Caster wheel - Buy here

3 x 9 volt battery

3 x battery clip - Buy here

DC male jack - Buy here

8 x Female to female jumper wire - Buy here

Plastic box (size - 14 cm x 10 cm)

Tools

Screw driver

Soldering iron

Hot glue gun

Driller

Step 1: Making changes from the previous robot

Connecting the IR sensors

If you are a beginner visit my previous tutorial for complete information and follow steps 1 to 4.

After making the chassis. Connect the IR sensors as shown in the image. The position of IR LEDs and receivers is 0.5 cm from the ground.

Step 2: Circuit diagram and sensor connection

Wiring Instructions

Connect the left sensor 'out' to the digital 'pin 8' of Arduino

Connect the right sensor 'out' to the digital 'pin 9' of Arduino

Connect the 'VCC' of both sensors to '5 volts' of Arduino

Connect the 'gnd' of both sensors to 'gnd' of Arduino

Connect two header mail pins to pins 8 and 9 of motor shield.

Take out the wires through the hole.

Connect the wires to the sensors.

Everything is completed.

Step 3: Code for the Arduino

Install the 'AFmotor' library before compiling the program (Copy paste the AFmotor folder to to arduino libraries folder) Click here to download it.

/*

Author: Muhammed Azhar

visit - robotechmaker.com

*/

#include "AFMotor.h";

int IRleft = 8; // the input of IR sensor right

int IRright = 9; // the input of IR sensor left

//Objects

AF_DCMotor motorRight(1, MOTOR12_64KHZ); // create motor #1, 64KHz pwm

AF_DCMotor motorLeft(3, MOTOR12_64KHZ); // create motor #3, 64KHz pwm

void setup() {

Serial.begin(9600); // set up Serial library at 9600 bps

pinMode(IRright, INPUT); // sets the digital pin 9 as input

pinMode(IRleft, INPUT); // sets the digital pin 8 as input

//Initalization messages

Serial.println("ARDUINO LINE FOLLOWER");

Serial.println(" Reday for working!");

//turn off motors

motorRight.setSpeed(0);

motorLeft.setSpeed(0);

motorRight.run(RELEASE);

motorLeft.run(RELEASE);

}

void loop() {

//for wall follower robot.

motorRight.setSpeed(255); //set the speed of the motors, between 0-255

motorLeft.setSpeed (255);

if (digitalRead(IRright) == LOW)

{

Serial.println ("right Line is ditected!" );

motorRight.setSpeed(255);

motorLeft.setSpeed(80);

motorRight.run(FORWARD);

motorLeft.run(FORWARD);

delay(500); // wait for a second

}

if (digitalRead(IRleft) == LOW)

{

Serial.println ("left Line is ditected!" );

motorRight.setSpeed(80);

motorLeft.setSpeed(255);

motorRight.run(FORWARD);

motorLeft.run(FORWARD);

delay(500); // wait for a second

}

else {

{

Serial.println ("Placed in ground. No line ditected. Going forward");

delay (15);

motorRight.setSpeed(255);

motorLeft.setSpeed(255);

motorRight.run(FORWARD);

motorLeft.run(FORWARD);

}

}}

"If you have any doubts or any suggestions please comment below"