IR-Sensor Line Follow Robot

BLOCK Diagram For Whole Project:
Simple Bloack Diagram of Our Line Follow Robot

IR Sensor Circuit Diagram

Bread Board :

Read This For Understand The Sensor Circuit .
https://circuitdigest.com/electronic-circuits/ir-sensor-circuit-diagram

Same Circuit in PCB (Our Goal).

Bottom of this Link You can Find The same Circuit in PCB .
http://maxembedded.com/2013/08/how-to-build-an-ir-sensor/


OR

You Can Buy It Ready mate for this link in bangladesh .
We Need 3 Unit of this sensor

http://bdspeedytech.com/index.php?route=product/product&product_id=238

Code and Connection to Ardiuno 

Sensor In Car Module :
connect the sensor bottom of the car .

Sensor and Arduno: sensor connection with ardiuno .

Code

	/*created by Mostafa Zaghloul with a helper library called RedBot.h you can find
	* it on this link https://github.com/sparkfun/RedBot
	*--------------------------- thanks a million ---------------------------------
	*you can find me on
	*FaceBook::https://www.facebook.com/mostafa.zaghlol3
	*Twitter::https://twitter.com/Mostafazaghlul
	*to Contact for hardware or software questions
	*/
	#include <RedBot.h>
	RedBotSensor left_sen = RedBotSensor(A3);
	RedBotSensor center_sen = RedBotSensor(A4);
	RedBotSensor right_sen = RedBotSensor(A5);
	//data_sheet
	// constants that are used in the code. lineStandard is the level to detect
	// if the sensor is on the line or not. If the sensor value is greater than this
	// the sensor is above a DARK line.
	//
	// SPEED sets the nominal speed
	//motor A
	#define en1 9
	#define in1 4
	#define in2 5
	//motor b
	#define en2 3
	#define in3 6
	#define in4 7
	int lineStandard = 800;
	void setup()
	{ pinMode(in1, OUTPUT);
	pinMode(in2, OUTPUT);
	pinMode(in3, OUTPUT);
	pinMode(in4, OUTPUT);
	pinMode(en1, OUTPUT);
	pinMode(en2, OUTPUT);
	Serial.begin(9600);
	Serial.println("IR Sensor Readings:: ");
	delay(1000);
	}
	void loop()
	{
	Serial.print(left_sen.read());
	Serial.print("\t");
	Serial.print(center_sen.read());
	Serial.print("\t");
	Serial.print(right_sen.read());
	Serial.println();
	//data_sheet
	// if on the line drive left and right at the same speed (left is CCW / right is CW)
	if(center_sen.read() > lineStandard)
	{//right
	right();
	}
	//data_sheet
	// if the line is under the right sensor, adjust relative speeds to turn to the right
	else if(right_sen.read() > lineStandard)
	{//left
	left();
	}
	//data_sheet
	// if the line is under the left sensor, adjust relative speeds to turn to the left
	else if(left_sen.read() > lineStandard)
	{//right
	right();
	}
	//data_sheet
	// if all sensors are on black or up in the air, stop the motors.
	// otherwise, run motors given the control speeds above.
	if((left_sen.read() > lineStandard) && (center_sen.read() > lineStandard) && (right_sen.read() > lineStandard) )
	{
	//stop
	Stop ();
	}
	else
	{
	//any dir
	forward();
	}
	delay(0); // add a delay to decrease sensitivity.
	}
	void right() {
	analogWrite(en1,255);
	analogWrite(en2,255);
	digitalWrite(in1, LOW);
	digitalWrite(in2, LOW);
	digitalWrite(in3, HIGH);
	digitalWrite(in4, LOW);
	}
	void Stop () {
	analogWrite(en1, 0);
	analogWrite(en2, 0);
	digitalWrite(in1, LOW);
	digitalWrite(in2, LOW);
	digitalWrite(in3, LOW);
	digitalWrite(in4, LOW);
	}
	void left() {
	analogWrite(en1, 255);
	analogWrite(en2, 255);
	digitalWrite(in1, HIGH);
	digitalWrite(in2, LOW);
	digitalWrite(in3, LOW);
	digitalWrite(in4, LOW);
	}
	void forward() {
	analogWrite(en1, 255);
	analogWrite(en2, 255);
	digitalWrite(in1, HIGH);
	digitalWrite(in2, LOW);
	digitalWrite(in3, HIGH);
	digitalWrite(in4, LOW);
	}
	void back(){
	analogWrite(en1, 255);
	analogWrite(en2, 255);
	digitalWrite(in1, LOW);
	digitalWrite(in2,HIGH);
	digitalWrite(in3, LOW);
	digitalWrite(in4, HIGH);
	}

view raw IR_LineFollowCode.ino hosted with ❤ by GitHub

Code Link :(Read this Link Very Care Fully )
https://create.arduino.cc/projecthub/16336/line-follower-robot-using-arduino-5f5698

Wright Down the Component make a list which you need to buy and Test the IR Circuit First .