• 👋 Hi, I’m @Akash7037

Line Following IOT

A line-following robot is an autonomous machine that can follow a predefined path, typically marked by a black or white line on the ground. Using an Arduino Uno and 2 IR (infrared) sensors, you can build a simple and effective line-following robot.

Components

• Arduino Uno
• 2 Ir sensor (obstacles avoid sensor)
• Driver module (L298N)
• 2 Dc motors
• Chasis
• Batteries

Connection

IR sensor

• Ir gnd = Arudino gnd
• Ir vcc = arudino 5v
• Ir out (left) = Arudino 2
• Ir out (right) = Arduino 3

Driver Module

• In1 = d 4
• In2 = d 5
• In4 = d 6
• In5 = d 7
• ENA = 9
• ENB = 10
• 12v or 5v = battery +ve
• gnd = -ve of battery
• Out 1,2 = motor left
• Out 3,4 = Motor right

  CoDE

  #define leftSensor 2     // Left IR sensor
   #define rightSensor 3    // Right IR sensor
  #define leftMotor1 4     // IN1 on motor driver (Left Motor)
  #define leftMotor2 5     // IN2 on motor driver (Left Motor)
  #define rightMotor1 6    // IN3 on motor driver (Right Motor)
  #define rightMotor2 7    // IN4 on motor driver (Right Motor)
  #define enA 9            // ENA pin for speed control (Left Motor)
  #define enB 10           // ENB pin for speed control (Right Motor)
  int motorSpeed = 150;
  
  void setup() {
  pinMode(leftSensor, INPUT);
  pinMode(rightSensor, INPUT);
  pinMode(leftMotor1, OUTPUT);
  pinMode(leftMotor2, OUTPUT);
  pinMode(rightMotor1, OUTPUT);
  pinMode(rightMotor2, OUTPUT);
  pinMode(enA, OUTPUT);
  pinMode(enB, OUTPUT);
  
  // Set initial speed
  analogWrite(enA, motorSpeed);
  analogWrite(enB, motorSpeed);
  }
  
  void loop() {
  int left = digitalRead(leftSensor);
  int right = digitalRead(rightSensor);
  
  if (left == LOW && right == LOW) { // Both sensors on the line
    moveForward();
  } else if (left == HIGH && right == LOW) { // Left sensor off the line
    turnRight();
  } else if (left == LOW && right == HIGH) { // Right sensor off the line
    turnLeft();
  } else { // Both sensors off the line
    stopMotors();
  }
  }
  
  // Function to move forward
  void moveForward() {
  digitalWrite(leftMotor1, HIGH);
  digitalWrite(leftMotor2, LOW);
  digitalWrite(rightMotor1, HIGH);
  digitalWrite(rightMotor2, LOW);
  }
  
  // Function to turn left
  void turnLeft() {
  digitalWrite(leftMotor1, LOW);
  digitalWrite(leftMotor2, HIGH);
  digitalWrite(rightMotor1, HIGH);
  digitalWrite(rightMotor2, LOW);
  }
  
  // Function to turn right
  void turnRight() {
  digitalWrite(leftMotor1, HIGH);
  digitalWrite(leftMotor2, LOW);
  digitalWrite(rightMotor1, LOW);
  digitalWrite(rightMotor2, HIGH);
  }
  
   // Function to stop motors
  void stopMotors() {
  digitalWrite(leftMotor1, LOW);
  digitalWrite(leftMotor2, LOW);
  digitalWrite(rightMotor1, LOW);
  digitalWrite(rightMotor2, LOW);
  }