const int trigPin = 9;
const int echoPin = 10;
const int buzzerPin = 11;
const int ledPin = 12;

void setup() {
  pinMode(trigPin, OUTPUT);
  pinMode(echoPin, INPUT);
  pinMode(buzzerPin, OUTPUT);
  pinMode(ledPin, OUTPUT);
  
  Serial.begin(9600); // For debugging purposes
}

void loop() {
  // Clear the trigger pin before sending the signal
  digitalWrite(trigPin, LOW);
  delayMicroseconds(2);

  // Send a 10 microsecond pulse to the trigger pin
  digitalWrite(trigPin, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigPin, LOW);

  // Read the echo pulse duration and calculate the distance
  long duration = pulseIn(echoPin, HIGH);
  float distance = duration * 0.034 / 2;

  // Debugging
  Serial.print("Distance: ");
  Serial.print(distance);
  Serial.println(" cm");

  // Check if the distance is less than 100cm
  if (distance < 100) {
    digitalWrite(buzzerPin, HIGH);
    digitalWrite(ledPin, HIGH);
    Serial.print(" the object is identified");
  } else {
    digitalWrite(buzzerPin, LOW);
    digitalWrite(ledPin, LOW);
    Serial.print(" the object is far away");

  }

  delay(100); // Wait a bit before doing the next measurement
}