// Define pins for ultrasonic sensor
const int trigPin = 9; // Trigger pin
const int echoPin = 10; // Echo pin
int buzzerpin = 8;

// Variables for duration and distance
long duration;
int distance;

void setup() {
  // Initialize serial communication
  Serial.begin(9600);
  
  // Set trigPin as an output and echoPin as an input
  pinMode(trigPin, OUTPUT);
  pinMode(echoPin, INPUT);
  pinMode(buzzerpin, OUTPUT);
}

void loop() {
  // Clear the trigPin
  digitalWrite(trigPin, LOW);
  delayMicroseconds(2);
  
  // Send a 10 microsecond pulse to trigger the sensor
  digitalWrite(trigPin, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigPin, LOW);
  digitalWrite(buzzerpin, HIGH);
  
  // Measure the duration of the pulse on the echoPin
  duration = pulseIn(echoPin, HIGH);
  
  // Calculate distance in centimeters
  distance = duration * (0.034 / 2);
  
  // Print the distance to the serial monitor
  Serial.print("Distance from the obstacle: ");
  Serial.print(distance);
  Serial.println(" cm");
  
  // Wait before taking another reading
  delay(500);
}