// Define the pins for the ultrasonic sensor
const int trigPin = 7;
const int echoPin = 6;

// Variable to store the duration of the sound wave travel
long duration;

// Variable to store the distance measured
int distance;

void setup() {
  // Initialize the serial communication
  Serial.begin(9600);

  // Set the trigPin as OUTPUT
  pinMode(trigPin, OUTPUT);
  
  // Set the echoPin as INPUT
  pinMode(echoPin, INPUT);
}

void loop() {
  // Clear the trigPin by setting it LOW
  digitalWrite(trigPin, LOW);
  delayMicroseconds(2);

  // Set the trigPin HIGH for 10 microseconds
  digitalWrite(trigPin, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigPin, LOW);

  // Read the echoPin, which returns the time in microseconds
  duration = pulseIn(echoPin, HIGH);

  // Calculate the distance in centimeters
  distance = duration * 0.034 / 2;

  // Print the distance on the serial monitor
  Serial.print("Distance: ");
  Serial.print(distance);
  Serial.println(" cm");

  // Wait for 100 milliseconds before the next measurement
  delay(100);
}