// Define pin numbers
const int trigPin = 3;  // Trigger pin connected to Pin 9
const int echoPin = 2; // Echo pin connected to Pin 10
long duration;          // Variable to store the echo duration
float distance;         // Variable to store the calculated distance

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

  // Set the trigPin as an output
  pinMode(trigPin, OUTPUT);

  // Set the echoPin as an input
  pinMode(echoPin, INPUT);
}

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

  // Trigger the sensor by setting the trigPin high for 10 microseconds
  digitalWrite(trigPin, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigPin, LOW);

  // Read the echoPin, return the duration in microseconds
  duration = pulseIn(echoPin, HIGH);

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

  // Print the distance to the Serial Monitor
  Serial.print("Distance: ");
  Serial.print(distance);
  Serial.println(" cm");

  // Small delay before next reading
  delay(500);
}