#define TRIG_PIN 9
#define ECHO_PIN 10

void setup() {
  pinMode(TRIG_PIN, OUTPUT);
  pinMode(ECHO_PIN, INPUT);
  Serial.begin(9600);
}

void loop() {
  long duration, distance;
  
  // Send a pulse to trigger
  digitalWrite(TRIG_PIN, LOW);
  delayMicroseconds(2);
  digitalWrite(TRIG_PIN, HIGH);
  delayMicroseconds(10);
  digitalWrite(TRIG_PIN, LOW);
  
  // Read the echo pulse duration
  duration = pulseIn(ECHO_PIN, HIGH);
  
  // Calculate distance in centimeters
  distance = (duration / 2) * 0.0344;
  
  // Print the distance
  Serial.print("Distance: ");
  Serial.print(distance);
  Serial.println(" cm");
  
  delay(500); // Wait for 0.5 seconds
}