#define TRIG_PIN 9
#define ECHO_PIN 10

long duration;
int distance;

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

void loop() {
  digitalWrite(TRIG_PIN, LOW);  
  delayMicroseconds(2);
  digitalWrite(TRIG_PIN, HIGH);  
  delayMicroseconds(10);
  digitalWrite(TRIG_PIN, LOW);

  
  duration = pulseIn(ECHO_PIN, HIGH);

 
  distance = duration * 0.0344 / 2;  

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

  delay(500);  //
}