int duration;
long distance;

void setup() {
  // put your setup code here, to run once:
  pinMode(13,OUTPUT);
  pinMode(12,INPUT);
  Serial.begin(9600);
}

void loop() {
  // Initiating Trigger signal
  digitalWrite(13,LOW);
  delayMicroseconds(2);
  digitalWrite(13,HIGH);
  delayMicroseconds(10);
  digitalWrite(13,LOW);

  duration = pulseIn(12,HIGH);
  duration = duration/2;
  distance = 0.034 * duration;
  Serial.print("Distance - ");
  Serial.print(distance);
  delay(1000);
  Serial.print("\n");
}