const int TRIG_PIN=2;
const int ECHO_PIN=4;
long duration,distance;
void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200);
  pinMode(TRIG_PIN, OUTPUT);
  pinMode(ECHO_PIN, INPUT);
}

void loop() {
  // put your main code here, to run repeatedly:
  distance=getDistanceInCentimeters();
  Serial.println("Distance="+String(distance));
  delay(1000); // this speeds up the simulation
}
long getDistanceInCentimeters(){
  digitalWrite(TRIG_PIN, LOW);
  delayMicroseconds(2);
  digitalWrite(TRIG_PIN, HIGH);
  delayMicroseconds(10);
  digitalWrite(TRIG_PIN, LOW);
  duration=pulseIn(ECHO_PIN,HIGH);
  return(duration*0.034/2)+1;
}