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);
  //Serial.println("Hello, ESP32!");
  pinMode(TRIG_PIN, OUTPUT);
  pinMode(ECHO_PIN,INPUT);
}

void loop() {
  distance = getDistanceInCentimeters();
  Serial.println("Distance="+String(distance));
  // put your main code here, to run repeatedly:
  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);
}