int trig=13;
int echo=14;
long distance,duration;
void setup() {
  // put your setup code here, to run once:
  Serial.begin(11520);
  pinMode(trig, OUTPUT);
  pinMode(echo, INPUT);
  Serial.println("Hello, ESP32!");
}

void loop() {
  digitalWrite(trig, LOW);
  delayMicroseconds(10);
  digitalWrite(trig, HIGH);
  delayMicroseconds(10);
  digitalWrite(trig, LOW);
  duration = pulseIn(echo,HIGH);
  distance=(duration*0.34)/10;
  Serial.println(distance);
  delay(3000);
  delay(10); 
}