void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200);
  pinMode(14, OUTPUT);
  pinMode(27, INPUT);
}

void loop() {
  digitalWrite(14, HIGH);
  delay(100);
  digitalWrite(14, LOW);
  float duration=pulseIn(27,HIGH);
  int distance=duration*0.034/2;
  Serial .println(distance);
}