const int trigPin=12;
const int echoPin=27;
void setup(){
  Serial.begin(115200);
  pinMode(trigPin, OUTPUT);
  pinMode(echoPin, INPUT);
}

void loop() {
digitalWrite( trigPin, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigPin, LOW);
  int duration =pulseIn(echoPin,HIGH);
  int distance =duration *0.034/2;
  Serial.println(distance );

}