void setup() {
  // put your setup code here, to run once:
Serial.begin(9600);
pinMode(9, OUTPUT);
pinMode(5, INPUT);
}

void loop() {
  // put your main code here, to run repeatedly:
digitalWrite(9, LOW);
delay(100);
digitalWrite(9, HIGH);
delay(1000);
digitalWrite(9, LOW);
int time=pulseIn(5, HIGH);
int distance=time*0.0346/2;
Serial.println(distance);
}