int echoPin = 8;
int trigPin = 9;

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

}

void loop() {
  // put your main code here, to run repeatedly:
  digitalWrite(trigPin, LOW);
  delayMicroseconds(2);
  digitalWrite(trigPin, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigPin, LOW);

  double duration = pulseIn(echoPin, HIGH);
  double distance = (duration * 0.0343)/2;

  Serial.print("Distance: ");
  Serial.println(distance);
  delay(500);
}