float duration, distance;

void setup() {
  pinMode(12, OUTPUT);
  pinMode(11, INPUT);
  Serial.begin(9600);
  // put your setup code here, to run once:

}

void loop() {
  digitalWrite(12, LOW);
  delayMicroseconds(2);
  digitalWrite(12, HIGH);
  delayMicroseconds(10);
  digitalWrite(12, LOW);

  duration = pulseIn(11, HIGH);
  distance = (duration*.0343)/2;
  Serial.print("Distance: ");
  Serial.println(distance);
  delay(100);  
  // put your main code here, to run repeatedly:

}