long duration;
int distance;
void setup(){
  pinMode(12,OUTPUT);
  pinMode(14, INPUT);
  Serial.begin(9600);
}
void loop(){
  digitalWrite(12,LOW);
  delayMicroseconds(2);
  digitalWrite(12,HIGH);
  delayMicroseconds(10);
  digitalWrite(12, LOW);
  duration = pulseIn(14,HIGH);
  distance = duration * 0.034/2;
  Serial.print("Distance=");
  Serial.println(distance);
  delay(500);