const int trigPin=11;
const int ecoPin=10;
long duration;
long distanceInCm,distanceInInches;

void setup() {
  pinMode(11, OUTPUT);
  pinMode(10, INPUT);
  pinMode(5, OUTPUT);
}

void loop() {
  digitalWrite(11, LOW);
  delayMicroseconds(2);
  digitalWrite(11, HIGH);
  delayMicroseconds(10);
  digitalWrite(11, LOW);

  duration=pulseIn(10,HIGH);
  distanceInCm=duration * 0.034/2;
  distanceInInches=duration * 0.0133/2;
  digitalWrite(5, HIGH);
  delay(distanceInCm);
  digitalWrite(5, LOW);
  delay(distanceInCm);
  }