const int trigPin = 11;
    const int echoPin = 12;
    const int ledPin = 2;
    long duration;
 int distance;
 
void setup ()
{
  pinMode(trigPin, OUTPUT);
  pinMode(echoPin, INPUT);
  pinMode(ledPin, OUTPUT);
  Serial.begin(9600);
}
 
void loop ()
{
  digitalWrite(trigPin, LOW);
  delayMicroseconds(2);
  digitalWrite(trigPin,HIGH );
  delayMicroseconds(10);
 
  duration = pulseIn(echoPin, HIGH);
 
  distance =duration*0.034/2;
 
  if (distance < 59)
 digitalWrite(ledPin, LOW);
  else digitalWrite(ledPin, HIGH);
 
 
      delay (500);
  Serial.println(distance);
}