const int trigger = 7;
  const int echo =6;


  float duration, distance;




void setup() {
  // put your setup code here, to run once:
  
  
  
  
  pinMode(trigger, OUTPUT);
  pinMode(echo, INPUT);


  pinMode(8, OUTPUT);
  pinMode(9, OUTPUT);
  pinMode(10, OUTPUT);
}

void loop() {
  // put your main code here, to run repeatedly:


  digitalWrite(trigger, LOW);  
	delayMicroseconds(2);  
	digitalWrite(trigger, HIGH);  
	delayMicroseconds(10);  
	digitalWrite(trigger, LOW);  


  duration = pulseIn(echo, HIGH); 
  distance = (duration*.0343)/2;


 
  delay(100);


  if (distance <=100)
  {

    digitalWrite(8, HIGH);
  }
   else{

      digitalWrite(8, LOW);
    }

  if (distance >100  && distance <=200)
  {

    digitalWrite(9, HIGH);
  }
   else{

      digitalWrite(9, LOW);
    }


if (distance >200  && distance <=1000)
  {

    digitalWrite(10, HIGH);
  }
  
    else{

      digitalWrite(10, LOW);
    }
    
  









  

}