int trig=12;
int echo=7;
float dist;
long time;



void setup() {
  // put your setup code here, to run once:
  pinMode(trig, OUTPUT);
  pinMode(6, OUTPUT);


pinMode(5, OUTPUT);
pinMode(2, OUTPUT);
pinMode(3, OUTPUT);
pinMode(4, OUTPUT);

  pinMode(echo, INPUT);
  Serial.begin(9600);

}

void loop() {

  delay(300);
  // put your main code here, to run repeatedly:
  digitalWrite(trig,LOW);
  delayMicroseconds(2);
  digitalWrite(trig, HIGH);
  delayMicroseconds(10);
  digitalWrite(trig, LOW);
  time=pulseIn(echo,HIGH);

  dist=time*0.034/2;
  Serial.println(dist);

  if(dist >= 11){
    digitalWrite(6, HIGH);
   
  }
  

/*

////////////////////////////////buzzer


    if(dist >= 11){
   tone(13, 262, 250);
  
   
  }



  if(dist<=3){
    digitalWrite(6, LOW); 

  }


*/


   
  

  if(dist<=3){
    digitalWrite(6, LOW);

  }

  ///////////////////////////////////////////////////////// led part

if (dist >= 3 && dist < 6.75) {
    digitalWrite(5, HIGH);
    digitalWrite(2, HIGH);
    digitalWrite(3, HIGH);
    digitalWrite(4, HIGH);
}

if (dist >= 6.75 && dist < 10.5) {
    digitalWrite(5, LOW);
    digitalWrite(2, HIGH);
    digitalWrite(3, HIGH);
    digitalWrite(4, HIGH);
}

if (dist >= 10.5 && dist < 14.25) {
    digitalWrite(5, LOW);
    digitalWrite(2, LOW);
    digitalWrite(3, HIGH);
    digitalWrite(4, HIGH);
}

if (dist >= 14.25 && dist < 18) {
    digitalWrite(5, LOW);
    digitalWrite(2, LOW);
    digitalWrite(3, LOW);
    digitalWrite(4, HIGH);
}



}