#define trig_Pin 8
#define echo_Pin 9
long mesafe =0;
long sure = 0;
void setup()
{
  for ( int i=2; i<7; i++)
  {
    pinMode(i,OUTPUT);
  }
  pinMode(trig_Pin,OUTPUT);
  pinMode(echo_Pin,INPUT);
  Serial.begin(9600);
  
}
void loop()
{
  digitalWrite(trig_Pin,HIGH);
  delayMicroseconds(1000);
  digitalWrite(trig_Pin,LOW);
  sure= pulseIn (echo_Pin,HIGH);
  mesafe=(sure/29.1)/2;
  if (mesafe>300)
  mesafe=300;
  Serial.print("Olculen Mesafe =");
  Serial.print(mesafe);
  Serial.print ("cm");
  delay(100);
  if(mesafe>0&&mesafe<=10)
  {
    digitalWrite(2,HIGH);
    digitalWrite(3,LOW);
    digitalWrite(4,LOW);
    digitalWrite(5,LOW);
    digitalWrite(6,LOW);
  }
  else if(mesafe> 10&&mesafe<=20)
  {
    digitalWrite(2,HIGH);
    digitalWrite(3,HIGH);
    digitalWrite(4,LOW);
    digitalWrite(5,LOW);
    digitalWrite(6,LOW);
  }
  else if (mesafe>20&&mesafe<=30)
  {
    digitalWrite(2,HIGH);
    digitalWrite(3,HIGH);
    digitalWrite(4,HIGH);
    digitalWrite(5,LOW);
    digitalWrite(6,LOW);

   
  }
  else if(mesafe>30&&mesafe<=40)
  {
    digitalWrite(2,HIGH);
    digitalWrite(3,HIGH);
    digitalWrite(4,HIGH);
    digitalWrite(5,HIGH);
    digitalWrite(6,LOW);
  }
  
  else 
  {
    digitalWrite(2,HIGH);
    digitalWrite(3,HIGH);
    digitalWrite(4,HIGH);
    digitalWrite(5,HIGH);
    digitalWrite(6,HIGH);
  }
}