Project hurrican

int trig = 9;
int echo = 10;
int b = 6;
void setup()
{
 pinMode (trig,OUTPUT); 
 pinMode (echo,INPUT); 
 pinMode (b,OUTPUT); 
}
void loop()
{
  digitalWrite (trig,LOW);
 delayMicroseconds (2);
  
  digitalWrite (trig,HIGH);
  delayMicroseconds (10);
  
  digitalWrite (trig,LOW);
  delayMicroseconds (2);
  
  int duration = pulseIn (echo,HIGH);
  int distance = duration*0.034/2;
  Serial.println (distance);
  if (distance<=182)
  
  {
    delay (500);
    digitalWrite (b,HIGH); 
  }
    else 
  {
    digitalWrite (b,LOW); 
  }
}