// BiGgY Handsome Ultrasonic

int trig = 6;
int echo = 4;
long duration = 0;
double cm = 0;
double inch = 0;
int led1 = 9;
int led2 = 11;
int led3 = 12;


void setup()
{
  pinMode(trig, OUTPUT);
  pinMode(echo, INPUT);
  pinMode(led1, OUTPUT);
  pinMode(led2, OUTPUT);
  pinMode(led3, OUTPUT);
  
}


void loop()
{
  //digitalWrite(trig, LOW);
  digitalWrite(trig, HIGH);
  digitalWrite(trig, LOW);
  
 
  duration = pulseIn(echo, HIGH);
  cm = duration*0.0344/2;
  inch = duration*0.01352/2;
  
Serial.begin(9600);
Serial.print("Duration  = ");
Serial.print(cm);
Serial.println("   Centimeter");
 
Serial.print("Duration  = ");
Serial.print(inch);
Serial.println("   Inch");
Serial.println();
  
  if(cm < 100)  
  {
    digitalWrite(led1, HIGH);
    delay(1000);
    digitalWrite(led1, LOW);
    delay(1000);
  }
  else if(cm >= 100 && cm <= 149) 
    {
     digitalWrite(led2, HIGH);
    delay(1000);
    digitalWrite(led2, LOW);
    delay(1000);
    } 
    else if(cm >= 150) 
    {
     digitalWrite(led3, HIGH);
    delay(1000);
    digitalWrite(led3, LOW);
    delay(1000);
    } 
    
    
}