float VR = A2;
float  Volt_IN;
float  Volt;

int LED_R = 13;
int LED_Y = 12;
int LED_G = 11;

void setup()
{
  Serial.begin(9600);
  pinMode(VR, INPUT);
  
  pinMode(LED_R,OUTPUT);
  pinMode(LED_Y,OUTPUT);
  pinMode(LED_G,OUTPUT);
}

void loop()
{
  Volt_IN = analogRead(A2);
  Volt = Volt_IN * 0.00489;
  Serial.println(Volt);
  
  if(Volt >= 0 && Volt <= 1){
      digitalWrite(LED_R, HIGH); 
      digitalWrite(LED_G, HIGH); 
      digitalWrite(LED_Y, HIGH);
    }
    else if(Volt >= 1 && Volt <= 2){
      digitalWrite(LED_Y, HIGH); 
      digitalWrite(LED_R,HIGH); 
      digitalWrite(LED_G, LOW); 
      
    }
    else if(Volt >= 2 && Volt <= 3){
      digitalWrite(LED_R,HIGH);
      digitalWrite(LED_Y, LOW);
      digitalWrite(LED_G, HIGH);
     
    }
    else if(Volt >= 3 && Volt <= 9){
      digitalWrite(LED_R, LOW);
      digitalWrite(LED_Y, HIGH);
      digitalWrite(LED_G,HIGH);
     
    }
    else {
      digitalWrite(LED_R,LOW);
      digitalWrite(LED_Y,LOW);
      digitalWrite(LED_G,LOW);
    }
}