void setup()
{
  pinMode(13, OUTPUT);          // sets the digital pin 13 as output
  pinMode(12, OUTPUT);          // sets the digital pin 12 as output
  Serial.begin(9600);
}

void loop()
{
  int valorADC;
  float voltaje;
  valorADC = analogRead(A5);
  voltaje = valorADC * (5.0 / 1023.0);
  Serial.println(voltaje);
  if(voltaje>4.5)
  {
    digitalWrite(12, HIGH);       // sets the digital pin 13 on
    //delay(1000);                  // waits for a second
    digitalWrite(13, LOW);        // sets the digital pin 13 off
    //delay(1000);                  // waits for a second
  }
  else
  {
    digitalWrite(13, HIGH);       // sets the digital pin 13 on
    //delay(1000);                  // waits for a second
    digitalWrite(12, LOW);        // sets the digital pin 13 off
    //delay(1000);                  // waits for a second
  }
  delay(2);
}