#define OUT 5
#define ADC 0


void setup() {
  ADMUX &= (0<<REFS0); //Setting reference voltage to internal 1.1V
}

// the loop routine runs over and over again forever:
void loop() {
  // read the input on analog pin 0:
  int sensorValue = analogRead(0);

  float voltage = sensorValue * (1.1 / 1023.0);

  if (voltage>0.5){
    digitalWrite(OUT,HIGH);
  }

  else{
    digitalWrite(OUT,LOW);
  }
}