int value = 0;
float voltage;

void setup(){
  pinMode(0, OUTPUT);
    analogReference(INTERNAL); // switch to 1.1volt Aref

}

void loop(){
  value = analogRead(A2);
  voltage = value;
  if (voltage >= 1023 ) {
	 digitalWrite(0, HIGH);
  } else {
	 digitalWrite(0, LOW);
  }	 
  delay(500);
}