int led=12;
void setup()
{
  Serial.begin(9600);
  pinMode(A0, INPUT);
  pinMode(led, OUTPUT);

}
void loop()
{
  int dig_out=analogRead(A0);
  if(dig_out==1023)
  {
    digitalWrite(led, HIGH);
  }
  else
  {
    digitalWrite(led, LOW);
  }
  Serial.println(dig_out);
  delay(100);
}