void setup() {
  Serial.begin(9600);
  pinMode (13, OUTPUT);
  pinMode (A0, INPUT);
}

void loop() {
  // reads the input on analog pin A0 (value between 0 and 1023)
  int light = analogRead(A2);

  Serial.print("Analog reading = ");
  Serial.println(light);   // the raw analog reading
  int lamp = map (light, 0, 1023, 100, 0);
  if (lamp <= 50){
    digitalWrite (13, HIGH);
    Serial.println ("GELAP");
  }else{
    digitalWrite (13, LOW);
    Serial.println ("TERANG");
  }
  delay(1000);


}