const float GAMMA = 0.7;
const float RL10 = 50;
int ldr = 13;
int led = 12;

void setup() {
  Serial.begin(115200);
  //pinMode(ldr, OUTPUT);
  pinMode(led, OUTPUT);
}

void loop() {
  int analogValue = analogRead(ldr);
  float voltage = analogValue * 5/4095.0; //konversi nilai analog murni ke nilai tegangan
  float resistance = 2000 * voltage / (1 - voltage / 5); //menghitung resistansi pada ldr
  float lux = pow(RL10 * 1e3 * pow(10, GAMMA) / resistance, (1 / GAMMA)); //menghitung lux berdasarkan formula
  Serial.print("| Lux: ");
  Serial.println(lux);

  if (lux >= 50){
    Serial.print("Status: Terang ");
    digitalWrite(led, LOW);
    Serial.print("| LED Padam ");
  } else {
    Serial.print("Status: Gelap ");
    digitalWrite(led, HIGH);
    Serial.print("| LED Nyala ");
  }
  delay(100);
}