#define LDR_PIN A0

const float GAMMA = 0.7;
const float RL10 = 50;

void setup() {
  pinMode(LDR_PIN, OUTPUT);
  pinMode(13, OUTPUT);
  pinMode(12, OUTPUT);
  pinMode(11, OUTPUT);
  pinMode(10, OUTPUT);
  pinMode(9, OUTPUT);
  Serial.begin(9600);
}

void loop() {
  int analogValue = analogRead(A0);
  float voltage = analogValue / 1024. * 5;
  float resistance = 2000 * voltage / (1 - voltage / 5);
  float lux = pow(RL10 * 1e3 * pow(10, GAMMA) / resistance, (1 / GAMMA));

if(lux < 90) {
  Serial.print("Cahaya Gelap ");
  digitalWrite(13, HIGH);
  digitalWrite(12, LOW);
  digitalWrite(11, LOW);
  digitalWrite(10, LOW);
  digitalWrite(9, LOW);
}
if(lux >= 90 && lux < 120) {
  Serial.print("Cahaya Redup ");
  digitalWrite(13, LOW);
  digitalWrite(12, HIGH);
  digitalWrite(11, LOW);
  digitalWrite(10, LOW);
  digitalWrite(9, LOW);
}
if(lux >= 120 && lux < 280) {
  Serial.print("Cahaya Normal ");
  digitalWrite(13, LOW);
  digitalWrite(12, LOW);
  digitalWrite(11, HIGH);
  digitalWrite(10, LOW);
  digitalWrite(9, LOW);
}
if(lux >= 280 && lux < 320) {
  Serial.print("Cahaya Agak Terang ");
  digitalWrite(13, LOW);
  digitalWrite(12, LOW);
  digitalWrite(11, LOW);
  digitalWrite(10, HIGH);
  digitalWrite(9, LOW);
}
if(lux >= 320) {
  Serial.print("Cahaya Terang ");
  digitalWrite(13, LOW);
  digitalWrite(12, LOW);
  digitalWrite(11, LOW);
  digitalWrite(10, LOW);
  digitalWrite(9, HIGH);
}

  Serial.print(" Lux: ");
  Serial.println(lux);
  delay(100);
}