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

void setup() {
  // put your setup code here, to run once:
  Serial.begin(9600);
  pinMode(2, OUTPUT);

  // Convert the analog value into lux value:

}

void loop() {
  // put your main code here, to run repeatedly:

  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>10000){
    digitalWrite(2, HIGH);
  }
  if (lux < 10000){
    digitalWrite(2, LOW);    
  }
  Serial.println(lux);
}