// LDR Characteristics
const float GAMMA = 0.7;
const float RL10 = 50;

void setup() {
  // put your setup code here, to run once:
  Serial.begin(9600);
  pinMode(A1, INPUT);
}

void loop() {
  // put your main code here, to run repeatedly:
  int analogValue = analogRead(A1);
  float voltage = analogValue / 1024. * 5;
  float resistance = 2000 * voltage / (1 - voltage / 5);
  float lux = pow(RL10 * 1e3 * pow(10, GAMMA) / resistance, (1/ GAMMA));
  Serial.println(lux);
  delay(2000);
}