const char AnalogIN = 13;
// LDR Characteristics
const float GAMMA = 0.7;
const float RL10 = 50;

void setup() {
  Serial.begin(115200);
}

void loop() {
  float voltage = analogRead(AnalogIN) / 4095. * 5;
  float resistance = 2000 * voltage / (1 - voltage / 5);
  float lux = pow(RL10 * 1e3 * pow(10, GAMMA) / resistance, (1 / GAMMA));
  Serial.println(lux);
  delay(1000);
}