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

void setup() {
  // put your setup code here, to run once:
pinMode(4, OUTPUT);
}

void loop() {
  // put your main code here, to run repeatedly:
int sensorValue=analogRead(A1); // read the sensor value
// convert sensor reading into lux
float voltage = sensorValue / 1024.0 * 5;
float resistance = 2000 * voltage / (1 - voltage / 5);
float lux = pow(RL10 * 1e3 * pow(10, GAMMA) / resistance, (1 / GAMMA));
// decision making

if(lux<800){
  digitalWrite(4, HIGH);
  delay(500);

}
else {
  digitalWrite(4, LOW);
  delay(500);

}


}