const float GAMMA = 0.7;
const float RL10 = 50;
#include <LiquidCrystal.h>
#include <Servo.h>
int i = 0;
Servo myservo;
LiquidCrystal lcd(12,11,10,9,8,7);
void setup() {
  Serial.begin(9600);
  pinMode(5, OUTPUT);
  myservo.attach(6);
  lcd.begin(16,2);
}

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));
  lcd.setCursor(2, 0);
  lcd.print("Satatus:");
  if (lux >= 50) {
    if (myservo.read() != 180) {
      myservo.write(180);
      lcd.print("Lighting");
      tone(5, 2000);
      delay(500);
      noTone(5);
    }
  } else {
    if (myservo.read() != 0) {
      myservo.write(0);
      lcd.print("Dark    ");
      tone(5, 1000);
      delay(500);
      noTone(5);
    }
  }
  
  lcd.setCursor(0,1);
  lcd.print("lux:");
  lcd.print(lux);
delay(100);
}