#include <LiquidCrystal.h>
#define LDR_PIN 2

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

LiquidCrystal lcd(12, 11, 10, 9, 8, 7);

void setup() {
  pinMode(LDR_PIN, INPUT);

  lcd.begin(16, 2);
}

void loop() {
  lcd.clear();
  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(0, 0);
  if(lux < 50){   
    lcd.print("Status:Dark");
  }else{   
    lcd.print("Status:Lighting");
  }

  lcd.setCursor(0, 1);
  lcd.print("Lux:");
  lcd.print(lux);
  lcd.print("          ");

  delay(100);
}