#include <LiquidCrystal_I2C.h>

int LED = 12;

#define LDR_PIN 2

LiquidCrystal_I2C lcd(0x27, 20, 4);

void setup() 
{
  pinMode(LDR_PIN, INPUT);
  lcd.init();
  lcd.backlight();
  pinMode(LED, OUTPUT);
  digitalWrite(LED, LOW);
}

void loop() 
{
  lcd.setCursor(2, 0);
  if (digitalRead(LDR_PIN) == LOW) {
    lcd.print("Bright");
    digitalWrite(LED, HIGH);
  } else {
    lcd.print("Dark!!");
    digitalWrite(LED, LOW);
  }
  delay(100);
}