#include <LiquidCrystal_I2C.h>

#define LDR_PIN 2
int led=13;
LiquidCrystal_I2C lcd(0x27, 20, 4);

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

void loop() {
  lcd.setCursor(2, 0);
  lcd.print("Room: ");
  if (digitalRead(LDR_PIN) == LOW) {
    lcd.print("Light!");
    digitalWrite(led,HIGH);

  } else {
    lcd.print("Dark  ");
    digitalWrite(led,LOW);
  }
  delay(100);
}