#include <Wire.h>
#include <LiquidCrystal_I2C.h>
LiquidCrystal_I2C lcd(0x27, 16, 2);
const int pin_ldr=13;
int valor_ldr;
int led= 4;

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

void loop(){
  valor_ldr= analogRead(pin_ldr);
  lcd.setCursor(0,0); lcd.print(valor_ldr);
  lcd.setCursor(0,1); lcd.print("What´s up?");
  delay (1000); lcd.clear ();


if (valor_ldr >= 50)
  {
digitalWrite(led, HIGH);
  }
else
  {
digitalWrite(led, LOW);
  }
}