#include <Wire.h>
#include <LiquidCrystal_I2C.h>
LiquidCrystal_I2C lcd(0x27, 16, 2);

const int relay1=13, Sldr=15;
void setup(){
  lcd.init();  lcd.backlight();
  pinMode(relay1, OUTPUT);

}
void loop(){
  float Vldr= analogRead(Sldr);
  if(Vldr>2000){digitalWrite(relay1, HIGH);  }
  if(Vldr<2000){digitalWrite(relay1, LOW);  }

  lcd.setCursor(8,1); lcd.print(Vldr);
  //HAY QUE LIMPIAR CADA PROCESO
  delay(1000); lcd.setCursor(0,1); lcd.print("                ");//ponemos 16 espacios para no ver basura
}