#include <Wire.h>
#include <LiquidCrystal_I2C.h>

LiquidCrystal_I2C lcd(0x27,16,2);

int potint=A0;
int lectura;
int vab;

void setup(){
  lcd.init();
  lcd.backlight();
  lcd.setCursor(0,0);
  pinMode(2, OUTPUT);
  pinMode(3, OUTPUT);
  pinMode(4, OUTPUT);
  pinMode(5, OUTPUT);
}

void loop() {
  // put your main code here, to run repeatedly:
lectura=analogRead(potint);
vab=lectura/4;
   lcd.setCursor(0,0);
lcd.print("POTENCIOMETRO");
delay(500);
lcd.setCursor(0,1);
lcd.print(vab);
switch(vab){
  case 100:
  digitalWrite(2, HIGH);
  lcd.setCursor(8,1);
  lcd.print("LED 1");
  break;
  case 110:
  digitalWrite(3, HIGH);
  lcd.setCursor(8,1);
  lcd.print("LED 2");
  break;
  case 144:
  digitalWrite(4, HIGH);
  lcd.setCursor(8,1);
  lcd.print("LED 3");
  break;
  case 255:
  digitalWrite(5, HIGH);
  lcd.setCursor(8,1);
  lcd.print("LED 4");
  break;
  default:
  digitalWrite(2, LOW);
  digitalWrite(3, LOW);
  digitalWrite(4, LOW);
  digitalWrite(5, LOW);

  break;
  }
  delay(500);
  lcd.noCursor();
  delay(500);
}