#include <LiquidCrystal_I2C.h>

LiquidCrystal_I2C lcd(0x27, 16, 2);

void setup() {
  lcd.init();                 
  lcd.backlight();            
  pinMode(A0, INPUT);         
  pinMode(4, OUTPUT);         
}

void loop() {
  int a = analogRead(A0);     
  int pwm = map(a, 0, 1023, 0, 255); 
  analogWrite(4, pwm);        

  float percentage = (a / 1023.0) * 100;

  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("Potensio:");
  lcd.setCursor(0, 1);
  lcd.print(percentage, 1);  
  lcd.print("%");

  delay(500);             
}