#include <LiquidCrystal_I2C.h>

LiquidCrystal_I2C lcd (0x27, 16, 2);

void setup() {
  lcd.init();
  lcd.backlight();
  pinMode(11, OUTPUT);
  pinMode(A3, INPUT);
}

void loop() {
  int val = analogRead(A3);
  float vol = val / 1023.00 * 5.00;
  lcd.home();
  lcd.print("Value: ");
  lcd.print(val);
  lcd.print("           ");
  lcd.setCursor(0, 1);
  lcd.print("Voltage: ");
  lcd.print(vol);
  lcd.print(" V          ");
  int temp = map(val, 0, 1023, 0, 255);
  analogWrite(11, temp);
}