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

LiquidCrystal_I2C lcd(0x27,16,2);

void setup()
{
  lcd.init();
  lcd.backlight();
}

void loop() {
  int analogData = analogRead(A0);
  float volts = analogData / 1023.0 * 5.0;

  lcd.setCursor(0,0); lcd.print("Voltage: ");
  lcd.setCursor(0,1); lcd.print(volts); lcd.print(" V");
}