#include <LiquidCrystal_I2C.h>

LiquidCrystal_I2C lcd(0x27, 16, 2);

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

void loop() {
  int analogValue = analogRead(A0);       
  float voltage = analogValue * (5.0 / 1023.0); 

  lcd.setCursor(0, 0);   
  lcd.print("Voltage: "); 
  lcd.print(voltage, 2); 
  delay(500);            
}