#include <LiquidCrystal_I2C.h>
#define LCD_ADDR 0x27
#define LCD_COLUMNS 16
#define LCD_ROWS 2

LiquidCrystal_I2C lcd(LCD_ADDR, LCD_COLUMNS, LCD_ROWS);
void setup() {

  lcd.begin(0x27,16, 2);
  lcd.init();
  lcd.backlight();
}

void loop() {
  int sensorValue = analogRead(A0);
  // Convert the analog reading (which goes from 0 - 1023) to a voltage (0 - 5V):
  float voltage = sensorValue * (5.0 / 1023.0);
  // print out the value you read:
  lcd.setCursor(2,0)
  lcd.print(voltage);
  lcd.print("v");
  delay(1000);
  lcd.clear();
}