#include <LiquidCrystal_I2C.h>     // if you don´t have I2C version of the display, use LiquidCrystal.h library instead

LiquidCrystal_I2C lcd(0x27,16,2);

int readPin = A2;
int ledPin = 3;

int readValue;
float Voltage;

void setup() {
  pinMode(readPin, INPUT);
  Serial.begin(9600);
  pinMode(ledPin, OUTPUT);
  lcd.begin(16, 2); 
}

void loop() {
  readValue = analogRead(readPin);
  Voltage = (readValue * 5.0) / 1023.0; 
  lcd.setCursor(0, 0); 
  lcd.print(Voltage);
  analogWrite(ledPin, int(Voltage * 51)); 
  
  delay(10);
}