Simple example for esp8266 with LCD 2004 screen by i2c

esp8266_i2c_lcd.ino

// Library https://github.com/fdebrabander/Arduino-LiquidCrystal-I2C-library
// Original from https://gist.github.com/bavensky/8cc772149df9e349014b

#include <Wire.h> 
#include <LiquidCrystal_I2C.h>
  
  LiquidCrystal_I2C lcd(0x27,20,4); 
  
  uint8_t heart[8] = {0x0,0xa,0x1f,0x1f,0xe,0x4,0x0};
  
  void setup()  {
    lcd.begin();                     
    lcd.backlight();
    lcd.createChar(1, heart);
  }
  
  void loop()  {
    lcd.home();
    lcd.print("Welcome to my world!");
    lcd.setCursor(2, 1);
    lcd.write(byte(1));
    lcd.print(" ESP8266 with");
    lcd.setCursor(0, 2);
    lcd.print(" LiquidCrystal I2C  ");
    lcd.setCursor(0, 3);
    lcd.print("4th line"); 
  }