Emulate Hitachi HD44780 and compatible devices in HTML

npm install char-lcd --save
or yarn add char-lcd
or clone the whole project from GitHub

https://github.com/jazz-soft/polymer-char-lcd

<script src="char-lcd.js"></script>
//...

<script src="https://cdn.jsdelivr.net/npm/char-lcd"></script>
//...

<script src="https://unpkg.com/char-lcd"></script>
//...

var CharLCD = require('char-lcd');
//...

import { CharLCD } from 'char-lcd';
//...

require(['char-lcd'], function(CharLCD) {
  // ...
});

<div id=lcd></div>
...
var lcd = new CharLCD({ at: 'lcd', rows: 2, cols: 16, rom: 'eu' });
// Map UNICODE string to the internal character set:
lcd.text(0, 0, "ЁЛКИ-ПАЛКИ!");

var lcd = new CharLCD(params);
params is an object with the following keys:

• at: a DOM element in which to place the object, or its id; default: at the bottom of the page;
• rom: jp (default) for Japanese standard font, or eu for European standard font.
• rows: - number of rows; default: 2;
• cols: - number of columns; default: 16;

Unlike the real hardware where only certain combinations of rows/cols exist, there are no restrictions in the simulator;

lcd.char(r, c, h); - set the character at row r, column c to byte h.

lcd.text(r, c, s); - print string s at row r, column c.
This function treats \n as new line and maps UNICODE characters to the internal character set.

lcd.font(n, data); - define the pixels for the n-th character; data is an array of up to 10 bytes.
In real hardware, only first 8 characters can be changed, but there is no such limitation in the simulator.