NodeJs script to parse webpages and send data to Arduino via Serial connection

parse.js

#!/usr/bin/env node

/* Info that is likely to be different for you */
var ARDUINO_PORT = "/dev/tty.usbserial-A1004c6U",
    URL = 'http://www.cotizacion-dolar.com.ar/',
    FETCH_CICLE = 30 * 60 * 1000;

/* Probably it's not a good idea to modify the following lines */
var jsdom = require("jsdom"),
    sp = require("serialport"),
    SerialPort = sp.SerialPort,
    serialPort = new SerialPort(ARDUINO_PORT, {
        baudRate: 9600, // this is synced to what was set for the Arduino Code
        dataBits: 8, // this is the default for Arduino serial communication
        parity: 'none', // this is the default for Arduino serial communication
        stopBits: 1, // this is the default for Arduino serial communication
        flowControl: false
    }),
    LCD_MAX_CHARS_LINE = 16;


console.log('Connecting to Arduino');

// Firing it up
fetchDataOnline();

var timer = setInterval(fetchDataOnline, FETCH_CICLE);

/**
 * Consumes the webpage and get out the info we need
 */
function fetchDataOnline(){

    console.log("Fetching data from web...");
    jsdom.env(
        URL,
        ["http://code.jquery.com/jquery.js"], // adding jQuery for happy traversing and parsing
        function(errors, window) {

            if (errors) {
                console.warn(errors);
                return;
            }

            // Now all the fetching and data processing
            var data = window.$('.cotizaciones3').map(function() {
                return window.$(this).text().trim()
            }).get();

            console.log("fetched: ", data);
            sendData(data);

        });
}

/**
 * Arrange the data and send it to Arduino
 * @param data array
 */
function sendData(data){
    if (data.length < 4) return;

    // First line
    var line = createCenteredLine('Dolar: ' + data[0] + '/' + data[1]);

    // Second line
    line += createCenteredLine('Euro: ' + data[2] + '/' + data[3]);

    // Send it out to serial
    serialPort.write(line);
}

/**
 * Append and pre-append spaces to center the content on the line
 * @param content string
 * @returns {string}
 */
function createCenteredLine(content){
    var padding = LCD_MAX_CHARS_LINE - content.length,
        line = '';

    if(padding > 1){
        padding = Math.floor(padding/2);
    }

    for(var i = 0; i < padding; i++){
        line += " ";
    }

    line += content;

    for(var i = 0;  i < (LCD_MAX_CHARS_LINE - line.length); i++){
        line += " ";
    }

    return line;
}

Thanks for providing such a good sample