app5v.js

var express = require('express'),
    app = express(),
    server = require('http').Server(app),
    io = require('socket.io')(server),
    five = require("johnny-five"),
	led5V;

app.disable('x-powered-by');

app.use(function (req, res, next) {
        res.setHeader('Access-Control-Allow-Origin', "http://"+req.headers.host+':8000');
        res.setHeader('Access-Control-Allow-Methods', 'GET, POST, OPTIONS, PUT, PATCH, DELETE');
        res.setHeader('Access-Control-Allow-Headers', 'X-Requested-With,content-type');
        next();
    }
);
app.use("/", express.static(__dirname + "/public"));

app.get('/', function (req, res) {
  res.sendfile(__dirname + '/public/index.html');
});

function invertColor(hexTripletColor) {
    var color = hexTripletColor;
    color = color.substring(1);           // remove #
    color = parseInt(color, 16);          // convert to integer
    color = 0xFFFFFF ^ color;             // invert three bytes
    color = color.toString(16);           // convert to hex
    color = ("000000" + color).slice(-6); // pad with leading zeros
    color = "#" + color;                  // prepend #
    return color;
}

server.listen(3000, "127.0.0.1");

five.Board().on("ready", function() {

  var led = new five.Led.RGB({
    pins: {
      red: 3,
      green: 5,
      blue: 6
    }
  });

  this.repl.inject({
    led: led
  });

  led.on();
  led.color("#00FFFF");

  io.on('connection', function (socket) {

    socket.on("changeColor",function(data){
		led5V = invertColor(data.hex)
        led.color(led5V);
        socket.emit('retorno', data);
    });

  });
});