BenConstable/app.js

## app.js
var express = require('express')
  , app     = express()
  , server  = require('http').createServer(app)
  , io      = require('socket.io').listen(server)
  , five    = require('johnny-five')
  , board   = new five.Board({ port:'/dev/tty.usbmodemfa131'} )
  , led;

// Listen for lights change
io.sockets.on('connection', function (socket) {
    socket.on('lights', function (data) {
        led[data.state]();
    });
});

// Start server when board is ready
board.on('ready', function () {
    led = new five.Led(13)

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

    server.listen(3000);
});

## index.html
<!DOCTYPE html>
<html>

    <head>
        <title>Arduino Over Sockets</title>
        <script src="/socket.io/socket.io.js"></script>
    </head>

    <body>
        <button id="lights"></button>

        <script>
            (function () {
                var socket   = io.connect('http://localhost:3000/')
                  , lights   = false
                  , controls = document.getElementById('lights');

                controls.onclick = function () {
                    lights = !lights;

                    socket.emit('lights', {
                        message: controls.innerHTML
                      , state: lights ? 'on' : 'off'
                    });

                    updateControls();
                };

                var updateControls = function () {
                    controls.innerHTML = 'Lights ' + (!lights ? 'on' : 'off');
                };

                updateControls();
            })();
        </script>
    </body>

</html>
	var express = require('express')
	, app = express()
	, server = require('http').createServer(app)
	, io = require('socket.io').listen(server)
	, five = require('johnny-five')
	, board = new five.Board({ port:'/dev/tty.usbmodemfa131'} )
	, led;

	// Listen for lights change
	io.sockets.on('connection', function (socket) {
	socket.on('lights', function (data) {
	led[data.state]();
	});
	});

	// Start server when board is ready
	board.on('ready', function () {
	led = new five.Led(13)

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

	server.listen(3000);
	});
	<!DOCTYPE html>
	<html>

	<head>
	<title>Arduino Over Sockets</title>
	<script src="/socket.io/socket.io.js"></script>
	</head>

	<body>
	<button id="lights"></button>

	<script>
	(function () {
	var socket = io.connect('http://localhost:3000/')
	, lights = false
	, controls = document.getElementById('lights');

	controls.onclick = function () {
	lights = !lights;

	socket.emit('lights', {
	message: controls.innerHTML
	, state: lights ? 'on' : 'off'
	});

	updateControls();
	};

	var updateControls = function () {
	controls.innerHTML = 'Lights ' + (!lights ? 'on' : 'off');
	};

	updateControls();
	})();
	</script>
	</body>

	</html>