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var five = require("johnny-five");
var board = new five.Board();

board.on("ready", function() {

  // Create a standard `led` component instance
  var led = new five.Led(13);

  // "blink" the led in 500ms
  // on-off phase periods
  led.blink(500);
});

  1. $ npm install johnny-five

  2. Cargar StandardFirmata en Arduino

  $ node index.js

index.js

Ejemplos !

Sensor de pulsos

serialPort.open(function (error) {
  if ( error ) console.log('failed to open: '+error);
  else {
    serialPort.on('data', function(data) {
      if( data != "\n" && data.substring(0,1) == 'S'){
        console.log('data received: ' + data)
        
        app.io.broadcast('data', {
	 data: data.substring(1)
	})
      }
      else console.log('>>>>>>>>>>>>> ', data)
   });
  }
});

Vending Machine

stream.on('follow', function ( user ) {
    var user = user.source.screen_name;

    if (follower.toLowerCase() == user.toLowerCase())
    {
	//Se activa el servo, por dos segundos
	console.log('tenga buen hombre su regalo!')
	servo.ccw();
	sleep.sleep(2);
	servo.stop();
    }
})

Vending Machine

var five = require('johnny-five'),
    sleep = require('sleep'),
    express = require('express.io'),
    path = require('path'),
    app = express(),
    board,
    userFollowingUs;

app.http().io();
app.use( express.static( path.join( __dirname, 'public' ) ) )

var board = new five.Board({port: 'COM11'});

board.on("ready", function() {

	var servo = new five.Servo({
	pin: 10,
	type: "continuous"
	});

	var Twit = require('twit')
	 
	var T = new Twit({
		consumer_key:         key,
		consumer_secret:      secret,
		access_token:         accessToken,
		access_token_secret:  accessTokenSecret,
		timeout_ms:           60*1000,  // optional HTTP request timeout to apply to all requests. 
	})


	var stream = T.stream( 'user' )
	 
	stream.on('follow', function ( user ) {
		console.log( user )
		if ( userFollowingUs.toLowerCase() == user.source.screen_name.toLowerCase() ){
			//Se activa el servo, por dos segundos
			console.log('tenga buen hombre su regalo!')
			servo.ccw();
			sleep.sleep(2);
			servo.stop();
		}
	})

	app.io.route('click', function( request ) {
		console.log( '=> User: ', request.data.user )
		userFollowingUs = request.data.user
	    //led.color( request.data.color )
	})

	app.set('port', process.env.PORT || 3000)

	var server = app.listen(app.get('port'), function() {
		console.log('Express server listening on port ' + server.address().port)
	})
})

var button = document.getElementById('button');
io = io.connect();

button.onclick = function(){
	user = document.getElementById('input').value
	label = document.getElementById('label');
	label.innerHTML  = user + " gracias por seguirnos!";
	/* Emitimos el evento click, para notificar al servidor. */
	io.emit('click', { user: user }); 
}

cliente

servidor

Gracias!

@_JuraseC

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