Node.js

• JavaScript del lado del servidor
• Aplicaciones web en tiempo real escalables 
• Non-blocking
• Asíncrono
• Orientado a eventos
• NPM

Non-blocking, Asíncrono y Orientado a Eventos

NPM

Firmata

Firmata, es un protocolo que permite comunicar microcontraladores con una aplicación que esta siendo ejecutada desde una computadora (host)

010101101110

https://github.com/firmata/protocol

Host

Implementaciones

Johnny five

https://github.com/rwaldron/johnny-five   -  by  Rick Waldron

$( document ).ready(function() {
    $( "button" ).on( "mousedown", function() {
      console.log( "button down" );
    });
});

IoT and Robotics programming framework

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

  button = new five.Button({
    pin: 2,
    isPullup: true
  });

  button.on("down", function(value) {
    console.log("down");
  });
});

var five = require("johnny-five"),
    button, led;

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

  button = new five.Button({
    pin: 2,
    isPullup: true
  });

  button.on("down", function(value) {
    console.log("down");
  });
});

$ npm i johnny-five

$ node button.js

button.js

Button.js

var keypress = require('keypress');
var five = require("johnny-five"),
    board;

// Johnny-Five will try its hardest to detect the port for you,
// however you may also explicitly specify the port by passing
// it as an optional property to the Board constructor:
board = new five.Board({
  // port: "/dev/tty.itead-DevB"
  port: "/dev/cu.itead-DevB"
});

// board = new five.Board();
board.on("ready", function() {
  var speed = 80;

  console.log("Repl instance auto-initialized ready!!!");
  
  motor1 = new five.Motor([10, 8]);
  motor2 = new five.Motor([9, 7]);

  // motor1 = new five.Motor({
  //   pins:{
  //     pwm: 10,
  //     dir: 8
  //   }
  // });

  // motor2 = new five.Motor({
  //   pins:{
  //     pwm: 9,
  //     dir: 7 
  //   }
  // });

  board.repl.inject({
  	lmotor: motor1,
  	rmotor: motor2,
  });

  // make `process.stdin` begin emitting "keypress" events
  keypress(process.stdin);

  // listen for the "keypress" event
  process.stdin.on('keypress', function (ch, key) {
    if (key && key.ctrl && key.name == 'c') {
      process.exit(0);
    }

    if ( key ){
      switch ( key.name ){
        case 'up':
          speed+=20;
          console.log(' => Up: ' + speed);
          motor1.rev( speed );
          motor2.rev( speed );
          break;
        case 'down':          
          speed+=20;
          console.log(' => Down: ' + speed);
          motor1.fwd( speed );
          motor2.fwd( speed );
          break;
        case 'left':
          console.log(' => Left: ');
          motor1.fwd( speed * 0.5 );
          motor2.rev( speed * 0.5 );
          break;
        case 'right':
          console.log('right');
          motor1.rev( speed * 0.5 );
          motor2.fwd( speed * 0.5 );
          break;
        case 'space':
          console.log(' => Stoping...');
          motor1.stop();
          motor2.stop();
          break;
        case 'r':
          console.log(' => Speed to 80');
          speed = 80;
          break;  
        default:
          console.log('Ignoring key: ' + key.name);
      }
    }

  });

  process.stdin.setRawMode(true);
  process.stdin.resume();
 
});

https://github.com/jurasec/johnny-five-guide/blob/master/example/WirelessNodeBotZumoArrows.js

$ node WirelessNodeBotZumoArrows.js

button.js

WirelessNodeBotZumoArrows.js