Talking to tinyduino over firmatta using johnny-five.

randomlights.js

var five = require('johnny-five');

var board = new five.Board();

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

  var leds = new Array(5);
  for (var i = 0; i < 5; i++) {
    leds[i] = new five.Led({pin: i + 5});
  }
  setInterval(function () {
    for (var i = 0; i < 5; i++) {
      var on = Math.random() > 0.5;
      leds[i][on ? "on" : "off"]();
    }
  }, 33);
});

Video at https://www.youtube.com/watch?v=F_orLdWliQI