Make this guy dance: https://www.dropbox.com/s/oa7fi5ted2xi1c5/johnny-five-spark-device.jpg

spark-io-wave.js

var five = require("../lib/johnny-five.js");
var Spark = require("spark-io");

var board = new five.Board({
  io: new Spark({
    token: "a81cf99a8c1fe45b74d749d521a32671eb443d5e",
    deviceId: "53ff6f065067544840551187"
  })
});

board.on("ready", function() {
  var dir = 0;
  var servo = new five.Servo("D0");

  setInterval(function() {
    var pos = 120;
    if (dir ^= 1) {
      pos = 60;
    }
    servo.to(pos);
  }, 750);
});