code: function PiGlow() {
      var that = this;
  
      this._wire = null;
      this._currentState = null;
  
      Emitter.call(this);
  
      this._initialize(function (error) {
          if (error) {
              that.emit('error', error);
          } else {
              that.emit('initialize');
          }
      });
  }
docs: command that causes the hardware board to update its LED values 
  PiGlow Backend
  @constructor