code: function setEnabledStateOfLed(callback) {
      var index = 0;
      
      var setEnabledStateOfLedInterval = setInterval(function() {
          if (index <= 5) {
              dothat.barGraph.setEnabledStateOfLed(index, false);
              
              index++;
          } else {
              clearInterval(setEnabledStateOfLedInterval);
              
              if (callback) {
                  callback();
              }
          }
      }, 500);
  }
docs: Sets the enabled state of each individual LED in the bar graph.
  @param {Function} callback A function to call when the operation has finished.