It is possible to export data directly from your widget into a csv. For this, you first create the widget as you would like the data to export. If you click on the widget to enlarge it, you enter in the explore page of that widget. In explore you can read the information from all of your sensors with various options to narrow down the exact information and export them. You can eg determine the time frame and the interval of the sensors.
Click on the arrow button in the upper right corner to export the data you are viewing. You will receive an email when the export is done.