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This program has been floating around in a couple of forms since before Christmas. Essentially, it is a program to create a CSV file on an SD card, and incorporates a data table as a buffer to prevent data loss if the card is removed, or writes come in too fast. This latest revision includes logic to create column headings at the top of the spreadsheet automatically when a new file is created on the card.
Instructions for use and importing into an existing project are in the Readme file in the zip archive.