revert the accidental deletion of the file "your_name.md" by doing a checkout of this particular file in an earlier commit

Here's an update on the datalogger, the line that sets the RTC was twice in the code, but should have been there just once.

Dear students, here's my latest version of the Arduino code. Please feel free to modify it wherever you think that it can be improved. Add a delay if you want to slow down the logging speed. Best, Andreas