I use an Arduino temperature and relative humidity logging package where I have to be able to disconnect the Arduino from a 9V power source to record the T and RH in various places. I wanted to be able to reset/restart the Arduino without losing any data already recorded on the SD card, and wanted t…

Create unique SD filename automatically after reset, without extra hardware

robtillaart January 11, 2013, 9:19pm 3

OR, you can have a file (number.txt) in which the first free number is mentioned.

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