Adafruit Data Logging Shield for Arduino

The Adafruit Data Logging Shield for Arduino lets you save data to files on any FAT16- or FAT32-formatted SD card easily from an Arduino, which can then be read by most plotting, spreadsheet, or analysis programs. The onboard real time clock (RTC) timestamps all your data with the current time, so that you know precisely what happened when. This is the “revision B” version of the data logging shield.