If your project needs to store lots of data you need a datalogger, this Open Source Hardware SD Datalogger allows you to store tons of data onto an SD card.
Via: Elektronika.ba
"This project provides a general purpose library which implements read and write support for MMC, SD and SDHC memory cards.
It includes
- low-level MMC, SD and SDHC read/write routines
- partition table support
- a simple FAT16/FAT32 read/write implementation"
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