EEPROM can store data permanently unless you erase, and won’t lost when power off. Normal Arduino only have 512 bytes data space, it won’t be enough, but maybe you think a gigabyte SD card is too much. The 256Kb EEPROM will be very suitable for small mount of data storage.
- Read more about EERPOM on wiki.
- Arduino Standard EEPROM tutorial, Arduino IIC2 for EEPROM playground tutorial.
- Module Schematic.
- AT24C256 Datasheet link from Atmel
- Brand new chip, chip above the underlying code: 2ECL capacity of 256KB
- Onboard chip AT24C256 chips;
- Onboard I2C pull-up resistors;
- All pins are leads and marked;
- PCB board size: 36.5 (mm) x12 (mm)