Depending on the amount of data you are saving, I2C and SPI chips will
store data in "pages" which can be pretty easily written.

Another option, if you need lots of storage, is an Atmel Serial DataFlash,
or one of the camera memory chips.  Judging from your question, though,
those are probably a little ways in your future for ability.  Stick with
it, you'll think this a trivial exercise in a few months.

Andy

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