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I need to save some values (and be able to update them frequently) that will stay there even after powering down the Arduino. (I didn't specifically choose any board yet, but UNO or Mega will be probably best for me).

(the values will be a short time informations)

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    How often do you need to write? EEPROM is usually ok but has limited write cycles. I usually recommend adding an external EERAM chip like the 47C16.
    – Majenko
    Sep 15 at 9:34
  • About every 1 minute or so.
    – krystof18
    Sep 15 at 9:35
  • That frequency would kill EEPROM after about 2-3 months.
    – Majenko
    Sep 15 at 9:37
  • That isnt really good. What about the flash memory?
    – krystof18
    Sep 15 at 9:38
  • A week. Take a look at the 47C16 chip from Microchip.
    – Majenko
    Sep 15 at 9:49

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