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  • I usually use for this type of things an external EEPROM; something like an AT24C02 works fine for most projects (it's 256 bytes). I just prefer external memory as it lasts more R/W cycles and because you can change it if it doesn't work anymore. Commented May 17, 2015 at 21:00
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    The ram is not cleared. The global variables are set to zero according to the 'c' standard. The unused ram keeps its value during a reset. Commented May 1, 2017 at 18:25
  • Yes, you are right. I was thinking of a power failure which leads to a loss of the data in RAM (and which makes a reinitialization necessary). Commented May 1, 2017 at 20:04
  • what about to use sdcard reader. is not so much expensive and sdcard will live lot of time. Commented Jun 3, 2018 at 14:49
  • adafruit seems to have FRAM for $5. Am i missing something? Commented Jan 29, 2021 at 4:05