EEPROM on Nano ESP32: how?

Official Hardware Nano Family Nano ESP32
1

Hi all,

EDIT: SOLVED. SEE BELOW

I used EEPROM to save a setting (message for a scrolling display) using a regular Nano, and that worked.

The same code, namely #include <EEPROM.h>, and then EEPROM.write(0, messageNumber); and later messageNumber = EEPROM.read(0), does not work on a Nano ESP32.

Should it still work? If so, any idea how?

(I have of course first searched, both this forum and Google).

Thanks!
M

Solution: I need to allocate EEPROM

EEPROM.begin(256);
delay(500);

And then also do a EEPROM.commit after I write to EEPROM. I am not sure that last step is actually necessary (yet), but it does no harm.

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2

I thought i remember reading EEPROM.h was not a good idea to use with Nano ESP32 as they do not truly have an eeprom…

i believe you may want to look into start using <preferences.h> to store into the flash properly…

Im by no means a coder and if its working for you then stick with your original ideA, just maybe the data may be corrupted down the road???

Take care

3

Thanks. I’ve found very little good info, so I hope someone here can point me in the right direction, if there’s a better way.

4

That is a common problem as the EEPROM is non existent but simulated in RAM and saved in flash. You need to commit the EEPROM to flash with this statement"
EEPROM.commit();, for more information check ESP32 Flash Memory - Save Permanent Data | Random Nerd Tutorials

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5

Again… no coder here and not sure what outdated and deprecated means

In that very link you provided, at the top, he specifically states it is outdated and deprecated and to use <preferences.h>,,,

6

Excellent! I’ll give that a go.

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