![]() Currently you call preferences.end before the loop, which may be the reason why subsequent reads do not work. The second piece of code should also work, if you initialize Preferences before your loop. If it does not, please open an issue on Github. The first piece of code you listed should work on ESP32. It is similar to EEPROM library in Arduino, except that EEPROM provides a single contiguous block of storage which the sketch needs to partition between variables, while Preferences performs the partitioning itself. ![]() Preferences provides persistent (across resets) but mutable storage of various types of variables. So on ESP32, Progmem is defined for compatibility with other platforms, but it is a no-op. On the ESP32, there is no need for Progmem because constant data is automatically stored into Flash, and can be accessed from Flash without copying into RAM first. ![]() Progmem provides a way to store immutable data in program memory (which is usually Flash), instead of data memory (which is usually DRAM). The purpose of Preferences is entirely different from Progmem.
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