If you want to store calibration values, MAC addresses, non-secure access tokens, or other unique identifiers, EEPROM storage is a great option. The Adafruit 24LC32 I2C EEPROM breakout comes with 32 Kbit (4 KByte) of storage, and handy chainable Stemma QT connectors, it’s just the right amount of simple I2C-controllable storage. Since its external to your microcontroller or microcomputer, uploading new flash memory won’t wipe the data from this chip.
The Adafruit 24LC32 I2C EEPROM Breakout guide has everything you need to get started with using this EEPROM breakout. There’s pages for overview, pinouts, CircuitPython, Arduino and download resources.
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