I've hooked an AT24C256 eeprom/memory chip to Arduino Pro mini. In my code I check the memory size. It reports 64 allthough I should have 256, why? Then I erase the eeprom and check that there is nothing at address 32808 (32768-40). Then I write "Hello world!" to address 40 and check that is got …

Help using i2c and external memory (AT24C256)

newuser August 24, 2021, 6:15pm 3

Ah the 256k here is bits not bytes! The SparkFun_External_EEPROM eep.length() function reports 64000 for some reason.
Thank you for the explanation.

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Help using i2c and external memory (AT24C256)

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