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Benjaf, I would use the EEPROM, however I will be reading/writing to it a lot over time, and EEPROM has a limited lifespan. The RAM on the DS1307 however, is unlimited read/writes
How often do you dose ferts? AFAIK only writing to the EEPROM cause wear, and even then the 100.000 cycle limit is said to be a very conservative estimate.
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