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Has anyone attempted to build this project on a non-Arduino device? I am thinking of ESP8266 or ESP32 with Arduino bootloader, so it programmed "as an Arduino" and this code should work. They have higher speed clocks, so timings could be different.
I am about to start implementing this project and also faced the same issue. It appears this is the same library, now on GitHub:https://github.com/chrisfryer78/ArduinoRTClibraryIf you try it, can you please let us know?