How to use RTC in Arduino IDE ?
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How do you get time from the RTC in the M5stack ? The documentation is only for micropython. Also is the RTC battery backed up ? Thanks.
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Try using this code from this link to add to your M5stack Digital Clock example.
https://github.com/adafruit/RTClib/blob/master/examples/ds3231/ds3231.ino
you need to install the RTClib master library to make it work.