Hello,
I have a problem with a Ds3231 Rtc module. I manage to set the time with a program, but as it doesn’t get power, it changes a lot after I give it power again… 
I used RTC_SAMD21.h
Thank you.
may i recomend
I don t understand …
Can you send me the full name or sku of the product you are using? I can’t seem to pinpoint the product you are using very well