I try to use ds3231 RTC, but it slow down. I made clear code on arduino Pro mini 5V . The code display only time.
Then i turned off arduino and RTC works only on coin battery.
After 2 days I turned it on and I get 4s delay on RTC time.
I checked voltage on battery and it is 3.32....
could you give me some adivce how to run it correctly?