Time is delayed sometimes when power of the device is off

Erriez / ErriezDS3231

DS3213 high precision RTC (Real Time Clock) library for Arduino

https://github.com/Erriez/ErriezArduinoLibrariesAndSketches

MIT License

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Time is delayed sometimes when power of the device is off #9

Closed rlone2018 closed 1 month ago

rlone2018 commented 1 year ago

i am using rtc DS3231 module and your library with esp32- WROOM in my project .... Sometimes, when the power gets cutoff, the time gets delayed from few minutes to hours... Now the main issue is when i to test myself and turn off the device , the time is not changed...Means this behaviour is random, sometimes it does delay sometimes not..... I changed the batteries of rtc module still the issue is there....Please give some solution to this ... THank you in advance

Erriez commented 1 year ago

Is your problem reproducible with one of the examples?

rlone2018 commented 1 year ago

I have been using your library for Ardiuno uno and mega microcontrollers... It works fine .... In esp32 only change i do is instead of using vcc as 3.3v esp32 pin i used direct 5 volt from the power supply... Do you think it can make this unusual behaviour...If so , can i directly use 3.3 volt esp32 pin to power rtc?

Erriez commented 1 year ago

can i directly use 3.3 volt esp32 pin to power rtc?

It depends on the used hardware, I2C SDA/SCL pull-ups and if a voltage regulator exists. There are many fake/cloned chips around which can cause random problems on lower voltages.

Suggestions:

Test on a AVR like UNO or Mega at 3.3V or test with a different DS3231.
Always check the return boolean of getTime() and read(), when it returns false, the time is invalid. If the time is behind, it is a hardware issue and not related to this library as these functions directly reads the DS3231 registers and are not touching the wall clock.

Success.