Erriez/ErriezDS3231

Time is delayed sometimes when power of the device is off

Closed this issue · 3 comments

rlone2018 commented

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

Is your problem reproducible with one of the examples?

rlone2018 commented

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

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.