erriez/erriezds3231

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

erriezds3231's Issues

How to ensure that correct time is uploaded to DS3231

When loading the sketch SetBuildTime, time is updated, but with an offset of about 11 seconds.
So the time is not accurate, but 11 seconds later.

How to deal with this?

How change SDA and SCL pin?

Hi,

I can change SDA and SCL pin in code?
I use ESP32 and have a conflit with LCD ST7796...
tks

aggregate 'tm dt' has incomplete type and cannot be defined struct tm dt;

C:\Program Files (x86)\Arduino\libraries\ErriezDS3231\src\ErriezDS3231.cpp: In member function 'bool ErriezDS3231::getDateTime(uint8_t*, uint8_t*, uint8_t*, uint8_t*, uint8_t*, uint16_t*, uint8_t*)': C:\Program Files (x86)\Arduino\libraries\ErriezDS3231\src\ErriezDS3231.cpp:398:15: error: aggregate 'tm dt' has incomplete type and cannot be defined struct tm dt;

rtc.getAlarmFlag(Alarm2) output true recurring when it should not

Dear @Erriez , thank you for your library.
I have issue with alarm2. When I check for Alarm2 occurence in a loop, there is activation at a time when it should not activate.
This is the output from my code:
19:08:45.724 -> Alarm2 ACTIVE: rtc.getAlarmFlag(Alarm2) == true
19:48:45.753 -> Alarm2 ACTIVE: rtc.getAlarmFlag(Alarm2) == true
21:10:15.649 -> Alarm2 ACTIVE: rtc.getAlarmFlag(Alarm2) == true
00:21:05.032 -> Alarm2 ACTIVE: rtc.getAlarmFlag(Alarm2) == true
01:42:35.648 -> Alarm2 ACTIVE: rtc.getAlarmFlag(Alarm2) == true
03:01:41.943 -> Alarm2 ACTIVE: rtc.getAlarmFlag(Alarm2) == true
03:25:46.864 -> Alarm2 ACTIVE: rtc.getAlarmFlag(Alarm2) == true
03:29:18.890 -> Alarm2 ACTIVE: rtc.getAlarmFlag(Alarm2) == true
04:50:56.583 -> Alarm2 ACTIVE: rtc.getAlarmFlag(Alarm2) == true
05:16:45.625 -> Alarm2 ACTIVE: rtc.getAlarmFlag(Alarm2) == true
10:37:56.892 -> Alarm2 ACTIVE: rtc.getAlarmFlag(Alarm2) == true

after each check that rtc.getAlarmFlag(Alarm2) == true, I disable the alarm:
rtc.clearAlarmFlag(Alarm2);
Can you give some hint about this issue that I am facing?
Thank you.

How to correctly tell if the battery is drained or not?

I have an arduino project with ESP32 and I'm using this library ( which is great btw ).
Currently on power on I'm doing the following

boolean RTC::begin(){
    Wire.begin(rtcSDA_Pin, rtcSCL_Pin);
    Wire.setClock(400000);
    if( !rtc.begin() ){
        Serial.printf("[RTC] - Failed to initialize RTC\n");
        return false;
    }
    Serial.printf("[RTC] - RTC initialized\n");
    checkBattery();
    rtc.clockEnable(true);
    return true;
}

void RTC::checkBattery(){
    Serial.printf("[RTC] - Battery is %s\n", rtc.isRunning()?"charged":"drained");
}

If i call rtc.clockEnable(true); the library will tell me that the battery is ok even if it is drained.
But if i don't set the clock to true it will never be ok, even if i replace the battery.

What is the recommended way of handling the low battery? I want to report to the users that they should replace it even at runtime.
So i would call the check battery function periodically.

Get milliseconds

Hello, You make a good job !
Is it possible to get milliseconds from DS3231 ?
thanks

Time is delayed sometimes when power of the device is off

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

[QUESTION] How to check if the battery is dead or not?