RTC slows down after a few minutes and doesn't keep the correct time pace

[Dabi_Aljv]

Hello everyone.

I'm working on an automatic irrigation system using Arduino Mega 2560, TFT screen ILI9488, RTC module DS3231 and a KY-023 joystick module in a physical assembly (schematics are shown below).

Everything works fine. The problem is that the RTC doesn't keep the correct time. When the system is switched on, after a few minutes it starts to get delayed by seconds. The more time it is on, the more delay it gets. I'll leave the code I used here. It's a long code, mainly because of the screen part (it's also in Spanish, as it's my first language, you could ask some AI to translate the comments for you, sorry for that).

I would be very grateful for your help. Thanks in advance.

 

[ronsimpson]

The schematic does not show a working RTC. There are pieces missing.

 

[be80be]

most of the important pieces missing.

 

[Pommie]

The schematic does not show a working RTC. There are pieces missing.

The DS3231 is an RTC. I'm assuming it's a module so it doesn't show the crystal etc.

BTW, The OP did mention module but it wasn't very clear.

Mike.

 

[Dabi_Aljv]

View attachment 148748
The DS3231 is an RTC. I'm assuming it's a module so it doesn't show the crystal etc.

BTW, The OP did mention module but it wasn't very clear.

Mike.

Yes, it is a module that includes the crystal.

 

[Pommie]

I don't see any power connections! Are you assuming they'll be made automatically?

Mike

 

[granddad]

I usually use a 1 sec interrupt from the SQW pin to update the time.

 

[Nigel Goodwin]

I usually use a 1 sec interrupt from the SQW pin to update the time.

Likewise, it's the obvious solution