How to connect DS3231 to ESP8266 using GPIO2 and GPIO14 and using SQW?

Hello, I am working on my first project in Eagle, in order to get to know the program and learn how to design. It fell on an LED lamp. I should add that the board is not of my own making, but borrowed from one of the posts from this forum (with minor aesthetic tweaks).

1 I would like to add a DS3231 to it to create an LED clock, however I have a problem with the SCL and SDA connections. I gather from the ESP8266 datasheet note that I need to connect these pins from the DS3231 to GPIO2 (SDA) and GPIO14 (SCL), however it also says that GPIO14 is responsible for the IR. Have I misunderstood this? How do I solve this so that one does not interfere with the other?
2 Also, how should I use SQW and 32kHz in my project? I should connect a quartz resonator to the 32kHz to make it work at all? What about the SQW?
3. what about the signals on the right side of the DS3231? GND and VCC to ground? What about SCL_2 and SDA_2? I understand that these are my IC output signals, but what to do with them? Should they be somehow connected to the LED lights (I will want to use the WS2812)?

Thanks in advance for your time. I'll also add for my defence that I'm a second year student and we haven't had anything design related yet. I am trying to do some design on my own as a hobby.
Greetings.
.

piotrkarpik8 wrote:

I understand that these are my IC output signals, but what to do with them? Should they somehow be linked to the LED lights (I will want to use the WS2812)?

.
These are the leads of the 24C32 memory that is also on this module.
If this is the module: https://diolut.pl/modul-pomiaru-czasu-rtc-ds3...MIu6Cs6ejD5AIVzqSaCh0ERgzfEAYYASABEgIWzfD_BwE

piotrkarpik8 wrote:

2. Also, how should I use SQW and 32kHz in my project? Should I connect a quartz resonator to the 32kHz to make it work at all? What about the SQW?

.
SQW and 32kHz are the outputs. Take a look at the DS's datasheet note. The quartz resonator is already "on board".

I have connected and made the design as follows. I would ask you to check the correctness of the connections and for any advice and guidance.
If the whole schematic was needed I will upload it, but I am most concerned with the correctness of the RTC connection to the ESP.

Regards.

.

What voltage is supplied to the RTC chip itself?
The choice of GPIO2 from the ESP8266 as the SDA line is not the happiest:
https://randomnerdtutorials.com/esp8266-pinout-reference-gpios/

On the ESP8266, the standard pins for I2C are GPIO4 and GPIO5, and this is also the case on the popular Wemos mini and Node MCU boards:
.
All in all it's some sort of soft solution on the ESP8266 anyway, so it could be on a different pin, but for the record GPIO14 is the SPI clock.
Doing it your way you will still have to correct something when programming.
There are no pull-up resistors for the I2C lines to VCC, maybe the clock module has them soldered on, maybe you don't need them, but if you're making your board from bare chips they probably should be.

Now I noticed that you are powering the DS3231 module from 5V, so without logic level converters on I2C to ESP8266 you will be out. Some of these DS3231 modules can be powered from 3.3, then you would avoid the need for these converters.