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I have made a couple of clock project in the past. I have always used DS1306 module to do it. I received the backlash from my viewers. They questioned why I would use that particuler RTC module labeling it as not relaible. Now that I think of it I had issues with those RTC modules being off by a minute or two after operating for a week. Everyone pointed to DS3231 as a much more precise module. I thought to myself : “I have to give it a try”.
So here is a tutorial how to build cool looking clock using Arduino, DS3231 and OLED display.

The DS3231 is a low-cost, extremely accurate I2C real- time clock (RTC) with an integrated temperature sensor. The device has a battery input, and maintains accurate timekeeping when main power to the device is interupted”

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