Keyestudio EASY PLUG Ultimate Starter Kit - Project 22: I receive a signal

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Project 21: What time is it?
Overview
In this project, we will show you how to display the time and date.
Component Required:
 EASY plug control board*1
 EASY plug DS3231 Clock Module*1
 RJ11 cable*1
 USB cable*1
Component Introduction:
EASY plug DS3231 Clock Module
The DS3231 is a low-cost, extremely accurate I2C real-time clock (RTC)
with an integrated temperature-compensated crystal oscillator (TCXO) and
crystal.
A real-time clock (RTC) is a computer clock (most often in the form of an
integrated circuit) that keeps track of the current time.
It integrated with a battery input, which can maintain accurate timekeeping
when power off. The integrated crystal resonator ensures the accuracy of
clock. So this RTC solution should be worth to try.
 Temperature range: -40℃ to +85℃
 Timing accuracy: about ± 5ppm
 Output: 1Hz and 32.768kHz
 High speed (400kHz), I2C serial bus
 Supply voltage: 3.3V to 5.5V
 Output Level: TTL level