GitHub

Circuit-Digest/ESP32-Real-Time-Clock-using-DS3231-Module

A Precision Real-Time Clock System using ESP32, DS3231 RTC module, and SSD1306 OLED display for accurate timekeeping with battery backup. Features high-precision temperature-compensated crystal ...
note

RTCモジュール（DS3231）を試す（1）

DS1302、40NTD（約150円）と格安なのはいいのですが、どうも誤差が大きくて一日で十秒以上もずれてしまいます。およその時間を取得するにはいいですが、 みたいなことをやったところ、誤差が大きすぎて、かなり「残念！」な時計になってしまいました。
GitHub

ds3231-rtc

The project integrates an Arduino with a DHT11 sensor for measuring temperature and humidity, along with an RTC DS3231 module for maintaining real-time clock functionality. The Arduino periodically ...
Hackaday

DS3231 RTC

A man named [Jim Valvano] once said “There are 86,400 seconds in a day. It’s up to you to decide what to do with them.” — while we couldn’t tell you who [Jim Valvano] was without a google search*, his ...