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。

Macetech’s ChronoDot is a Real Time Clock module for projects requiring highly accurate time keeping and measurement. The ChronoDot uses the DS3231 chip, which features a TCXO to compensate for ...

This is a real-time clock (RTC) module for Raspberry Pi and Raspberry Pi Zero. The module is similar to Adafruit PiRTC, but uses the highly accurate Maxim Integrated DS3231 RTC IC with an integrated ...

This project implements a reliable and flexible cyclic timer system using an Arduino and a DS3231 real-time clock (RTC). It is designed for applications requiring precise periodic control with ...