DS3231 RTC Module Pinout, Configuration, Example Circuit & Datasheet
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mosfet - How to switch ON a Raspberry Pi, Arduino, ESP32, etc from SQW pin of RTC DS3231 - Electrical Engineering Stack Exchange
In-Depth: Interface DS3231 Precision RTC Module with Arduino
Problem with Ds1307 and SQW pin to GND - Networking, Protocols, and Devices - Arduino Forum
RTC square wave - Arduino Stack Exchange
