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I’ve created highly documented code which will walk you through how to write an Arduino alarm clock application. Now I’ll show you exactly how to build something you can use. I’ve written about the advantages of using a DS3231 real-time clock in your Arduino project, and I’ve described how to connect and communicate with DS3231 using Arduino.

And if you’re looking to brush up on Arduino programming in general, this is exactly what you’re looking for. If you’re looking to build an alarm clock with an Arduino and the DS3231 Real Time Clock module, this is exactly what you’re looking for.