Using DS1307 and DS3231 real-time clock modules with Arduino

We keep getting requests on how to use DS1307 and DS3231 real-time clock modules with Arduino from various sources – so this is the first of a two part tutorial on how to use them. For this Arduino tutorial we have  two real-time clock modules to use, one based on the Maxim DS1307: There are two main differences between the ICs on the real-time clock modules, which is the accuracy of the time-keeping. The D ...

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