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Period is expressed in a number of RTC counter's "ticks". For a slow clock, it's roughly 1ms (1,000/1,024 ms, to be precise). For a fast clock, it is ~30ms (1 / 32678 s). Keep in mind that the period ...

The most popular RTC for the Arduino is the DS1307. However, it does have some drawbacks, the most notable of which is that its operating voltage is 5v, which means it cannot be used with 3.3v ...