Microblog: What is a Real-Time Clock Module?
A Real-Time Clock (or RTC) is, as the name suggests, a clock which keeps track of “Real Time” That is, calendar time, expressed in Hours, Days, Years, etc. This is in contrast to the internal time keepers of many small electronics, which keep track of only the amount of time that has passed since the unit was last powered on.
Some automation products include a built-in Real-Time Clock Module , but many require a separate RTC in order to keep track of time over long periods.
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