Real Time Clock module
The RTC module is a conventional module in many circuits. You can used it to do the time-counting, especially when shut down the main power it can still work by a battery.
There are a lot of RTC ICs, and we choose the DS1307 for the module, because there is a ready-made library for it.
We have made a experimental circuit on the bread board, and it worked perfect. The RTC module will be done and on sell soon.
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