Wemos and DS3231 RTC example

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The DS3231 is a low-cost, extremely accurate I2C real-time clock (RTC) with an integrated temperature-compensated crystal oscillator (TCXO) and crystal. The device incorporates a battery input, and maintains accurate timekeeping when main power to the device is interrupted. Features

Highly Accurate RTC Completely Manages All Timekeeping Functions Real-Time Clock […]