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Virtuabotix DS1302 Battery Backed RTC Module for the Arduino and Versalino connected to Arduino Mega

Virtuabotix DS1302 Real Time Clock Module Pin-out and coding guide

The DS1302 trickle-charge timekeeping chip contains a real-time clock/calendar and 31 bytes of static RAM.  It communicates with a microprocessor via a simple serial interface.  The Real Time Clock / Calendar provides Seconds, Minutes, Hours, Day, Date, Month, and Year information.  Only three wires are required to communicate with the Real Time Clock / RAM: […]