We have been working on our Real Time Clock and LCD display as a snap on “shield” (no wiring). This will provide not only a time date function, but clock and display functions to other projects. We ran across another similar project at http://tronixstuff.wordpress.com/2010/10/07/add-a-real-time-clock-to-the-freetronics-twentyten/
Good stuff there, check it out.
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