Library to communicate with Maxim's DS3231 high-precision real-time clock (RTC)
Eric Ayars DS3231 library with JeeLabs/Ladyada's RTC libraries spliced in by Andy Wickert
Released into the public domain by Jeelabs, Ladyada, and Eric Ayars; public domain release maintained by Andy Wickert, as his changes were mostly minor: splicing the libraries, Arduino 1.0 compatibility for Eric's DS3231 library, and adding an example or two.
15 May 2011 (text but not code updated on 11 September 2013)