Ever wanted to use any pair of pins for I2C on Arduino, not just the dedicated pins on Analog 4 & 5? Me too, so I made a quick little Arduino library called “SoftI2CMaster”, available in the “blinkm-projects” Googlecode repository. It’s still a work in progress, but it can write data pretty successfully and do it over longer cables than normal.
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You should add this to the end of the RTC datalogger page. http://ladyada.net/make/logshield/rtc.html