Thinking about a temperature logger. Collect temperature data in the lab and outside for 1 week, with a timer attached. Then store temperature data and time on an external EEPROM. I have a Sparkfun EEPROM and could use the arduino library for this EEPROM by initiating I2C protocol. Code for this EEPROM is available here, but make sure to read the comments to this blog for some critical changes.
Here is a microSD card shield that interfaces to bradboard/arduino, used by fat16lib in his post
Some arduino version with an LCD using I2C interfaces as a stand alone, and the code for reading and writing is loaded. Second version attached to PC and uses Perl to log and plot.
Dumping data to excel is outlined in this thread
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