Found a useful tutorial on using this tiny temperature sensor with the Arduino. Using the Raspberry Pi to program the Arduino using ‘ino’ and then monitoring the serial output with ‘ino serial’, I got a temperature reading and the whole thing, including wiring up, took me less than 15 minutes!

http://starter-kit.nettigo.eu/2010/how-to-measure-temperature-with-arduino-and-mcp9700/

Thank you kindly to the original author of the post, markal.

Next up from that same blog is using a PIR motion sensor!