The Raspberry Pi has a bus that you can get the data from the sensors easily. Once you get that worked out it's just a matter of dealing with the data (in this case writing it out to a JSON file that gets uploaded every 15 minutes. It actually was a fairly simple application to write. There are several gems out there that help you deal with the bus and FTPing. Been toying with the idea of making the application open source but have not had much time to get it all cleaned up and optimized. My advice for finding a project you can practice your Ruby skills with is to look for problems around the house, school, or job that you can solve with automation and dig in!
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