This is a smaller, indoor version of something that I've considered doing. I've been interested in hydroponics since reading older Heinlein, Asimov, and Norton sci-fi, and how it could combine air and water recycling, along with providing food.
This is something that I've been asked several times, usually by people who aren't into electronics. The thing is, the people who have asked me are almost always really into making/crafts or DIY, or something similar...things that Arduino is just great for!
He makes some really good points about portability, and that is a really good reason to use this. As is basic user-experience. But this is also a good starting point for security.
Yes, you read that correctly. JInvent, a company started in southern Germany back in 2008 is doing just that