How smart is your cell phone? The founder of Diva Coffee, an Australian franchise chain, developed an app that allows consumers to brew their own coffee at home by using their Android phones or tablets. The app works via a controller that plugs into the back of a wide variety of home coffee machines, enabling consumers to set the temperature and program the size of the coffee, among other options. Each drink can be individualized to suit consumer preferences, and these selections can be stored in the app. The app software also adds power saving and boiler protection features to coffee machines, saving on electricity and repair costs, the company says.