Quite possibly the two greatest things in the world -- beer and Arduino -- have been married once again in a hack does them both justice. Accomplished maker and alcohol enthusiast Jeff Karpinski turned a spare Uno and an Ethernet shield into a gadget that automatically checks him in on Untappd. The build is connected to his kegerator through a hall-effect flow sensor that sits in his tap lines. Every time he pulls himself a pint of homebrew,
