The ingenuity of the hackspace community always surprises me. Brian Carrigan took an old supermarket scanner, hooked up to a Pi with some custom software and boom. He now has a quick way to flesh out his next shopping list. It’s a long-ish read, but absolutely worth your time. The bit with the oscilloscope is somewhat beyond my knowhow mind you, so I couldn’t have done it.
Via Raspberry Pi Blog.