I've thought of several variations on this idea. The most feasible was to have all of the electronics contained inside a plastic box, and this would stick to th

I've thought of several variations on this idea. The most feasible was to have all of the electronics contained inside a plastic box, and this would stick to the side of the fridge with magnets. I'd run a tiny 3-wire cable to the temp sensor, which would sit inside the fridge. It's not the most elegant solution, which is what I'm chasing. I'll look into reprogramming them, but assuming the Arduino prototyping board is ok, I'm only replacing the ~$5 ATMega processors.