The idea of using a slow-cooker as a sous-vide system is great! The implementation of using a slow-cooker as a sous-vide system, not so much.

Slow-cookers have a lot of lag in the system; they take a long time to start, and stop, heating. The significant lag presents some substantial impediments to designing a control system, of any sort. While I'm not one to give up easily, I am one to be pragmatic and take a more simple approach when I see one...

...and thus, here we are.

So, what do you get when you cross a lobotomized 300W fish-tank heater, an aquarium air-pump, an Arduino, a Raspberry PI, a PSSR/ZC Tail, and a little bit of code?

You guessed it, a sous-vide miracle!

I'll be back after the break with some pictures, data, and a verdict. (It takes a long time to heat up water!)