== Ingredients ==
[[image:Raspberry Pi.jpg|thumb|500px600px|left|Raspberry Pi as controller]]<br clear=both>
[[image:Hottub controller display and Pi.jpg|thumb|500px|left|display and control butttons, found at http://www.emsystech.de/produkt/raspi-lcd/]]<br clear=both>
[[image:Hottub relay board.jpg|thumb|500px|left|relay board for outputs]]<br clear=both>