title_body: General How-To: Arduino Based PID for Saeco Aroma
upvoted_answer: I have seen many people playing with their Arduino's for robot control, industrial control and even for architectural projects. It seems easy to play with Raspberry Pi and Arduino for such projects.
  
  So after I've seen this question here, I have take a look at it.
  
  I found a useful demo here. It has some links including the libraries and the code in German in the video explanation. Unfortunately, the links are broken. Maybe you can try to e-mail them.
  
  Anyhow, if you start a garage project, it should not be that difficult (in theory). There must be a few sensors; some actuators to pump the water through heaters; as well as a µC or a cheap good-old µP like Motorola 68k or an Arduino-like µP recently.