A buddy of mine and I were discussion controllers yesterday and realized that we have no idea how to implement a controller into a system. I tried to find some threads here and on RC that would diagram it out but couldn't find anything. Does anyone know where I could find out how to set up a controller. I am looking to include a controller for a modest setup where I could monitor SG, PH, and temp. I also am looking for timer with a wave maker. Does anyone have any recommendations?