After a long break doing HG & RPi projects, as my HG systems at home have been working flawlessly for the last couple of years, I decided to replace my broken swimming pool controller with a home made HG solution. It was fun to do designing, building and programming again
I build a split system, with all the high voltage stuff in one box and all the low voltage stuff in another box. The two are electrical separated by optical isolated relays.
It is still a work in progress. The low voltage side will get a second board with 6 relays, and a 8 channel AD converter for analog sensors. hence that big bundle of wires sitting there patiently waiting for the additional hardware to arrive.
Behind the RPi are the 5, 12 and 24 volt power supplies.
I use 1wire temperature sensors for the various temperature measurements which drive the solar heater.
First picture is the high voltage part of the controller I build, controlling pool pump, spa blower etc.
Second picture is the RPi controller with relay board etc, controlling the water valves, temperature sensors and the high voltage relays.
Third picture is a screenshot of one of my HG control screens.