You are killing itI have got the following working and Tested ..
1. 8 channel relay Mains side GFCI between house and Outlets . Logic side uln2803 between relay and Pi .. Powered with its own 5v power supply.
2. DS 18B Temp sensor . controller Heater and Cooling outlet
3.Analog Float switch . Controlling a ATO Outlet
4.Adafruit pca 9685 Running led lights thru msfets irf520 testing with high power rgb led powered by 10v ps
5. running 3 12 v fans thru a second on pca 9685 powered by 12v ps to test a second light channel of 3 devices
6 . 4 port dosing pumps running thru pca9685 with a uln2830 between dosing pumps and pca9685
the only thing being powered thru the pi is the pi itself.
The dosing pump outlets. and a few other things will be broke out into separate boxes . Next step i think.
Here is the mess