Yay!
This other problem sounds like a hardware issue, probably power or noise.
Schematic good start, CU wherever you decide to come for help if.
Even a hand drawn schematic, if complete, will do. Don’t get sidetracked wrangling any kinda schematic drawing tool and def no Fritzies, IMO.
a7
I have a vague recollection that PH detection requires amplification circuits and is very sensitive to any voltage drop, such as might be caused by running a pump, as you observe. If you want to fix it, it will need to be done electrically.
But I don't think you need to. Your code can read the PH and then decide what to do. While one of the motors is operating, ignore the PH reading. A little state machine may help.
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