Some more microcontroller-friendly pH sensors here -- https://atlas-scientific.com/ph/
Their datasheets are spectacularly well designed and clear! https://www.atlas-scientific.com/files/pH_EZO_Datasheet.pdf
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I love the formatting, pictures, and cautions. Good visual flow too. I'm a bit surprised it doesn't go into the technical aspects of what's going on with the transfer functions, which op-amps/ADC are used etc.
Aren't op amps sort of interchangeable here? Provided the correct temperature compensation, they all are highly linear, have a few MOhm input impedance, etc.
Same with ADCs; the signal in not particularly high-frequency.
What am I missing?
I've used those and they are fantastic and very easy to wire up!