That’s nice, I’m looking into it for hydroponics too. Atlas Scientific also creates good quality temperature probes and electric conductivity probes. All of them can be submerged, and depending on how you try to connect them they can be hooked to a single Tentacle T3 hat on top of a raspberry pi. It also exposes 2 inputs for I2C, one (or both) could be used to connect a peristaltic pump to mix your nutrient solution.
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