Thats an interesting project your doing. Im working on a similar arduino project. Currently I have the arduino controlling the temp of my tank, turning my diy leds on/off, with high temp failsafes, turn pumps off for a feed mode and run a ph meter with auto calibration built in.
In the future im looking at making some random flows with solenoids on my closed loop pump.
I love the versatility of these controllers.
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