Introduction
Two important parameters to monitor in an aquaponics system are the water temperature of the fish tank and the root temperature of plants in the grow beds. In fact, soil temperature is far more important than air temperature when it comes to a plant's ability to grow and uptake nutrients. By monitoring both the stock tank temperature (origin) and the grow bed temperature (destination) you can see the thermal efficiency of your plumbing system or connect it to a relay to create your own water temperature controller. A great sensor for monitoring temperature in liquid environments is the waterproof DS18B20 and it's very easy to connect to an Arduino.
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