Hey Vanz,
Puratek has some of these features, the GFCI is unique I believe to all of them.
One other thing I would like to see, ALLOT of inputs. They are cheap, a 10 dollar arduino board has 16 inputs for example. I like allot of leak sensors, dual and triple float switches, float switches in the overflow (detect clogged overflows), etc. By having so few on APEX it is limiting and I have to spend allot more than 10 bucks to get more inputs.
Flow sensor would be nice (return pump says it is on, but flow is 0, sensor or return pump is bad go investigate).
More and more controllers are showing up with some form of par meters, that is a huge plus even if not 100% practical.
There are a ton of musts, like PWM output to control LEDs and powerheads, basic timer functionality, moon phase tracking, temperature table tracking. Man the list goes on and on.
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Here are some more niche case ones, that are still interesting if only to me.
Integration with home automation outlets like Z-wave etc. These outlets are already controllable and have been on the market for years.
Third party integration. If I have an network enabled power strip, it would be awesome to be able to integrate with it.
Wireless power strip integration. 10 dollars for three outlets of control. I use one on the frag tank to control the powerheads with a FOB.
Allot of these features are heavy overlap with home automation. Reef controllers and home automation do overlap quite a bit. The IOT initiatives will some day be able to do what reef controllers do and vice versa. Playing into an IOT framework is also appealing. Something like Contiki or Spark, etc...
Well I said it was niche right?
Hope that helps keep the conversation going. Cannot wait to hear your opinion when you get one of these.