I cam to ask another question of the group and saw your question.... I too looked at the reef Pi, liked it but found that it also needed multiple boards. If your still looking for something with WiFi, perhaps this (AquariOS - Aquarium Operating System) would interest you. It was a bit too much for my needs, but I built one on a breadboard and it was a nice project, combining WiFi and a touch screen.I have been researching about iAqua and another diy aquarium controller , reef pi.
So far, it seems to me that reef pi has the features I want right out of the box, like WiFi connectivity and a website where it can be controlled from plus many modern features.
I hear that iAqua could do that also, but will need a lot of extra boards and more programming.
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I have an interesting fail safe mechanism for my heaters in stalled in my 6 tank central system....I was wondering if anyone has added control for a second heater relay, with or without on screen adjustability.
I'm using a SSR for the heater now, but would like to add a mechanical relay as a sort of fail safe, should the SSR fail (heard they fail closed circuit). This way, if the temp ever goes 2 or so degrees over the max set point, the mechanical would trip, saving me from a "fish fry".
I see in O2's board there are a few unused pins, and asking before I try adding code to utilize 1 of those.