Rather than start a new topic, I want to bump this post current and expand a bit if possible. I am also a newb, I have an UnoR3, with mega 2650 & ethernet shield being delivered, and I want to keep expanding my collection as long as it's heading in my desired direction. I am into indoor gardening and am hoping to one day build a "control every" device(s) that automates every electrical aspect of indoor gardening.
With that said, I am wanting to also purchase functioning EC(TDS) and pH shields/stamps, however, it appears there are only a small handful of manufacturers that make these, and the ones made will only monitor a single probe, albeit DIY probes or those on BNC connectors. My biggest concern is that I would have to buy a shield/stamp for each probe I buy or build and to think I will need an EC AND a pH probe for each of my 7+ reservoirs would financially break my back.
So before I get into all that, does anybody know if it is possible to build a circuit that a Mega 2650 (or Uno R3) can control a single shield or stamp that in turn could be fed a series of signals from probes in different solutions and still populate an accurate result to the serial monitor? I have a 750 watt ATX that I still need to mod, but I expect I will have more than adequate power for all devices that need some extra volts/amps.