Wawa.
This one appears to have opto-isolation, and is very inexpensive.
With x2 of these, I can quickly control 32 devices+
Pairing this up with my Mega, Pi3+, and my sensors, should provide me with the intended platform.
While being wireless, expandable, and capable of running an internal web page / database to log and chart the data into my dashboard.
That can then be PHP, HTML, Java. As far as I understand it.
But I Will likely pay someone to write the dashboard portion.
All I need to learn will be the IDE/Python.
Its a task, but I need this unit, and I can only get exactly what I need here If I make it myself.
I'm still thinking that a PI and Arduino Mega are the way to go.
I understand what Nick is saying about a lot of smaller sensor specific devices.
But that leads me to being the only one who can really work on or troubleshoot the system.
If its centralized, I can teach my employees how to identify most common failures, and there is really only one place to look for them. In the control box.
Or if a sensor is triggering there, and simply not working, then there is only one other thing it can be... The sensor itself.
This will make troubleshooting VERY simple.
Now there is only ONE wireless connect per Greenhouse, one IP, one Mainboard, one Relay Center, one Control box, etc.
Reducing the troubleshooting variables and simplifying the configuration is highly desirable in my circumstance.
Thank you both for your input though.
All of this has been very valuable.
Pi3+ Mega is still winning so far.
