A fraction over a year since your post here, and I'm about one week away from going live with the first official, non-beta release of App::RPi::EnvUI distribution with full pictorial POD and everything that I spoke of in your mentioned thread. I've been using my grow room environment controller in a production (albeit a "test", six plant) grow room for some time now.

It's been quite a ride. For the RasPi, I have an extremely rigorous, custom-designed and written Continuous Integration testing platform I run on a 24x7 basis, and is triggered any time I make a commit that affects change to any related distribution, with a detailed breadboard layout for replicating the hardware aspect of the testing platform.

I've got a PCB on order for the test platform so that I can just solder all the stuff together without having to utilize the space two breadboards take up, and the harsh errors that can happen over time when wires become loose. That went through about six different prototypes using typical perforated PCBs for testing.

Here's the absolute latest code (on Github) for the original reason I started down this path. There are a few handfuls of issues most of which are "enhancements". All of the show-stopper ones have been fixed. My CPAN release of v1.00 has not happened yet as this next release primarily is focused on rendering a proper POD layout (which I haven't started yet as I've corrected some other issues).

Again, about a week and the first version that I am confident won't burn down anybody's house, nor render grow lamps to turn on at an incorrect time has been achieved. (Note: I do have Residential and Commercial qualifications for the 120/240v electrical stuff, so if you don't, you'll want to get professional advice. The documentation will have physical set-up pics of one of my prototypes, with clear warnings about the dangers of live-electrical yada-yada)