Denny's greenhouse has featured in Garden & Greenhouse magazine, as illustated here (reproduced with permission of the magazine)
Here's Denny's own description:
The control console with the SPLat controller is shown in the lower left
corner. The greenhouse is cooled with an evaporative cooler. The humidity in
the greenhouse ranges from 30% to 70%, and the temperature from 45°F to 90°F,
though on occasion - when the evaporative cooler blower motor trips out - the
temperature has gotten up to 110°F. This doesn't seem to effect the SPLat controller,
but it's tough on the plants.
As you see, the photo below shows the inside of the box. I'm not a electronics' guy and I'm a self taught GW-Basic and Visual Basic, and now, SPLat programmer??. I only learn as much as I need to get the job done, so my circuits and the associated equipment design and control programs are at best, very basic, as in not elegant, but they get the job done.
FYI, I've had excellent support from Fred Pacilli at Integrity Engineering Services, SPLat's USA rep. He's been very helpful.