A cat exercise tracking app ?
A board game?
A deck for your patio ?
The goal isn't profit, although that would be nice. God knows making a profitable software is nearly impossible.
I have a lots of the parts I need, especially for the monitoring, but this iteration of the greenhouse required removing a lot of it, and it hasn’t been set back up.
As a thought experiment I often wonder if it's practical for a person to grow enough food to sustain themselves assuming you had enough fertilizer or other needed inputs.
The greenhouse supports many other things, growing 100% of our food isn’t a goal, but supporting our food and having seasonal abundance to sell or give to neighbors is. We start more than we can use, and surplus in seasons is the goal.