- Extron boxes use this thing called "SSI", or "Server Side Includes", to generate the data I need. It's actually rather well-documented, despite it only being a couple pages worth of information. See the manual, starting about halfway down page 4-19.
- A Bash/wget script takes all of that data, and dumps it into one big file.
Now, you might be wondering why I didn't use "real" AJAX, or push from the server, or do it this way or that way. The answer is simple: I'm not that smart yet. I'd love to, and I welcome suggestions. I just wanted to make it work for now, and I'll figure out how to improve it later.
At a glance, this gives us the following information:
- What projector it is
- Whether that projector is on, off, or something else ("cooling down", "error", etc.)
- How many hours are on each lamp. (Most professional-grade projectors have some sort of monitoring of "lamp hours", as a lifespan/life-remaining indicator.)
- A colorful dot that summarized the status (green = on, red = off, other colors = other things).
Edit: Most of the bugs have been sorted, and I think it's as good as it's going to get. (2016-10-15)
As is typical for me, the code is all on Github. See the notes file if you want a more in-depth look at how everything fits together.