In this previous post I mentioned that part of rewriting the Sensor Module was to remove bloated code that isn't used any more. Because for the most part, I'm learning as I go, sometimes I discover something that I just have to include.
I'm afraid that may never end...
It's a 0.96" OLED screen, and it plugs right into the I2C buss, runs on 5v, and contrary to the poor quality of the picture, the screen is extremely easy to read under any light conditions. It was under $3 at AliExpress, I grabbed two, but will be grabbing more now that I see how easy they are to use.
I haven't figured out what I need it for yet, just that I need it :)