Using a text-lcd to draw a graph...

The first discontinuity is maybe a math bug... The second is just random leftover from old code. In all, this might could work.

Of course, the HD44780 only has 8 custom characters, but A) technically, that's all I need to plot 8 data-points, and B) I've a few ideas to squeeze more outta it if I need to.

For this proof-of-concept, though, I'm quite pleased with how it looks. I was somewhat-concerned it would be too sparse to recognize as a graph, or that it would be hard to see. Not bad at all!