Got display working on a Raspberry Pi with support for the adjustment knob. The adjustment character layout is still in need of work. This is on an 800x480 display; the intended display will be the same number of pixels (272x480) as the area painted here, but 4.3" diagonal, and very bright. Need to add serial connection via XBee and a prototype of sorts of the display device will be more or less ready. Then maybe back to working on the airdata probe!