Variometer (cockpit instrument)

Variometer with mechanical needle and LCD for use with [Openvario](http://www.openvario.org/). Can also be used for simulators. Work in progress.

This is a standard 60x60mm instrument (57mm diameter hole). Its designed around the [x27.168](https://www.adafruit.com/product/2424) automotive gauge stepper motor, a rotary encoder (Keyes 040 for now) and one of these two displays:
- [1.3" SHARP Memory LCD](https://learn.adafruit.com/adafruit-sharp-memory-display-breakout).
- [1.54" Waveshare