OnStep for Seben EQ3 mount

Adapting [SEBEN EQ3 telescope mount](https://www.ebay.com/itm/Seben-EQ3-telescope-mount-including-aluminium-tripod-/380453559697?nordt=true&rt=nc&orig_cvip=true) or similar types to [OnStep goto controller](https://groups.io/g/onstep/wiki/home), by Howard Dutton project.

How to this working? See my video: https://youtu.be/mOXqw7EN8YE

* [My OnStep Controller Box](https://www.thingiverse.com/thing:4057270) on base STM32 Blue Pill
* [Alternative OnStep Cotroller Box](https://www.thingiverse.com/thing:3404139) on base MiniPCB2 and Teensy3.2
* [Old OnStep Controller Box](https://www.thingiverse.com/thing:2748375) for on Arduino Mega2560 board


* FreeCAD sources on [Github](https://github.com/romanhujer/OnStep-for-Seben-EQ3-mount)

####Version 1.0 - 3D printed gears 54:16

* 1x RA motor is [17HS15-1684S-PG5](https://www.ebay.com/itm/Extruder-Gear-Stepper-Ratio-3-7-1-Planetary-Gearbox-Nema-17-Step/292645105771) with Gear Rate 3.7:1 (1+46/17) :1
* 1x DEC motor is