Precisely control my amature telescope's right ascension axis so that (when the telescope is polar aligned) it counteracts the rotation of the Earth, allowing me to take long (>~7s) exposure pictures of planets and deep sky objects (clusters & nebulae). I have an "EQ-2" mount.
It controls the rotation rate of the right-ascenction axis to counteract the Earth's rotation. I use a servo to do this a...
Telescope OnStep goto controller - Arduino MEGA 2560 board
More info about OnStep goto controller on [Howard Dutton project](http://www.stellarjourney.com/index.php?r=site/equipment_onstep) or [OnStep News](https://groups.io/g/onstep)
For box see https://www.thingiverse.com/thing:2748375
#####Another recommended link:
* [My OnStep ST4 Handheld controller](https://www.thingiverse.com/thing:26...