Eggbot/Spherebot/polargraph Controller

This is a dual stepper motor controller board that takes two stepstick style stepper modules (DRV8825 or a4988 or similar) and an Arduino Nano.

See http://www.thingiverse.com/thing:1393222 for a PCB mount.

It can be used as the controller for a polargraph or Eggbot/Spherebot or some other drawing machine with the appropriate firmware loaded onto the Arduino Nano.

Yeah, I know, not really printable, but if you have a CNC router or a router setup on your 3d printer, you might be able to make this. If you do, i'd really like to see the end results!

The idea behind this was to make a small, cheap and versatile controller to replace an Arduino Uno and stepper shield (or a bread board) and could be used on more than one drawing robot. With Arduino Nano clones and stepper driver modules available on ebay for less than £2 each, and excellent low cost PCB prototyping services like iTead Studios, it should be possible to build this for ~ £10 each. Note: The other components came fro