Hi, here's a brief description of my OM project with a sample video.
The Nano Dolly can be retrofitted to a moco dolly using of the shelf NEMA 17 stepper motors . Using the OpenMoco Engine on Arduino basis and a Windows GUI or Perl Skripts, up to 4 axis can be controlled.
The control unit consists of a Pelican 1450 case with an Arduino 2009, L297/298 Motor drivers (lately I used Nanotec SMC11 wit great success). Redundant power supply connector allow to power the unit by battery or power supply (or both). The control software runs on Windows in a Virtual Box on a Macbook pro (lately I use an EEE PC).
All connectors are XLR.
The dolly runs on any standard tracks or pipes that can be fitted with a toothed belt. The track I use has 4 legs that allow to level the track up to 50 cm.