The DollyShield is an adaptation of the Arduino Motor Shield v3 that provides directional PWM control of two DC motors, at up to 1A of current each.  In addition to the motor drivers, it also provides a stereo plug with dual opto-coupled outputs for direct camera control, a 2x16 LCD, five user input buttons, and four auxilliary inputs or outputs through two stereo jacks.  It is designed to provide an inexpensive and easy-to-use interface for two-axis motion control integrated with a camera.

While the Timelapse Engine provides all the functionality needed to perform the motion control for your time-lapse video, you'll still need a way to interface with the engine. The engine can communicate with any computer that has a USB port, so we'll just need some software to tell it what to do. OpenMoco Slim is the first, and most basic interface to the time-lapse engine. It's a simple application that provides a low-profile way to interact with the engine and script complex sequences of motion in Windows, Linux, and OSX.

We'll cover how to get Slim up and running, and walk through the basics of using it.