The "production" version of the Arduino shield stack used to run the camera dolly.

In order to fit in a reasonable sized box, I combined five functions into one: the limit switches from the dolly, the camera interface, the button interface for controlling the electronics, the interface for the display, and a piezo beeper.

After taking this picture, I ended up having to rewire the optoisolators (middle top) and troubleshoot a crossed wire in the display header (lower left), and added the headers in the upper right for the lines to the camera remote and limit switch panel jacks. Not bad. I was expecting more than two screwups, and it was really only one (the display header) when you consider all the inexplicable trouble I've had with optoisolators - I figured those would turn out to be wired wrong no matter what I did, and I was right.

Now to build the box, and finish the software.