Did a little work on the etch a sketch device at Work in Progress night at Foulab yesterday. Nothing amazing to report, but was able to observe more clearly the strange backlash problems that it has. The following pic shows a square wave of 100 steps up, and 50 steps over, followed by one back moving -100 steps in y and -50 in x each time. It should produce a nice level series of even rectangles. Obviously it does not - theres a lot of drift. At least some of the drift seems to be hysteresis in the movement, and it may also be skipping a step occasionally, especially the vertical axis.
Well, such is the nature of work in progress.