Today we tested out the [ SainSmart Joystick ]. It works. What do I need it for? For demoing the ezDSP. The idea is to change parameters / swap filters through a joystick. This seems like a good application because I would get to use the SAR ADCs, change filter weights in real-time, convolve, and output some interesting audio!
So today was the joystick check. The best part was using caps to smoothen out the transitions between different levels output by the joystick’s pots. I felt really good, because I finally realized that a cheap way to implement an interpolation function is to go analog – throw in a cap (with bigger caps giving longer, smoother transitions.) Well, its an exponential interpolation, but if you are interested in a specific polynomial interp, couldn’t that be expressed as a combination of exponentials? Probably, as polynomials do have Fourier transforms 🙂
For the filtering application I am thinking, I would rather like a smoother transition between different states, so I tried different caps out.
A gotcha to be careful about is the scope’s probe. It has two modes 1x, and 10x. My understanding is that the 10x mode offers 1/10th the actual voltage readings. I have been using the 1x mode, but I’d like to see where 10x might come in handy.