On Sun, 20 Mar 2011 18:52:24 +0000 andy baxter <andy@xxxxxxxxxxxxxxxxxxxxxxxxxxx> wrote: <snip> > The only thing I found problematic in his design wasn't to do with > usability but the expense (and also physical bulk) of having to use a > high end audio interface as part of the electronics. This put me off > building one myself, so I am thinking of having a go at a very similar > design but using a resistive rather than capacitive pressure sensing > technique. I.e. basically the same design but using a sheet of carbon or > metal loaded conductive rubber and measuring the resistance changes when > you scan through the matrix. If this works, it will hopefully produce > similar results but with much simpler electronics and firmware. > > andy This is vastly overcomplicated. Once you understand the concept itself (which really is good), a set of dedicated oscillators and detectors (tuned amplifiers+A/D converters) would by much simpler, smaller and reliable. I would then be inclined to try to embed the electronics in the device itself, and bump up the operating frequency as much a possible to improve the response time of the detectors. -- Will J Godfrey http://www.musically.me.uk Say you have a poem and I have a tune. Exchange them and we can both have a poem, a tune, and a song. _______________________________________________ Linux-audio-user mailing list Linux-audio-user@xxxxxxxxxxxxxxxxxxxx http://lists.linuxaudio.org/listinfo/linux-audio-user
