[sdiy] Polyphonic touch panels? Capacitive relaxation osc method?

[Michael Zacherl.]

maybe this inspires you:   http://madronalabs.com/DIY

Michael.

On 15.9.2011, at 21:17 , KD KD wrote:

> Is it possible to use capacitive sensing on 8x8mm PCB pads and the
> relaxation oscillator
> method for 80 touch buttons on a grid of 10x10mm? I haven't done any
> calculations on this
> but estimate the osc need to buzz around a 1-1.5Mhz due to distances
> between buttons.
> Or must the pads be larger,and further spaced away from each other? I
> tough i could
> anding them together to save I/O ports. I have some various papers on
> the subject
> but none speaks about very short distances.
> 
> Ideas?
> KD
> 
> ( Thank's for the previous info, Veronica, Collin.)



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