[sdiy] distance meter for keyboard, was: Where to get special white keys?

[cheater cheater]

Ingo, I was trying to find the Ensoniq patent for poly aftertouch but
failed. Are you able to find it?

Cheers
D.

On Sun, Mar 1, 2009 at 1:35 PM, cheater cheater <cheater00 at gmail.com> wrote:
> And patented.
> I know you can use patented things for DIY, though.
>
> What about optical sensors?
>
> D.
>
> On Sun, Mar 1, 2009 at 9:59 AM, Ingo Debus <igg.debus at t-online.de> wrote:
>>
>> Am 28.02.2009 um 21:24 schrieb cheater cheater:
>>
>>> Then the next very difficult thing to do would be
>>> to figure out the distance meter for the key: I would probably go for
>>> something optical, and this assembly could be quite difficult, and
>>> parts hard to source.
>>
>> Or you could use an analog (linear) hall sensor and a small magnet. This
>> should not be too expensive, and easy to build.
>>
>> Ingo
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>