[sdiy] Magnetic field

[harrybissell]

ahhh...

kill me now :^P

I'd probably go with an optical switch setup... because the "key down" point
could be
made totally unambiguous.  If you use a dual phototransistor, or analog sensing
you could get velocity as well.

But good luck, keep us informed. We like to bitch and tell you everything you
are
doing wrong.

Hey, its not a BBD or solderless breadboard, at least :^P

H^) harry

GothGeek SysAdmin wrote:

> On Sun, Aug 01, 2004 at 04:20:59PM -0700, Cynthia Webster wrote:
> > Ok, the suspense is killing me, so I'll wager a guess...
> >
> > Could it be a... Keyboard project?
>
> Yes.  You guessed it.
>
> I'm sick and tired of my Minimoog having a crappy keyboard.
>
> First thought was to just put microswitches on all the keys, but I was
> worried about the "feel" as far as when the keyboard would trigger so then I
> started thinking about Reed Switches which got me thinking that velocity
> would be neat which started me down the road towards magnetic field.
>
> I've got some tiny highly focused magnets.  Glue them on each bellcrank in
> the Pratt&Reed mech.  Sensor behind them although I suppose in front would
> work too, whichever is easier I guess.  Velocity is easy to calculate.  Then
> the hamsters in my head really spun the wheel up and I realise that if the
> sensor is sensative enough that I can get aftertouch *per key* by simply
> putting a rubber or felt strip under the key mechanism to get some hard
> resistance after stop.
>
> The end goal is to be able to do this to a pratt&reed mech in a completely
> reversable way so that you can get a worry-free no friggen corroded springs
> or 8000 moving parts action.
>
> Of course for this afternoon while pondering this ( and knowing that samples
> wont ship until at least tommorrow ) I'm going to polish each and every
> spring on my Mini.  That'll be fun.  I think for my encore I'll give myself
> a root canal and then step into AH with the declaration "DIGITAL IS BETTER"
> before setting myself on fire in the driveway.
>
> Oh, and I have to finish scanning something...
>
> --
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