[sdiy] Keyboard Encoder Experiments...

Paul Perry pfperry at melbpc.org.au
Tue Feb 12 00:36:37 CET 2008

Fortunately, we now live in the age of optic fibers.
Plenty of scope for the ingenious.

paul perry Melbourne Australia

-----Original Message-----
Hammond later on did something which involved a fixed emitter and sensor
(some had multiple sensors) and a movable shutter going in between them.
nifty part about this is that you can tailor the profile of that shutter so 
that it compensates for any inherent nonlinearity in the setup.  You can
control the aperture for both ends,  making a fairly narrow beam,  narrower 
than what the emitter puts out,  making any variances there go away,  too.

Stacking these in close proximity might be a hassle,  but if the key
a small lever that then moves the shutter you could stagger them on adjacent


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