James Henke wrote:

> But don't forget that if you're pulsing the LEDs in a quadrature
> encoder, you must sample the output fast enough to satisfy the Nyquist
> criteria, in synchrony with the led pulsing.  What's the maximum RPM x
> counts per revolution? Sample at LEAST that fast, and preferably much
> faster.

  Hey!  Do I gather he's being very clever here and multiplexing the
quadrature encoder by pulsing the LEDs?  Cool idea!

  Cheers,
        Paul B.