From peters@noeticdesign.com  Wed Aug  5 11:08:56 2009
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Date: Wed, 05 Aug 2009 11:08:52 -0700
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Subject: Re: [WheelWatcher] Maximum RPM for wheelwatcher
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Paul Jurczak wrote:
> I'm thinking about using wheelwatcher with quite fast motor, maybe several thousand RPM. What is the maximum RPM for wheelwatcher?
>   

The WheelWatcher encoder is not designed for high speed use; it is meant 
for use on a wheel, which implies low RPM.  We have not tested the upper 
limit on RPM. 

However, the response time of the optical sensor we use, the Sharp 
GP2S27T3, ranges from 20us to 100us, which puts a theoretical upper 
limit on RPM of 9375.

In the end, you are welcome to try it at high speed, but understand that 
we don't guarantee operation beyond a reasonable speed for a wheel on a 
small mobile robot -- usually not higher than a few hundred RPM.

-Pete