> -----Original Message-----
> From: pic microcontroller discussion list
> [mailto:PICLIST@MITVMA.MIT.EDU]On Behalf Of Jeff DeMaagd
> Sent: Sunday, October 21, 2001 12:52 AM
> To: PICLIST@MITVMA.MIT.EDU
> Subject: Re: [PIC]: Rotary Encoders
>
> Actually I have used an air drill to test the maximum speed on my own
> projects.   On a 4MHz PIC I have managed to be able to use
> polling to detect
> around 50kHz speed on a quadrature encoder, but that is running full bore
> and doing nothing else other than increment/decrement the counter and
> measuring the velocity.
>
> I don't think you are in any real trouble on a user interface, even if you
> have to worry about bounces, which I did not have to with an optical
> encoder.
>

I don't think a contacting type of encoder would last very long at that rate
anyway!

David

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