There's an old DOS encoder simulation program kicking around on the Net.
It's called ENCODER.EXE, and it uses the PC printer port to output
simulated quadrature encoder signals. It should help establish accuracy and
response time for developmental encoder interfaces...

Mike Hardwick
Decade Engineering


>> Very true, and since the knobs will be as large as I reasonably can get
>away
>> with, that should slow them down a bit.  Whatever you believe to be
>> reasonable someone is bound to see how fast they can rotate the knob.
>> Knowing my luck they will probably try using an electric drill!
>
>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.

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