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'You mean: *OT*: ARGH! Rotary pulse encoders'
1998\07\24@175152 by Peter L. Peres

picon face
 I can see no relation with my previous message, but you seem to be
desperate, so I'll try:

On Fri, 24 Jul 1998, Timothy D. Gray wrote:

> Ok here's a trick I have a rotary encoder (WEll I very loosely call it an
> encoder) it's a knob that when spun one way it produces pulses on pin 1
> with respect to it's source, spin it the other way and you get pulses out
> the other pin..

Is that by chance a homebuilt device ;) Because if it is, throw out the
contacts and use optos instead. With the 2 outputs fed to Schmitt-Triggers
you will never miss a beat again. Guaranteed.

> Here's the problem: the pulses are nasty and full of
> bounces, debouncing the output will not work as a fast turn will only
> react as a single step, I.E. the fast train of pulses get debounced to
> /dev/null in the PIC world. are there better rotational pulse user input
> devices available or are they all plagued by the debouncing problem?

I see a lot of subminiature rotary encoders in my repair work, some of
them done using very funky plastic technologies I wouldn't trust in a 3rd
class science fair project for 5 minutes, but none ever has, had or will
have a glitch problem.

The best input devices available cheaply for hobbyists imho, are cheap
mice. You get two good rotary encoders and most required hardware for $10,
and, if you need it, a well known protocol and interface to RS232 ;)

Peter

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