[chbot] Fixing bouncing rotary encoder

[Charles Manning]

A capacitor across the contacts might help.

What is the value of the pull up resistor? How often do you expect to see
pulses (if it was clean)?

Set the capacitor so that the RxC = about 1/10 of the period of the nominal
"clean" frequency you want.

Alternatively, if you have a scope handy and can see the glitches, set the
value to about 5 x the period of the glitches.

That should give you a reasonable starting point.


Rotary encoders should be doing quadrature encoding. I've seen that messed
up in firmware at least 50% of the time.

On Sun, Nov 6, 2016 at 5:44 PM, Volker Kuhlmann <list0570 at paradise.net.nz>
wrote:

> I have a digital power supply that has developed a bounce problem with
> its twiddle knob, making it pretty much unusable. Someone at the last
> meeting mentioned the quick fix is to put in a capacitor, but I don't
> remember the details. Is the capacitor across the contacts? And what
> value? 100pF? 100nF? Wouldn't burn 100nF the contacts out?
>
> Obviously this tool has s... firmware, but I can't fix that. Plan B is
> to try and replace the encoder, but if a quick fix works that'll save
> some headaches with models, sizes, etc.
>
> Thanks muchly,
>
> Volker
>
> --
> Volker Kuhlmann
> http://volker.top.geek.nz/      Please do not CC list postings to me.
>
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