[sdiy] Looking for a mini rotary encoder with very low torque (servo type)

[cheater cheater]

Using an optical mouse sensor vs an encoder sounds like absolute
hell... i wouldn't do it. optical sensors are really fickle.

you could also put small magnets in the wheel and pick them up with a
hall effect sensor, but that's way less good than even a self-printed
optical disk.

On Wed, Dec 11, 2024 at 4:59 PM Ben Stuyts via Synth-diy
<synth-diy at synth-diy.org> wrote:
>
> I believe even a lot of the USB mice have support for the old PS/2 protocol which is easy to decode (hence the almost empty adapter plugs from USB->PS/2 that you used to get with them). But I’d first check to see what kind of sensor is in there and try to attach to its SPI bus.
>
> Ben
>
> > On 11 Dec 2024, at 16:41, Jean-Pierre Desrochers <jpdesroc at oricom.ca> wrote:
> >
> > The surface I'm reading the moving speed of is paper.
> >
> > Yes, a mouse optical sensor could be Ok.
> > I will have to find a way to read the actual X-Y 'steps' on the inner micro though..
> > Just want one of these.
> > But I don't want to get into the USB protocol to find these X-Y values..
> > Your suggestion is very promissing..
> > Thanks.
> >
> >> -----Message d'origine-----
> >> De : Ben Stuyts <ben at stuyts.nl>
> >> Envoyé : 11 décembre 2024 10:30
> >> À : Jean-Pierre Desrochers <jpdesroc at oricom.ca>
> >> Cc : synth-diy at synth-diy.org
> >> Objet : Re: [sdiy] Looking for a mini rotary encoder with very low torque (servo
> >> type)
> >>
> >> I can’t help you with the encoder, but just an idea: can’t you use the sensor of
> >> an optical mouse? -> zero torque. Something like an ADNS-3050 although that
> >> one is obsolete now.
> >>
> >> Ben
> >>
> >>
> >>> On 11 Dec 2024, at 16:09, Jean-Pierre Desrochers via Synth-diy <synth-
> >> diy at synth-diy.org> wrote:
> >>>
> >>> I'm looking for a very small (20mm or less body diameter) rotary
> >>> encoder with very low torque (servo type).
> >>> The low torque shaft is needed because it will turn by means of a
> >>> small wheel with rubber sides that will be put against a moving surface, turn
> >> and 'follow'
> >>> the moving surface.. no slipping allowed !
> >>>
> >>> The precision of steps/turn is not important.
> >>> But the higher will be best..
> >>>
> >>> I was thinking of using a dismantled PC mouse (rubber ball type) and
> >>> use one of the two  X/Y optical rotary encoders, but these PC mice
> >>> nowadays are hard to find.. So.
> >>>
> >>> I checked Digikey and Mouser but they have encoder too big for my
> >>> uses..
> >>> The smaller I found has 20mm in diameter..
> >>> https://www.digikey.ca/en/products/detail/nidec-components-corporation
> >>> /RES20D-50-201-1/6469509
> >>>
> >>> Any suggestions ?
> >>>
> >>>
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>
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