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

[Ben Stuyts]

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 one is obsolete now.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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> 
>