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

[Vladimir Pantelic]

also check out the AMS magnetic rotary sensors, then all you need is to 
stick a small magnet to the rotating part:

https://ams-osram.com/search?productSearch=true&filter_products=position-sensors

On 11.12.24 16:30, Ben Stuyts via Synth-diy wrote:
> 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 Something like an ADNS-3050 although that one is obsolete now.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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