[sdiy] sin/cos pot

[Rick Jansen]

Very useful! Thanks for this, I had never seen it before.

rick

> On 10 Jul 2017, at 13:12, Ullrich Peter <Peter.Ullrich at kapsch.net> wrote:
> 
> Hi!
>  
> Maybe the Bourns ACE Encoder could fit here: absolute encoder, 128 states per revolution, no hard steps
> https://www.bourns.com/pdfs/ace.pdf
>  
> about 5pounds
> http://uk.farnell.com/bourns/eaw0j-b24-ae0128l/encoder-rotary-128pos-8-bit/dp/9358234
>  
> Youtube:
> https://www.youtube.com/watch?v=MrPW8QGmlrM
>  
> https://www.youtube.com/watch?v=44-XMo730wI
>  
>  
> Ciao
> Peter
>  
> http://www.ullrich.at.tt       (My homepage)
> http://synpro.heimat.eu/datadial.htm   (Synth addon)
> http://rc100-usb.at.tt/    (Roland sampler tool)
>  
>  
>  
> Von: Synth-diy [mailto:synth-diy-bounces at synth-diy.org] Im Auftrag von paula at synth.net
> Gesendet: Montag, 10. Juli 2017 12:51
> An: Julian Schmidt <elfenjunge at gmx.net>
> Cc: synth-diy at synth-diy.org
> Betreff: Re: [sdiy] sin/cos pot
>  
> Issues I see with a sin/cos pot;
> 
> Use of 2 x ADC channels (more expensive than logic inputs)
> 
> Slightly more complex software for reading/processing the sin/cos outputs.
> 
> Advantge; you get an absolute position.
> 
>  
> 
> if you want more resolution from a regular grey code rotary encoder. you can use double edge triggering.
> 
> So instead of just picking the rising edge on one channel, use both edges, this will give you 48PPQN with a 24PPQN encoder.
> 
> I guess, though not tested, you could go a step further and use edge detection on both channels and both edges on both channels giving you 96PPQN from a 24PPQN encoder, though I would expect switch bounce to cause more of a problem at this resolution.
> 
> Downside; no absolute position.
> 
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> 
> Paula
> 
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> On 2017-07-10 11:31, Julian Schmidt wrote:
> 
> I also found them at www.adimpex.it for 1.15€/pcs. but they have a minimum order amount of 200€ :-/
> still looking for a better sample source.
> 
> Am 10.07.2017 um 12:09 schrieb Michael Zacherl:
> On 9.Jul 2017, at 12:42 , Julian Schmidt <elfenjunge at gmx.net> wrote:
>  
> Anybody has an idea what the part number for the continuous alpha pots is?
> I just asked the other day for an encoder alternative with higher resolution, they would be great!
> Maybe I'd have to ask my distributor in taiwan about them.
> Thanks for sharing, didn't know such a pot exists.
> How would you tell the direction of the movement?
>  
> BTW, $15 ... hm ... needs quantities I'd guess ... 
> https://www.aliexpress.com/item/1pcs-ALPHA-RV112FF-40B3N-22F-0B10K-Encoder-360-degree-turn-gain-potentiometer/32751858615.html
>  
> Thanks, Michael.
>  
>  
>  
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