[sdiy] sin/cos pot

[David G Dixon]

Ditto!  My mind is reeling with uses for these cool pots.


  _____  

From: Synth-diy [mailto:synth-diy-bounces at synth-diy.org] On Behalf Of Rick Jansen
Sent: Monday, July 10, 2017 6:50 AM
To: Ullrich Peter
Cc: synth-diy at synth-diy.org
Subject: Re: [sdiy] sin/cos pot


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.



Paula













On 2017-07-10 11:31, Julian Schmidt wrote:

I also found them at www.adimpex.it <http://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  <mailto:elfenjunge at gmx.net> <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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