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Topic: Potentiometer with Continuous Rotation (Read 8 times) previous topic - next topic

beardedkid

Alright,
I am working on a really fun project. I'm putting a potentiometer inside of a See 'n Say and using the readings to change the audio output. But the arrow on the device only spins in one direction, so in order to do this I need to find a pot with a full, continuous 360 degree range of motion.
Does anyone know where the best place to find one is?

mowcius

So do you mean 360deg or continuous or multi-turn?

You can get multi turn potentiometers which will do say 4 turns or so or if you want continuous, you are looking for a rotary encoder.

Mowcius

Grumpy_Mike

You can get continuous rotation pots, these are designed for use in servos and are quite pricey.
A typical example is:-
http://uk.rs-online.com/web/search/searchBrowseAction.html?method=getProduct&R=2943690

beardedkid

Thanks,
I'll check out the rotary encoder and try modifying one of my pots.
Appreciate the input.

CrossRoads

There are these at digikey, 74 cents, 360 rotation. Supply your own shaft.
Designing & building electrical circuits for over 25 years. Check out the ATMega1284P based Bobuino and other '328P & '1284P creations & offerings at  www.crossroadsfencing.com/BobuinoRev17.
Arduino for Teens available at Amazon.com.

CrossRoads

Guess the link would have been good:
http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail&name=P12426TR-ND

Search for potentiometer, filter on continuous
Designing & building electrical circuits for over 25 years. Check out the ATMega1284P based Bobuino and other '328P & '1284P creations & offerings at  www.crossroadsfencing.com/BobuinoRev17.
Arduino for Teens available at Amazon.com.

afclewis

If you are looking for a "cheap" small shaft encoder have a look at http://www.usdigital.com/products/ma3/ if you're in europe and your german is passable (or use chrome and translate feature) you can order online from the german site, or just give them a call in the USA or send a fax ( i know, who thought people still use fax'es).

Hope this helps

CrossRoads

#7
Feb 09, 2011, 10:14 am Last Edit: Feb 09, 2011, 10:21 am by CrossRoads Reason: 1
$40! Hardly seems 'cheap'!
I think I'd give the 74 cents approach a shot first :)

Ok, I tried to order to confirm price,
need a slightly different part number, $2.06 each.

http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail&name=P12426CT-ND

Only has 330 degree of resistance coverage, put two back to back arranged so that their  0 +/- 14 locations didn't overlap.
Designing & building electrical circuits for over 25 years. Check out the ATMega1284P based Bobuino and other '328P & '1284P creations & offerings at  www.crossroadsfencing.com/BobuinoRev17.
Arduino for Teens available at Amazon.com.

Minkowski

Really low-budget scrounge. Got an old-style mechanical mouse in the junk box? Two rotary encoders and a couple switches for free. If you're lucky the parts can be removed from the housing for re-use. Might have to remove crud.

afclewis

Quote
$40! Hardly seems 'cheap'!


Notice "cheap" with quotation's either side!!! It was supposed to imply that it is relatively cheap!! Not cheap full stop.......

westfw

If you can live with a mechanical rotary encoder:

http://www.bgmicro.com/pushbuttonmechanicalrotaryencoder.aspx
http://www.allelectronics.com/make-a-store/item/REC-3/ROTARY-ENCODER/1.html
http://www.goldmine-elec-products.com/prodinfo.asp?number=G16267
http://www.sureelectronics.net/goods.php?id=221

Or even modern mice usually have an encoder for the "wheel" portion.

Also, there are ways to use a stepper motor as an encoder...

Folderol

Farnell group are pretty world-wide these days
This is just under 6ukp and is 15ppr (30 if you matrix the A&B channels).

http://uk.farnell.com/alps/ec11j1520801/encoder-rotary-30ppr/dp/1656445

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