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'[EE] Need a rotary encoder'
2004\09\01@031747 by Denny Esterline

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I was hoping to use a rotary encoder for user interface on my next project,
typical 'frob knob'. The encoding or the number of pulses / rev isn't
really important - I can fix that in software :-) But I was hoping for
panel mount and with the extra 'push' switch. (i.e. scroll and select) The
PCB will be several inches away on wires.

I'll only need a few.

Anybody have any favorite parts or sources?

Thanks
-Denny


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2004\09\01@043549 by cdb

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Dick Smith Electronics in Oz/NZ happen to have the Piher C-11 rotary
encoder with integral push button - they are selling them off and they
have them at a ridiculous price.

http://www.dse.com.au

Rapid in the UK did have some, but they have n horrendous penalty for
non EU orders

Also Digikey used to have the Piher ones

http://www.rapidelectronics.co.uk

http://www.digikey.com

Colin

--
cdb, spam_OUTbodgy1TakeThisOuTspamoptusnet.com.au on Wednesday,1 September,2004

I have always been a few Dendrites short of an Axon and believe me it
shows.

Light travels faster than sound. That's why some people appear bright
until they speak!



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2004\09\01@044142 by Wouter van Ooijen

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> I was hoping to use a rotary encoder for user interface on my
> next project,
> typical 'frob knob'.

http://www.voti.nl/shop/catalog.html?M-SW-ROT

sorry, no push-switch on it.

Wouter van Ooijen

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Van Ooijen Technische Informatica: http://www.voti.nl
consultancy, development, PICmicro products


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2004\09\01@062511 by Wouter van Ooijen

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> Dick Smith Electronics in Oz/NZ happen to have the Piher C-11 rotary
> encoder with integral push button - they are selling them off
> and they have them at a ridiculous price.
> http://www.dse.com.au

Where do they hide them on their site? 'piher' or 'c-11' turns up a
blank.

Wouter van Ooijen

-- -------------------------------------------
Van Ooijen Technische Informatica: http://www.voti.nl
consultancy, development, PICmicro products


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2004\09\01@064759 by Jinx

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> Dick Smith Electronics in Oz/NZ happen to have the Piher
> C-11 rotary encoder with integral push button
>
> http://www.dse.com.au

For some reason it's viewable at http://www.dse.co.nz but not Oz

(Interesting that Oz has 6187 items on-line, NZ 13249  ??????)

Part # P7531, NZ$5.01 (US$3.30). This seems very low
compared to most if not all encoder prices at Digikey and RS

Thanks for the tip

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2004\09\01@065329 by cdb

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:: Where do they hide them on their site? 'piher' or 'c-11' turns up a
:: blank.

Ahh maybe they have now run out, I bought 2 back in January for 95c
each about 35 pence.

Colin

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2004\09\01@073442 by Wouter van Ooijen

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> Part # P7531, NZ$5.01 (US$3.30). This seems very low
> compared to most if not all encoder prices at Digikey and RS

Probably, but much to high for me to consider adding to my shop, I sell
a non-switch RE for $1 :)

Wouter van Ooijen

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Van Ooijen Technische Informatica: http://www.voti.nl
consultancy, development, PICmicro products


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2004\09\01@081717 by Russell McMahon

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> Part # P7531, NZ$5.01 (US$3.30). This seems very low
> compared to most if not all encoder prices at Digikey and RS

Available at many stores still so may not be an end line product.

       RM
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2004\09\01@082808 by John J. McDonough

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----- Original Message -----
From: "Jinx" <.....joecolquittKILLspamspam@spam@clear.net.nz>
Subject: Re: [EE] Need a rotary encoder


> Part # P7531, NZ$5.01 (US$3.30). This seems very low
> compared to most if not all encoder prices at Digikey and RS

DigiKey has some Panasonic encoders for under a buck.  Most of the
mechanical encoders are under three bucks.  There is a huge range of price
and features at DigiKey.  Opticals are quite a bit more expensive.  I think
Craig Johnson, AA0ZZ, may still have some of the nice Clarostat opticals on
his web site for about 15.

One thing to watch out for, depending on your app.  Most of the low priced
mechanical encoders have detents which vary from fairly soft to downright
annoying.  No two manufacturers seem to use the same units for describing
the detents, so you have no idea what a particular encoder will feel like
until you get your hands on it.  The Panasonic encoders tend to have a very
soft detent which, on some models, does feel quite nice.  On others it feels
sloppy.  The Grayhills tend to have a very positive, and loud, click, which
I personally find quite annoying.  The relationship between the gray code
and the detents is not always obvious from the catalog.  Generally, if the
detents line up with the gray code you can deal with it in software.  On
some of the Panasonic models, the pulse is actualy stretched a bit at the
detent to ensure that each detent has the same code.  On the flip side, the
contact bounce spec on some of the Panasonics is awful.  However, on some
encoders, the pulses aren't integrally related to the detents.  Depending on
the app, these can be very hard to use.

(I happens I am currently writing the Elmer 160 lesson on encoders so I've
been doing a bit of research!)

--McD


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2004\09\01@085057 by Jinx

face picon face
> > Part # P7531, NZ$5.01 (US$3.30). This seems very low
> > compared to most if not all encoder prices at Digikey and RS
>
> DigiKey has some Panasonic encoders for under a buck.  Most of the
> mechanical encoders are under three bucks.  There is a huge range of
> price and features at DigiKey.  Opticals are quite a bit more expensive

At a second look I see you're right. 32ppr opticals are 20-40 USD,
mechanicals are quite a lot cheaper and $3.30 is in the normal range for
low ppr. It's slightly cheaper than Mouser

I think if the price had still been 95c I'd have got a few and kept them
aside for an opportunity. If $5.01 is normal retail then I'd not look for
an excuse to buy them

Thanks for the advice re detents

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2004\09\01@161201 by Martin McCormick

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       One source of rotary encoders designed to be manually turned
is found in cast-off, but modern, car radios.

       After a shop accidentally killed our car radio by, I think,
hooking the battery up backwards, I took the now totally dead old
radio and found that the volume encoder was a discrete assembly held
on mechanically with a threaded collar just like a pot.  The detents
are about 32 or so per revolution.  When I unsoldered it from the
board and removed the nut, it came out easily.  A continuity check
showed that the Gray code repeats every two clicks.  On one click,
both the A and B phases are open with respect to the Common terminal.
On the next click, depending upon which direction one is turning it,
both A and B phases short simultaneously to common and then open at
slightly different times on the next click.  If one rotates the knob
in the opposite direction, both phases make at slightly different
times and break simultaneously.  The push switch in the knob is a
momentary on type switch.  In better times, it signaled the CPU to
energize the radio or de-energize it if it was already on.

       The shop we went to did pay for the damage without any fight.
They initially said that someone had bumped the handle of a wrench
against Earth as they were either removing the old battery or
installing the new one.  In this case, Earth was a small metal pipe
assembly on the liquid side of the air conditioning condenser and the
resulting spark burned a pin hole right through the metal and let out
all the refrigerant.

       That certainly explains the burn hole in the pipe.  What that
story doesn't explain is how a fuse got blown and why the radio got
killed.

       The fuse was never exactly identified, but what I really think
happened was that it was a reverse polarity protector on the car
computer.  After all, that's expensive so the manufacturer probably
saw fit to put a reverse polarity diode and fuse on it.  The radio, on
the other hand, is not nearly as expensive and there was no protection
on it at all, not even an en-line fuse.

       How they fried the radio and burned the liquid line in one
operation is a real feat of something, although the exact words escape
me.  I know one is supposed to connect the frame or Earth lead last
and disconnect it first to prevent just such catastrophes from
happening.  Heaven only knows what really happened.

Martin McCormick WB5AGZ  Stillwater, OK
OSU Information Technology Division Network Operations Group
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2004\09\01@184336 by Jinx

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> Probably, but much to high for me to consider adding to my shop,
> I sell a non-switch RE for $1 :)

Just out of curiosity I asked at the local Piher agent this morning and
got a price of NZ$1 - 1.50 for the switched C1-11, depending on
quantity. I've an order for other parts going through them anyway, might
get 1/2 doz encoders JFTHOI

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2004\09\02@052956 by David P Harris
2004\09\02@175919 by Jinx
2004\09\02@182957 by David P Harris
2004\09\02@200944 by Josh Koffman

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