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'[EE] Extinct? Cheap Membrane Keypads'
2007\05\03@071259 by Forrest Christian

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face
So I've got a project that I'm starting to intitial work on.  I'm going
to need a keypad or similar for the user interface.  I would prefer a
membrane keypad that I could just stick on the front of a semi-custom
enclosure (heck I would *love* an enclosure with a standard (2x16 or so)
LCD opening and a keypad already on it, but no such luck).

Back in the 'olden days' (about 1985) of computers, it seemed like every
electronic part catalog had a selection of keypads which were fairly
inexpensive and fairly standard.  I.E. various array sizes (4x3 was
rather common - along with other sizes), with 2-3 options for the
labeling..  I.E. telephone style, or 0-9 with arrow keys around the
center, or arrow keys only, etc.  AND they weren't all that bad price-wise.

Now I finally need some on an ongoing basis, I can't find any reasonable
source.  Lot of places to make me a custom one which I would love but I
doubt I'll like the per-unit cost when I only need 20-50 at a time.

Are standard membrane keypads extinct or is there some secret island
somewhere where they are all hiding out?

Cheap and easy to design/manufacturer (from my viewpoint) alternatives
are also welcomed.

Mainly I'm  just looking for something I can adapt for common interface
needs such as previous/next and numeric entry.  And like I mentioned
above, already in a standard case is a plus.

-forrest

2007\05\03@072200 by Dario Greggio

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Forrest Christian wrote:

> So I've got a project that I'm starting to intitial work on.  I'm going
> to need a keypad or similar for the user interface.  I would prefer a
> membrane keypad that I could just stick on the front of a semi-custom [...]

I work for a manufacturer of any kind of membrane keyboard, here in Turin.
http://www.k-tronic.it

don't know if it may be good for you :-)

--
Ciao, Dario

2007\05\03@080846 by wouter van ooijen

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> I work for a manufacturer of any kind of membrane keyboard,
> here in Turin. http://www.k-tronic.it

ask your webmaster to check the link to the english catalog!

does your company provide a price list? I see only a form to submit a
(price) request.

Wouter van Ooijen

-- -------------------------------------------
Van Ooijen Technische Informatica: http://www.voti.nl
consultancy, development, PICmicro products
docent Hogeschool van Utrecht: http://www.voti.nl/hvu



2007\05\03@082502 by olin piclist

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Dario Greggio wrote:
> I work for a manufacturer of any kind of membrane keyboard, here in
> Turin. http://www.k-tronic.it

I just went to check out your page.  Tell your web designer to cut down on
the caffeine!  I didn't try clicking on either of the flags though, so maybe
it gets a little calmer later.


********************************************************************
Embed Inc, Littleton Massachusetts, http://www.embedinc.com/products
(978) 742-9014.  Gold level PIC consultants since 2000.

2007\05\03@082517 by Dario Greggio

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wouter van ooijen wrote:

>>I work for a manufacturer of any kind of membrane keyboard,
>>here in Turin. http://www.k-tronic.it
>
> ask your webmaster to check the link to the english catalog!

I'm sorry, I meant "I work for them SOMETIMES as a PIC consultant (and
not the only one)"
But sure I'll let them know! :-)
(I did check now the english version, and actually it has some major
problems... you know, in Italy English is not taught nor learnt.. why
should we, after all? We have pizza, mandolino... :-( )

> does your company provide a price list? I see only a form to submit a
> (price) request.

I could ask them, but it may take some time. AFAIK, they don't sell much
via internet.

If you can use the form, describing the product you need, it may be good
enough. And, since they probably won't be able to read English, you
could cut & paste to send the same request to me...


--
Ciao, Dario
--
ADPM Synthesis sas - Torino
--
http://www.adpm.tk

2007\05\03@082834 by Dario Greggio

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wouter van ooijen wrote:

>>I work for a manufacturer of any kind of membrane keyboard,
>>here in Turin. http://www.k-tronic.it
>
> ask your webmaster to check the link to the english catalog!

I'm sorry, I meant "I work for them SOMETIMES as a PIC consultant (and
not the only one)"
But sure I'll let them know! :-)
(I did check now the english version, and actually it has some major
problems... you know, in Italy English is not taught nor learnt.. why
should we, after all? We have pizza, mandolino... :-( )

> does your company provide a price list? I see only a form to submit a
> (price) request.

I could ask them, but it may take some time. AFAIK, they don't sell much
via internet.

If you can use the form, describing the product you need, it may be good
enough. And, since they probably won't be able to read English, you
could cut & paste to send the same request to me...


--
Ciao, Dario
--
ADPM Synthesis sas - Torino
--
http://www.adpm.tk


2007\05\03@083242 by Dario Greggio

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Olin Lathrop wrote:

> I just went to check out your page.  Tell your web designer to cut down on
> the caffeine!  I didn't try clicking on either of the flags though, so maybe
> it gets a little calmer later.

Same as above :-))
Yeah, you're absolutely right.
Their boss can be a good person at times, but I think he suffers from
the usual syndrome from "My webpage shows how big are my genitals..." !!

--
Ciao, Dario

2007\05\03@084206 by wouter van ooijen

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> If you can use the form, describing the product you need

I don't need any specific product, I just want to check prices of
various products (presumaly varying with quantity) to see which (if any)
I could sell in my shop.

And I agree with Olin: your (OK, their) webmaster would definitely
qualify for a bad website design contest. It might be flashy and nice to
some eyes (not to mine), but it hides the info more than it makes it
accessible.

Wouter van Ooijen

-- -------------------------------------------
Van Ooijen Technische Informatica: http://www.voti.nl
consultancy, development, PICmicro products
docent Hogeschool van Utrecht: http://www.voti.nl/hvu




2007\05\03@085159 by Dario Greggio

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wouter van ooijen wrote:

> I don't need any specific product, I just want to check prices of
> various products (presumaly varying with quantity) to see which (if any)
> I could sell in my shop.

Ok. Then I'll ask for some standard models, say the 4x3 that Forrest
asked for, a standard PC keyboard, a rugged one... something like this.
And let you know.
Where are you located, BTW? Holland?

> qualify for a bad website design contest. It might be flashy and nice to
> some eyes (not to mine), but it hides the info more than it makes it
> accessible.

yeah, indeed.
This "restyling" must've happened no longer than 2 years ago. Previous
site was more "plain".

--
Ciao, Dario

2007\05\03@102230 by Jon Chandler

picon face
Have you checked out Rose/Bopla?  They can be a pain in the butt....no,
they ARE a pain in the butt to deal with, but I believe some of their
handheld enclosures have a membrane or button keypads available.  If you
find anything that might work, the German web site (with a flag to click
for English) often has better documentation.

Jon



Forrest Christian wrote:
{Quote hidden}

2007\05\03@102624 by Chris Smolinski

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>wouter van ooijen wrote:
>
>>  I don't need any specific product, I just want to check prices of
>>  various products (presumaly varying with quantity) to see which (if any)
>>  I could sell in my shop.
>
>Ok. Then I'll ask for some standard models, say the 4x3 that Forrest
>asked for, a standard PC keyboard, a rugged one... something like this.
>And let you know.

Coincidentally, I'm in the market for some simple keypads as well.
4x3 would probably be fine. I'm surprised the various custom keypad
companies don't offer a selection of "stock" products as well. Sounds
like a good market for such products.

--

---
Chris Smolinski
Black Cat Systems
http://www.blackcatsystems.com

2007\05\03@110239 by Alan B. Pearce

face picon face
>>I work for a manufacturer of any kind of membrane keyboard,
>>here in Turin. http://www.k-tronic.it
>
> ask your webmaster to check the link to the english catalog!

Co-incidentally today we have a display on site of all sorts of industrial
suppliers, and one of them is a distributor of a label printer. It prints
onto vinyl for doing labels, warning signs, pamper proof labels etc.

I asked about using it to make membranes for keypads, and he said it was
certainly possible. I am thinking along the lines of the site linked above
where they talk about membrane with mechanical key (they mention using Omron
or RAFI keys), but I guess it could also be done using membrane on rigid
circuit board.

The company I saw here was specifically selling the printer and supplies
http://www.lighthouse.uk.com/ but I suspect for a evaluation version you
could go to a company that does vinyl advertising signs for small
quantities. He also talked about being able to use a clear vinyl layer over
the top to protect the printing from usage wear.

For the OP though, it may still be worth looking at the membrane ones under
the standard keyboards. There are a half dozen or so of various sizes
numeric with additional function and alpha keys.

2007\05\03@132230 by Forrest Christian

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wouter van ooijen wrote:
> I don't need any specific product, I just want to check prices of
> various products (presumaly varying with quantity) to see which (if any)
> I could sell in my shop.
>  
My next step with this whole thing was to figure out some standard
layout which would work for me and order 100 of them for this and future
products.  If there is interest, I would be interested in going in with
others for a bulk purchase if we could come up with a reasonable layout.

What I had envisioned was a single keypad which was 3x4 and had both the
"telephone" style legend (1-9 and 0, plus "clear" and "enter" labeled at
asterisk or pound), and also an arrow navigation legend (arrows where 2,
4, 6, and 8 are on the keypad, and then labeling 1,3,5,7,9,* and # with
useful words or not - still TBD) on the same keypad.

The other option was two different keypads - a 3x3 "arrow" keypad for
those applications where menu navigation is needed and a 3x4 or 4x4
keypad for where numeric entry is needed.  If I had the 4x4, I'd have
the standard telephone layout, plus "enter", "erase" and a couple of
others from things like "help", "menu", "back", "up", "down", or perhaps
some arrows.

A 1x4 or 1x3 would also be nice, either unlabeled, to go under the
bottom row of a LCD panel which defines the buttons on the LCD, or
simply labeled something like "Up Down Enter Back"

I'm still hoping to come across a vendor or two that just already does
this, but if not, then I guess I'll have to put some more thought into
exactly what I want (instead of being able to look at a catalog and
saying "that will work").

-forrest


2007\05\03@140247 by Timothy Weber

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Forrest Christian wrote:
> What I had envisioned was a single keypad which was 3x4 and had both the
> "telephone" style legend (1-9 and 0, plus "clear" and "enter" labeled at
> asterisk or pound), and also an arrow navigation legend (arrows where 2,
> 4, 6, and 8 are on the keypad, and then labeling 1,3,5,7,9,* and # with
> useful words or not - still TBD) on the same keypad.

These are not identical, but maybe close enough?

www.allelectronics.com/cgi-bin/category/300/Keypads.html
--
Timothy J. Weber
http://timothyweber.org

2007\05\03@142929 by Charles Craft

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March 2007 Nuts And Volts had a write up on All Electronics.


http://www.nutsvolts.com/toc_Pages/mar07toc.htm

IN THE SPOTLIGHT (NEW FEATURE)
Each month, a different advertiser will be "spotlighted".

This Month: All Electronics. .

{Original Message removed}

2007\05\03@151258 by Timothy Weber

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Timothy Weber wrote:
> Forrest Christian wrote:
>> What I had envisioned was a single keypad which was 3x4 and had both the
>> "telephone" style legend (1-9 and 0, plus "clear" and "enter" labeled at
>> asterisk or pound), and also an arrow navigation legend (arrows where 2,
>> 4, 6, and 8 are on the keypad, and then labeling 1,3,5,7,9,* and # with
>> useful words or not - still TBD) on the same keypad.
>
> These are not identical, but maybe close enough?
>
> http://www.allelectronics.com/cgi-bin/category/300/Keypads.html

And I just happened to notice this page while looking at the facing page
in Digi-Key's catalog:

http://dkc3.digikey.com/PDF/T072/P1754.pdf

Not cheap, though.
--
Timothy J. Weber
http://timothyweber.org

2007\05\03@151700 by Steve Moulding

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Forrest Christian wrote:
{Quote hidden}

Try Sil-Walker in Camarillo, CA - they have a pretty good selection of stock
membrane switches and kits.  Their button labeling is set up so you can use
custom labels, and the switches seem to be good quality and reasonably
priced.  Unfortunately you have to order by telephone - their web site
doesn't allow on-line ordering.  Good luck with your search.

Steve

http://www.vcnet.com/silwkr




2007\05\03@152748 by Gerhard Fiedler

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Forrest Christian wrote:

> Now I finally need some on an ongoing basis, I can't find any reasonable
> source.  Lot of places to make me a custom one which I would love but I
> doubt I'll like the per-unit cost when I only need 20-50 at a time.

It may not be that bad, using a membrane with dome contacts or a membrane
with tact switches. Have you tried some manufacturers?

Gerhard

2007\05\03@173816 by Forrest Christian

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Gerhard Fiedler wrote:
> It may not be that bad, using a membrane with dome contacts or a membrane
> with tact switches. Have you tried some manufacturers?
(Referring to low qty pricing)...

The ones I talked to wanted something like either $1K setup or some
horrendous minimum order.  Not saying there aren't cheap ones out
there..since I only tried a couple.

-forrest

2007\05\03@174407 by Forrest Christian

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Timothy Weber wrote:
> These are not identical, but maybe close enough?
>
> www.allelectronics.com/cgi-bin/category/300/Keypads.html
>  
I like the legend, but the problem with these are that they are 1/3"
thick which is ok for a panel, but not ok for a small plastic enclosure
(which sometimes doesn't have much more than 1/3" to work with).

Digikey has the same keypads - with it looks like the same problem.

The ones I've seen in the past are flat and adhesive.  They usually have
a flat ribbon cable (often the printed circuit plastic stuff) which
slides through a hole in the enclosure and connects to a FFC/FPC
connector on the circuit board.

-forrest

2007\05\03@175414 by Timothy Weber

face picon face
Forrest Christian wrote:
> Gerhard Fiedler wrote:
>> It may not be that bad, using a membrane with dome contacts or a membrane
>> with tact switches. Have you tried some manufacturers?
> (Referring to low qty pricing)...
>
> The ones I talked to wanted something like either $1K setup or some
> horrendous minimum order.  Not saying there aren't cheap ones out
> there..since I only tried a couple.

Have you tried a laminated color laser print, + glue or a bezel to
attach it to the enclosure, + drilled holes to let board-mounted tactile
switches stick through?

I'm planning this for a current project, and it seems pretty simple
though it's not done yet (waiting for boards to come back).  I know some
other folks here have mentioned doing it similarly.
--
Timothy J. Weber
http://timothyweber.org

2007\05\03@183537 by Forrest Christian

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Timothy Weber wrote:
> Have you tried a laminated color laser print, + glue or a bezel to
> attach it to the enclosure, + drilled holes to let board-mounted
> tactile switches stick through?
No but that's an idea.   Actually I like it.

By laminated do you mean the traditional method of heat adhering plastic
to both sides of a sheet of paper with a lamination machine, or
something more exotic?

It occurs to me that the Craft Robo I use to make custom panel labeling
(use avery weatherproof identification labels, print on color laser,
then use the craft robo on it's lightest cut setting to cut the label
into the correct shape including holes) could be put into service for
this as well for things like cutting a hole in the paper to let a LCD
live behind the lamination and also final trim (depending on weight of
the laminate).

Has anyone done this successfully?  I would be interested in hearing
about durability of this application and whether any type of laminate
works better than another.

-forrest

2007\05\03@192122 by Gerhard Fiedler

picon face
Forrest Christian wrote:

>> It may not be that bad, using a membrane with dome contacts or a
>> membrane with tact switches. Have you tried some manufacturers?
> (Referring to low qty pricing)...
>
> The ones I talked to wanted something like either $1K setup or some
> horrendous minimum order.  Not saying there aren't cheap ones out
> there..since I only tried a couple.

I've had some membranes made here (Brazil), first order ~$300 for 20,
follow-up orders much less than that (because the tools for cutting the
shape and making the domes for the switches are already made).

http://www.netpar.com.br/teclaflex/index.htm

Gerhard

2007\05\03@193250 by Timothy J. Weber

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Forrest Christian wrote:
> Timothy Weber wrote:
>> Have you tried a laminated color laser print, + glue or a bezel to
>> attach it to the enclosure, + drilled holes to let board-mounted
>> tactile switches stick through?
> No but that's an idea.   Actually I like it.

As I understand it, it scales pretty well - I'm doing it for one hobby
project and also contracting out the design of an custom-molded
enclosure for a work project that will use the same basic idea for the
buttons.  Cf. the exploded view at
<http://www.sparkfun.com/commerce/hdr.php?p=custom_plastic_cutting>.

> By laminated do you mean the traditional method of heat adhering plastic
> to both sides of a sheet of paper with a lamination machine, or
> something more exotic?

Something more exotic would be used in "real" production, but I'm
planning on taking my Illustrator file down to the corner copy shop!

> It occurs to me that the Craft Robo I use to make custom panel labeling

Huh!  Very useful-looking gadget.

> be put into service for
> this as well for things like cutting a hole in the paper to let a LCD
> live behind the lamination and also final trim (depending on weight of
> the laminate).

Yeah, that sounds ideal for making moderate quantities.
--
Timothy J. Weber
http://timothyweber.org

2007\05\04@014657 by Roy

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www.rsnewzealand.com

Searched RS components and found several hits using key words "Sealed
Membrane Keypad"


_______________________________________

Roy Hopkins             ZL2RJH
Tauranga
New Zealand
_______________________________________



2007\05\04@041700 by Alan B. Pearce

face picon face
> It occurs to me that the Craft Robo I use to make custom panel labeling

That looks like a machine that does similar things to the Lighthouse one I
posted yesterday, except the Lighthouse one does the printing and cutting
all in the one machine.

Might have to investigate a Craft Robo though, that looks an interesting
machine.

2007\05\04@082049 by Forrest W Christian

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Roy wrote:

>http://www.rsnewzealand.com
>
>Searched RS components and found several hits using key words "Sealed
>Membrane Keypad"
>
Yes, and all not cheap (even after converting to USD).

-forrest

2007\05\04@082824 by Forrest W Christian

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Alan B. Pearce wrote:

> That looks like a machine that does similar things to the Lighthouse
> one I posted yesterday, except the Lighthouse one does the printing
> and cuttingall in the one machine.

I haven't been able to google this machine, do you have a link (must
have missed the original message).

>Might have to investigate a Craft Robo though, that looks an interesting
>machine.
>  
>
I have the cheap one and it works rather nicely.  I use avery 6575
"permanent durable ID labels" and print them on the color laser.  Then
run it through the craft robo - set to as light as it will go and they
are cut just right.

I have to admit I haven't tried additional media in it, but like it well
enough I will be buying another one for redundancy and also to try to
work with other materials.

-forrest

2007\05\04@084705 by Alan B. Pearce

face picon face
>I haven't been able to google this machine, do you have a
>link (must have missed the original message).

OK, resend of original message.

{Quote hidden}

> --

2007\05\04@092746 by Jon Chandler

picon face
Timothy Weber wrote:
> Have you tried a laminated color laser print, + glue or a bezel to
> attach it to the enclosure, + drilled holes to let board-mounted tactile
> switches stick through?
>
> I'm planning this for a current project, and it seems pretty simple
> though it's not done yet (waiting for boards to come back).  I know some
> other folks here have mentioned doing it similarly.
>  

I've used this technique quite successfully.  Prototype instruments were
built this way and worked quite well.  Production instruments replaced
the laminated label with a commercial embossed label.  My circuit board
has 7-segment LED displays, so getting the board at the right spacing
was difficult - we solved that issue by putting an adhesive cork "dot"
from the hardware store on top of each switch to get the correct spacing.

For the label itself, I used an inkjet printer and I believe HP inkjet
photo paper, which is actually some kind of thin plastic (about the
thickness of a normal sheet of copy paper).  When it was laminated, it
became one with the laminating material - there was no risk of
separation.  For LEDs, I used a dark background and left a white
(unprinted) area over each LED.  Here's a picture of one of the
prototype instruments, still in use after 6 years of service:

http://www.spintelligentlabs.com/st101main.html

Jon


2007\05\04@094812 by Jon Chandler

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Jon Chandler wrote:
{Quote hidden}

An additional advantage of doing it this way rather than using a
membrane switch is that everything was on the circuit board. The board
could be fully used and tested outside the enclosure and simply dropped
in the enclosure when it was time for final assembly.

Jon


2007\05\04@104202 by Timothy Weber

face picon face
Jon Chandler wrote:
> Timothy Weber wrote:
>> Have you tried a laminated color laser print, + glue or a bezel to
>> attach it to the enclosure, + drilled holes to let board-mounted tactile
>> switches stick through?
>>
>> I'm planning this for a current project, and it seems pretty simple
>> though it's not done yet (waiting for boards to come back).  I know some
>> other folks here have mentioned doing it similarly.
>
> I've used this technique quite successfully.  Prototype instruments were
> built this way and worked quite well.  Production instruments replaced
> the laminated label with a commercial embossed label.  My circuit board
> has 7-segment LED displays, so getting the board at the right spacing
> was difficult - we solved that issue by putting an adhesive cork "dot"
> from the hardware store on top of each switch to get the correct spacing.

Yes - Getting the switch actuator height just right is the only fiddly
thing.  For the quick-and-dirty one I'm working on now, it turned out
that inserting a piece of wire under the switch before soldering it on
the board makes it just the right height!  Dumb but feasible for small
quantities.  I like the cork dot too.
--
Timothy J. Weber
http://timothyweber.org

2007\05\04@111852 by William Chops Westfield

face picon face
I suspect that part of the reason standardized keypads are
harder to find these days is that anyone can put together a
simple PCB, a printed label, and some of these "tactile domes"
and make their own custom keypad:

http://rocky.digikey.com/scripts/ProductInfo.dll?Site=US&V=39&M=B3D-5112

The 5mm domes at digikey sound pretty tiny (cellphone keypad),
but I'm pretty sure I've seen them up to about 10mm.  Somewhere.

BillW

2007\05\04@120423 by Timothy Weber

face picon face
William Chops Westfield wrote:
> I suspect that part of the reason standardized keypads are
> harder to find these days is that anyone can put together a
> simple PCB, a printed label, and some of these "tactile domes"
> and make their own custom keypad:
>
> rocky.digikey.com/scripts/ProductInfo.dll?Site=US&V=39&M=B3D-5112
>
> The 5mm domes at digikey sound pretty tiny (cellphone keypad),
> but I'm pretty sure I've seen them up to about 10mm.  Somewhere.

Makes sense!  I like 'em.

But it does seem like there are practical limitations.  You pretty much
have to build an external actuator into your enclosure somehow (as
indicated in the data sheet), no?  Either that, or mount the PCB flush
to the underside of the enclosure top, with no standoffs - and you might
still need the equivalent of the cork dot or molded actuator, depending
on the thickness of the enclosure wall - and you lose the ability to
have anything on that side of the board, maybe even including PTH
components on the other side.

Also, the data sheet calls for gold-plated nickel patterns on the PCB.
Probably would work with the usual tinned copper, but maybe with
decreased lifespan?

In essence, they're giving you the guts of a tactile switch and you make
the rest (actuator + contact surface).  Definitely makes sense in some
contexts, but may be harder for prototyping/small runs.  And you don't
get that benefit that Jon mentioned, that the PCB is fully functional on
its own (because they caution against ever touching these things with
your fingers).

But still.  Another option.
--
Timothy J. Weber
http://timothyweber.org

2007\05\04@145410 by Robert Ammerman

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here are a few:


http://www.meci.com/index.php/cPath/439


http://www.73.com/a/0209.shtml

http://www.fairradio.com/catalog.php?mode=viewitem&item=5121 (I think this
has pop-off key tops allowing you to put your own captions on the keys)

http://www.bgmicro.com/index.asp?PageAction=PRODSEARCH&txtSearch=keypad&Page=1

One specific one I from above that I have used, very successfully:
http://www.bgmicro.com/index.asp?PageAction=VIEWPROD&ProdID=10599

Bob Ammerman
RAm Systems


2007\05\04@151134 by M. Adam Davis

face picon face
On 5/3/07, Forrest Christian <spam_OUTforrestcTakeThisOuTspamimach.com> wrote:
> Lot of places to make me a custom one which I would love but I
> doubt I'll like the per-unit cost when I only need 20-50 at a time.

Send them an email anyway.  Indicate what your general requirements
are, and ask if they already have the tooling complete for something
similar so you can just order small quantities.

-Adam

--
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Moving in southeast Michigan? Buy my house: http://ubasics.com/house/

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2007\05\04@151702 by Robert Ammerman

picon face
>I suspect that part of the reason standardized keypads are
> harder to find these days is that anyone can put together a
> simple PCB, a printed label, and some of these "tactile domes"
> and make their own custom keypad:
>
> rocky.digikey.com/scripts/ProductInfo.dll?Site=US&V=39&M=B3D-5112
>
> The 5mm domes at digikey sound pretty tiny (cellphone keypad),
> but I'm pretty sure I've seen them up to about 10mm.  Somewhere.

don't you want gold plate on the PCB where the domes are?

Bob Ammerman
RAm Systems

2007\05\04@184958 by Robert Rolf

picon face
William Chops Westfield wrote:

> I suspect that part of the reason standardized keypads are
> harder to find these days is that anyone can put together a
> simple PCB, a printed label, and some of these "tactile domes"
> and make their own custom keypad:
>
> rocky.digikey.com/scripts/ProductInfo.dll?Site=US&V=39&M=B3D-5112
>
> The 5mm domes at digikey sound pretty tiny (cellphone keypad),
> but I'm pretty sure I've seen them up to about 10mm.  Somewhere.

http://www.snaptron.com/
Lots of choices. Good sampling policy too.
Sample kit.

Robert


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