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'[EE]: Touch screen?'
2002\09\08@122510 by Pic Dude

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Anyone have a link or other pointer on how to make small touch screens?  I
want a small keypad for a 16x2 or 20x2 LCD display, and thinking that a
touch screen would be nice for this.  My resolution would be small as well,
say 10 or 20 cols max and only 1 or 2 rows.

Actually, for a 1-row touch screen, all I need is some material that changes
capacitance or resistance.  I can lay this over the unit and should be able
to figure out the rest.  I also thought of using a phototransistor array for
a single-row touch-screen, but that would probably protrude too far out and
look ugly.

Thanks,
-Neil.

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2002\09\08@123418 by DFansler

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May not be exactly what you want, but I have used a pre made touch panel lcd
display by C Sys Labs (http://www.csyslabs.com) - pretty cool implementation.


David V. Fansler
.....DFanslerKILLspamspam@spam@MindSpring.com
http://www.DV-Fansler.com

{Original Message removed}

2002\09\08@130656 by Pic Dude

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Hmmm... actually very much what I need, but the first (small)
unit I chose (240 x 64 monochrome display w/touch scree) is
$349.  Ouch!!!

At that rate, I could modify a Palm Pilot or something.

Cheers,
-Neil.



> {Original Message removed}

2002\09\09@051934 by Alan B. Pearce

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>Actually, for a 1-row touch screen, all I need is some material that
changes
>capacitance or resistance.  I can lay this over the unit and should be able
>to figure out the rest.

You could do this for a two row screen as well, by making sure that the
items to be selected had a horizontal offset between them, so the only thing
you need is the horizontal position to know if the item is in the upper or
lower line. :)

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2002\09\09@165740 by Jeremy Walworth

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If this company can sell custom size touch panels, this might be a possible
solution for you:
http://www.touchscreens.com/products-addon.html

-J

At 11:57 AM 9/8/02 -0400, you wrote:
{Quote hidden}

Jeremy S. Walworth
"I fly, I sail, I throw caution to the wind"  -Jimmy Buffett
http://www.jeremyanddarcy.com

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2002\09\09@203100 by Pic Dude

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These are all so pricey. :-(  Latest thought is to gut an
old Palm Pilot (~$20-$30 on Ebay).  Anyone have info/links
on how to hardwire directly to the touch-screen on those?

Cheers,
-Neil.



> {Original Message removed}

2002\09\09@223225 by Larry Williams

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just write a simple serial program that sends the button out the serial
port to your pic. go to NSBASIC.com and download a demo of a basic
compiler for the palm. If you don't register the program, your program
will quit functioning after 5 days but its only $149 and is very close
to visual basic. There is even a sample serial program so all you have
to do is modify it for your own use.

Pic Dude wrote:
>
> These are all so pricey. :-(  Latest thought is to gut an
> old Palm Pilot (~$20-$30 on Ebay).  Anyone have info/links
> on how to hardwire directly to the touch-screen on those?
>
> Cheers,
> -Neil.
>
> > {Original Message removed}

2002\09\09@231336 by Pic Dude

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You mean, that's assuming that I use the full Palm,
including the OS, etc, right?

I do have Metrowerks C, etc for the Palm, and know
how to develop apps for it, but I was hoping to just
snag the display out of it.  Among other things, I
also intend to interface this to the parallel port
of the PC, since I'm avoiding the 12V requirement
of the motherboard, as much as possible.

Wouldn't happen to know how to work directly with
the LCD and touch screen that comes with the Palm
do you?

Cheers,
-Neil.



> {Original Message removed}

2002\09\09@233619 by Larry Williams

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No, for the price they go for, its too cheep to tear apart. The M100
goes for about $30 - $40. Some places have then NIB for $50 or so.  Runs
on 3 volts, and the hardware serial port and the IR port are easy to
interface.  I found a hack that keeps the unit powered up all the time
and another that keeps the backlight on. Haven't tried them yet but
intend to do so this week sometime.  Using a ser to par converter, you
could still use the par port on your pc.  What I like about using the
whole thing is, you take it out of the box, dump the program to it, send
it out to the field.  If a customer wants a change in the way their pads
work, just send a tech out to reprogram them.

Pic Dude wrote:
{Quote hidden}

> > {Original Message removed}

2002\09\09@234621 by David Harris

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Hi-
Do you have a pointer to tose hacks, especially the 'keep the power on".
Thanks, David

Larry Williams wrote:

{Quote hidden}

> > > {Original Message removed}

2002\09\09@234822 by Pic Dude

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What I was hoping for was to have my app come up "instantly".
Other that ripping out the display (which IMHO is never too
cheap to do :-), I could achieve the same effect by using
some form of custom OS.  But there too, I'm clueless.

Cheers,
-Neil.



> {Original Message removed}

2002\09\09@234826 by Herbert Graf

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Since you're doing a PC in a car thing you might consider the route I took:
I used a character LCD display that outputs whatever I want and a standard
IR remote control, works very well. Of course, you may have more plans then
just mp3s, but if not... TTYL

> {Original Message removed}

2002\09\10@010850 by Pic Dude

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Let me go back to basics here... I was originally planning
to use a small character LCD, about a half-dozen keys, and
some type of scrolling device, like a rotary encoder, or
a wheel stolen from a scroll-mouse.  The keys were to be
placed below the character LCD, and the LCD could show
different meanings for the keys depending on mode/state.

However, the problem was aesthetics...I can't think of how
I would've made the panel etc, and aesthetics is a lot,
especially in my kitcar.  So the touch screen idea came up,
and thought I could work around the thumbwheel by using the
rotary encoder like a volume knob.  A simple hole is all
that's needed and it looks good.

So back near square one, perhaps someone has a link to a
nice 6 or 8 button low-profile keypad module I could purchase
for not too expensive?

Cheers,
-Neil.


> {Original Message removed}

2002\09\10@012200 by David Harris

picon face
Hi-
Try http://www.bgmicro.com for keypads, specifically:
http://www.bgmicro.com/pdf/page21.pdf
David

Pic Dude wrote:

{Quote hidden}

> > {Original Message removed}

2002\09\10@013548 by Ashley Roll

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Hi Neil,

Have you thought about making a "front panel" with a printer?

Just design your panel in some graphics package and take it to a print shop.
They can then print it using a colour laser printer (or you could even use a
bubble jet) Then have it laminated. Make sure the colour extends beyond the
edge of the panel so you can fit and trim it.

This gives you a nice "plastic" like decal. Next arrange some largish holes
(10mm?) under the switches and position small "micro tactile" key switches
under it so they just touch the laminated decal. When you push on the
plastic over your printed on button it gives enough to activate the tactile
switch. Hot melt glue is your friend here :) Alternatively, if you feel up
to it, design your PCB with the switches mounted on it so they are then
positioned correctly over the holes and decal.

If you get the paper laminated with a clear plastic, you can also make a
nice neat mast and window for your LCD by just cutting out the section
before you get it laminated. You can also cut small holes in the paper for
LEDs, IR detectors etc to go through.

You just stick the decal on with your favourite contact adhesive. You will
probably be able to fit multiple panels on the same sheet, this is a good
idea because you will almost certainly stuff one up. :) Also they will
eventually wear out, so having a replacement handy is good.

Cheap, Effective and surprising good looking if you are careful. I use this
technique when building prototypes for customers.

Cheers,
Ash.

---
Ashley Roll
Digital Nemesis Pty Ltd
http://www.digitalnemesis.com
Mobile: +61 (0)417 705 718




> {Original Message removed}

2002\09\10@014559 by Scott Dattalo

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On Sun, 8 Sep 2002, Pic Dude wrote:

> Anyone have a link or other pointer on how to make small touch screens?  I
> want a small keypad for a 16x2 or 20x2 LCD display, and thinking that a
> touch screen would be nice for this.  My resolution would be small as well,
> say 10 or 20 cols max and only 1 or 2 rows.
>
> Actually, for a 1-row touch screen, all I need is some material that changes
> capacitance or resistance.  I can lay this over the unit and should be able
> to figure out the rest.  I also thought of using a phototransistor array for
> a single-row touch-screen, but that would probably protrude too far out and
> look ugly.

This ain't gonna help, but my employer Synaptics has a clear capacitive
touch screen solution:

http://www.synaptics.com/technology/tcps.cfm

While we do have kits for these, I have no idea how much they cost or if
you can even purchase them. I personally wish they were sold at Digikey,
because they're so damn cool! (Toshiba is using them in one of their high
end laptops - they've replaced the TouchPad with an LCD screen and a
ClearPad Touch Screen).

Probaly even less useful to you, is Synaptics' partnership with Zytronic:

http://www.synaptics.com/press/pr_detail.cfm?prid=48

The primary market here is large touch screens for monitors.


Scott

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2002\09\10@051409 by Alan B. Pearce

face picon face
home.eu.omron.com/europe/www/cncweb.nsf/d9d48916a4b384d8c12565050025e
194/3e040d7d8ece4f2b412566f6004892e3?OpenDocument

Check these Omron switches, and under accessories for keycaps. They are not
the ones I was specifically thinking of, but are similar.

I'm sure if you went to Digikey or Mouser or some such store, you could find
something similar in the tactile type switch which would be suitable.

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2002\09\10@062558 by eronica Merryfield

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This might also interest you
http://www.maxim-ic.com/MAX1233
--
Veronica Merryfield, somewhere in Cambridgeshire, UK
"The best things in life aren't things"




{Original Message removed}

2002\09\10@112558 by Larry Williams

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In the setup for the palm unit, you can reassign all the buttons to your
program instead of theirs. Anytime you press a button, your program will
be there. If you let the unit go to sleep, when you press a button to
wake up, your program will appear right where you left it. For instance,
with the built in application, calculator, it has no exit key. If you
assign all keys to calc, then thats all the unit will do, unless you
press the home key on the touch screen.  I haven't tried to disable that
yet but will attempt eventually to do just that.


Pic Dude wrote:
>
> What I was hoping for was to have my app come up "instantly".
> Other that ripping out the display (which IMHO is never too
> cheap to do :-), I could achieve the same effect by using
> some form of custom OS.  But there too, I'm clueless.
>

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2002\09\10@113025 by Larry Williams

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If you get one of these pads, get the large membrane keypad and cut down
to the size you want. We do that for some items, works great. The black
12(SWT1068) and 16 button pads have too high a failure rate in vehicle
operation, ok otherwise. Have not had one of the flat membrane
pads(ACS1048) fail yet.

David Harris wrote:
{Quote hidden}

> > > {Original Message removed}

2002\09\10@191540 by J Bradshaw

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This might also interest you:
http://www.maxim-ic.com/quick_view2.cfm/qv_pk/2755

There is also an app note using the DS1680 touch screen controller and a
Pic:
http://www.maxim-ic.com/appnotes.cfm/appnote_number/1175

-j

>  From: Veronica Merryfield[SMTP:.....VERONICA.MERRYFIELDKILLspamspam.....TESCO.NET]
> Subject: Re: [EE]:  Touch screen?
> This might also interest you
> http://www.maxim-ic.com/MAX1233
> --
> Veronica Merryfield, somewhere in Cambridgeshire, UK
> "The best things in life aren't things"

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2002\09\11@005554 by Larry Williams

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NoDoze Plugin for Launch 1.1
located at:
www.pilotgear.com/software/showsoftware.cfm?sid=64843620020910205626&prodID=22882
to be used in conjuction with a launcher program such as:
www.pilotgear.com/software/showsoftware.cfm?sid=64843620020910205626&prodID=1394
or:
http://www.pilotgear.com/software/showsoftware.cfm?sid=64843620020910205626&prodID=1284

Assorted backlight control programs
http://www.pilotgear.com/software/answernew.cfm?sid=64843620020910205626&quicksearch2=backlight&CFID=2242098&CFTOKEN=33983322

other versions of the above are available through different sources,
just do a search on the web for palm, hacks, etc. software

David Harris wrote:
{Quote hidden}

> > > > {Original Message removed}

2002\09\11@010758 by Larry Williams

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use the launcher program in my next last email or any other.

Pic Dude wrote:
>
> What I was hoping for was to have my app come up "instantly".
> Other that ripping out the display (which IMHO is never too

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2002\09\11@054921 by Samuel BOUQUET

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I have already controlled a touch screen directly with a PIC. if you need
help / info on how works a resistive touch panel, download info on
http://www.dynapro.com, pages 84 and 85 of SC4_users.pdf (if it doesn't change).
I could send you a zip of those pages (166ko)

Sam

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[EraseMEPICLISTspam_OUTspamTakeThisOuTMITVMA.MIT.EDU]De la part de Larry Williams
Envoye : mercredi 11 septembre 2002 06:44
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Objet : Re: [EE]: Touch screen?


use the launcher program in my next last email or any other.

Pic Dude wrote:
>
> What I was hoping for was to have my app come up "instantly".
> Other that ripping out the display (which IMHO is never too

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2002\09\11@235654 by Larry Williams

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currently can be found archived at:
www.3m.com/3MTouchSystems/downloads/downloads/SC4_users.pdf
Man! There sure is a lot of dope here. Thanks for the lead.

Samuel BOUQUET wrote:
>
> I have already controlled a touch screen directly with a PIC. if you need
> help / info on how works a resistive touch panel, download info on
> http://www.dynapro.com, pages 84 and 85 of SC4_users.pdf (if it doesn't change).
> I could send you a zip of those pages (166ko)
>
> Sam

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