> jan wrote:
>> QMatrix circuits offer tremendous signal-to-noise ratios,
Nah - just reluctantly quoted it, because the OP seemed unable to
follow posted link to Qproc's docs!
> First time I've ever seen S/N ratio specified as "tremendous"
Yes, "tremendous" is hardly a technical term, but I believe that
their patented process does significantly simplify the effective
application of capacitive sensors.
Jan Coombs
Snip...
First time I've ever seen S/N ratio specified as "tremendous"
Reply by jan●August 10, 20072007-08-10
Ajab wrote:
> On Aug 6, 1:42 pm, The Real Andy <thereala...@nospam.com> wrote:
>> On Sun, 05 Aug 2007 22:42:05 -0700, Ajab <jasusvi...@yahoo.com> wrote:
>>> On Aug 4, 12:21 pm, jan <jans...@murray-microft.invalid> wrote:
>>>> Ajab wrote:
>>>>> We are thinking to interface LCD and this touch screen through a
>>>>> microcontroller.
>>>>> Is there any company available that provides microcontroller for
>>>>> capacitive touch screens?
>>>> Qprox chips provide a self-calibrating ready made solution with
>>>> serial outputs. Parts are available to scan up to 8x8 matrix:
>>>> http://www.qprox.com/products/qmatrix_whitepaper.php
>>>> It looks as though you might need two layers of transparent
>>>> conductor on your LCD.
>>>> Jan Coombs
>>>> --
>>> I want to use capacitive screens because the resistive ones get easily
>>> damaged by sharp objects.(this is what i read).
>> If you want touchs screen that is hard to damage then look at SAW
>> technology. You can mount these on glass that sits on top of LCD
>> panels to help save the LCD as well.- Hide quoted text -
>>
>> - Show quoted text -
>
> Yes. But SAW are prone to liquids.
> I need a touch screen which is resistant to sharp
> scratches,liquids(may be hot). Also it should be unaffected by IR and
> mobile radiations in vicinity. Projected capacitive seem better.
so, did you like the Qprox parts? From the white paper cited above:
QMatrix devices are digital charge-transfer (QT) ICs designed to
detect touch using a scanned, passive matrix of electrode sets to
achieve a large number of touch keys driven by a single chip.
. . .
QMatrix circuits offer tremendous signal-to-noise ratios, high
levels of immunity to moisture films, extreme levels of temperature
stability, superb low power characteristics, ease of wiring, and
small IC package sizes for a given key count, For these reasons,
QMatrix circuits are highly prized for automotive, kitchen
appliance, and mobile applications.
Jan.
Reply by Ajab●August 6, 20072007-08-06
On Aug 6, 1:42 pm, The Real Andy <thereala...@nospam.com> wrote:
> On Sun, 05 Aug 2007 22:42:05 -0700, Ajab <jasusvi...@yahoo.com> wrote:
> >On Aug 4, 12:21 pm, jan <jans...@murray-microft.invalid> wrote:
> >> Ajab wrote:
> >> > We are thinking to interface LCD and this touch screen through a
> >> > microcontroller.
> >> > Is there any company available that provides microcontroller for
> >> > capacitive touch screens?
>
> >> Qprox chips provide a self-calibrating ready made solution with
> >> serial outputs. Parts are available to scan up to 8x8 matrix:
>
> >> http://www.qprox.com/products/qmatrix_whitepaper.php
>
> >> It looks as though you might need two layers of transparent
> >> conductor on your LCD.
>
> >> Jan Coombs
> >> --
>
> >I want to use capacitive screens because the resistive ones get easily
> >damaged by sharp objects.(this is what i read).
>
> If you want touchs screen that is hard to damage then look at SAW
> technology. You can mount these on glass that sits on top of LCD
> panels to help save the LCD as well.- Hide quoted text -
>
> - Show quoted text -
Yes. But SAW are prone to liquids.
I need a touch screen which is resistant to sharp
scratches,liquids(may be hot). Also it should be unaffected by IR and
mobile radiations in vicinity. Projected capacitive seem better.
Reply by The Real Andy●August 6, 20072007-08-06
On Sun, 05 Aug 2007 22:42:05 -0700, Ajab <jasusvijay@yahoo.com> wrote:
>On Aug 4, 12:21 pm, jan <jans...@murray-microft.invalid> wrote:
>> Ajab wrote:
>> > We are thinking to interface LCD and this touch screen through a
>> > microcontroller.
>> > Is there any company available that provides microcontroller for
>> > capacitive touch screens?
>>
>> Qprox chips provide a self-calibrating ready made solution with
>> serial outputs. Parts are available to scan up to 8x8 matrix:
>>
>> http://www.qprox.com/products/qmatrix_whitepaper.php
>>
>> It looks as though you might need two layers of transparent
>> conductor on your LCD.
>>
>> Jan Coombs
>> --
>
>I want to use capacitive screens because the resistive ones get easily
>damaged by sharp objects.(this is what i read).
If you want touchs screen that is hard to damage then look at SAW
technology. You can mount these on glass that sits on top of LCD
panels to help save the LCD as well.
Reply by Harold Smith●August 6, 20072007-08-06
Cypress has micros with dedicated capacitive touch screen interface.
http://www.cypress.com/capsense/index.jsp
"Ajab" <jasusvijay@yahoo.com> wrote in message
news:1186378925.113550.149540@j4g2000prf.googlegroups.com...
> On Aug 4, 12:21 pm, jan <jans...@murray-microft.invalid> wrote:
>> Ajab wrote:
>> > We are thinking to interface LCD and this touch screen through a
>> > microcontroller.
>> > Is there any company available that provides microcontroller for
>> > capacitive touch screens?
>>
>> Qprox chips provide a self-calibrating ready made solution with
>> serial outputs. Parts are available to scan up to 8x8 matrix:
>>
>> http://www.qprox.com/products/qmatrix_whitepaper.php
>>
>> It looks as though you might need two layers of transparent
>> conductor on your LCD.
>>
>> Jan Coombs
>> --
>
> I want to use capacitive screens because the resistive ones get easily
> damaged by sharp objects.(this is what i read).
>
Reply by Ajab●August 6, 20072007-08-06
On Aug 4, 12:21 pm, jan <jans...@murray-microft.invalid> wrote:
> Ajab wrote:
> > We are thinking to interface LCD and this touch screen through a
> > microcontroller.
> > Is there any company available that provides microcontroller for
> > capacitive touch screens?
>
> Qprox chips provide a self-calibrating ready made solution with
> serial outputs. Parts are available to scan up to 8x8 matrix:
>
> http://www.qprox.com/products/qmatrix_whitepaper.php
>
> It looks as though you might need two layers of transparent
> conductor on your LCD.
>
> Jan Coombs
> --
I want to use capacitive screens because the resistive ones get easily
damaged by sharp objects.(this is what i read).
Reply by jan●August 4, 20072007-08-04
Ajab wrote:
> We are thinking to interface LCD and this touch screen through a
> microcontroller.
> Is there any company available that provides microcontroller for
> capacitive touch screens?
Qprox chips provide a self-calibrating ready made solution with
serial outputs. Parts are available to scan up to 8x8 matrix:
http://www.qprox.com/products/qmatrix_whitepaper.php
It looks as though you might need two layers of transparent
conductor on your LCD.
Jan Coombs
--
Reply by Neil●August 4, 20072007-08-04
Ajab wrote:
> We are thinking to interface LCD and this touch screen through a
> microcontroller.
> Is there any company available that provides microcontroller for
> capacitive touch screens?
>
Cypress is pushing the 8bit PSOC for this. The have an eval kit.
I think TI has the same thing with the 430
Reply by Bob●August 3, 20072007-08-03
Ajab wrote:
> We are thinking to interface LCD and this touch screen through a
> microcontroller.
> Is there any company available that provides microcontroller for
> capacitive touch screens?
>
I haven't tried it, but here's one:
http://www.onfulfillment.com/cypressstore/Product.aspx?srch=CY3214-PSoCEvalUSB&p=742&sid=205
Currently, we use resistive 4 wire for GUI input and I've wondered if
capacitive would work better (not so pressure sensitive). I haven't
figured out what the capacitive sensor configuration would be for a
graphical input (X/Y). Anybody know?
Bob