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how to develop simple touch screen mechanism

H

hunzai

Jan 1, 1970
0
Hi,

Is there any way to build simple touch screen mechanism for graphic or
alpha numaric LCD screen that is interfaced with microcontroller.

regards
Hunzai
 
P

PeteS

Jan 1, 1970
0
At a minimum, you'll need switchable drivers (simple) and a decent A-D.

I suggest reading about the operation of touch panels (in case you
don't know) as there are a number of types. That assumes, of course,
that you are going to use a commercial touch panel.

Try the Wolfson data sheet (has a decent explanation of touch panel
operation) for their combination AC97 / touch panel controller

www.wolfson.co.uk/products/WM9712/

Cheers

PeteS
 
D

Don McKenzie

Jan 1, 1970
0
hunzai said:
Hi,

Is there any way to build simple touch screen mechanism for graphic or
alpha numaric LCD screen that is interfaced with microcontroller.

regards
Hunzai

we are developing a small LCD touch screen, but it may be a couple of
months before it will be marketed.

http://www.dontronics.com/micro-lcd.html

Don...



--
Don McKenzie
E-Mail Contact Page: http://www.dontronics.com/e-mail.html

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M

mike

Jan 1, 1970
0
hunzai said:
Hi,

Is there any way to build simple touch screen mechanism for graphic or
alpha numaric LCD screen that is interfaced with microcontroller.

regards
Hunzai

NO!
What are you trying to accomplish?
When you say "build", what do you mean?
What do you mean by touch? Finger? stylus? For a small display
a finger might be too big. The technology used may be critically
dependent on what you're gonna use to "touch" it.
The bottom line is that while conceptually simple, it's unlikely
that you could build one for less than what it costs to buy one.

When you say "alpha numeric", I infer that you need less than full
position reporting. If all you want is selection with soft buttons,
one way is to position a line of buttons under the display with
labels that are dispayed above on the LCD. You have context sensitive
buttons without any touch input at all.

If you have the ability to deposit transparent conductive material on
plastic, you have a lot of other options. If that material happens to
be uniformly resistive, you have more options.

Then there are other technologies. All simple conceptually, but
requiring specialized equipment to fabricate.

What you do depends a lot on what you're trying to accomplish.

mike


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P

Pooh Bear

Jan 1, 1970
0
hunzai said:
Hi,

Is there any way to build simple touch screen mechanism for graphic or
alpha numaric LCD screen that is interfaced with microcontroller.

Yes.

Graham
 
P

Pooh Bear

Jan 1, 1970
0
mike said:

No ?

You're talking rubbish.

This is one of my fave areas.

A certain company I worked for wasn't called Touchscreen Technology by
accident.

It's a mature technology and great fun.

Also very easy to use. Expensive though ! :-(

Now pls - ask the more detailed question.

Graham
 
M

mike

Jan 1, 1970
0
Pooh said:
mike wrote:




No ?

You're talking rubbish.

So, you're saying that it's easy to build a touchscreen if you're
a touchscreen manufacturing company? Whooda thunkit!! I'm flabbergasted
by this revalation. I have to sit down until my heart palpitations
subside...I may even have an orgasm...

Do please elaborate on how someone who didn't have the resources
of a touchscreen company might "build" such a device (for less than the
cost to buy one).
I gots my soldering iron hot too. Let's do it.

mike
This is one of my fave areas.

A certain company I worked for wasn't called Touchscreen Technology by
accident.

It's a mature technology and great fun.

Also very easy to use. Expensive though ! :-(

Now pls - ask the more detailed question.

Graham



--
Wanted, Serial cable for Dell Axim X5 PDA.
Return address is VALID but some sites block emails
with links. Delete this sig when replying.
FS 500MHz Tek DSOscilloscope TDS540 Make Offer
Bunch of stuff For Sale and Wanted at the link below.
MAKE THE OBVIOUS CHANGES TO THE LINK
ht<removethis>tp://www.geocities.com/SiliconValley/Monitor/4710/
 
M

martin griffith

Jan 1, 1970
0
Yes.

Graham
ISTR a Byte magazine article, a long time ago, that used strobed leds
and optical sensors around the edge of the screen. Even a PIC could do
that if you are daft enough to use one


martin
 
P

PeteS

Jan 1, 1970
0
I am not clear if the OP wanted to make a touch screen or acquire a
commercial one and simply drive it properly.
Depending on other local circuitry, even that can have plenty of it's
own pitfalls ( I know - I have one very close to a cold cathode
backlight inverter ;)

Cheeers

PeteS
 
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