Connect with us

how to develop simple touch screen mechanism

Discussion in 'Electronic Design' started by hunzai, Oct 21, 2005.

Scroll to continue with content
  1. hunzai

    hunzai Guest

    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
     
  2. PeteS

    PeteS Guest

    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
     
  3. Don McKenzie

    Don McKenzie Guest

    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

    Micro,TTL,USB to 1.5" color LCD http://www.dontronics.com/micro-lcd.html
    USB,RS232 or TTL to VGA Monitor http://www.dontronics.com/micro-vga.html
    World's smallest USB 2 TTL Conv http://www.dontronics.com/micro-usb.html
     
  4. mike

    mike Guest

    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


    --
    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/
     
  5. Pooh Bear

    Pooh Bear Guest

    Yes.

    Graham
     
  6. Pooh Bear

    Pooh Bear Guest

    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
     
  7. mike

    mike Guest

    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


    --
    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/
     
  8. 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
     
  9. PeteS

    PeteS Guest

    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
     
Ask a Question
Want to reply to this thread or ask your own question?
You'll need to choose a username for the site, which only take a couple of moments (here). After that, you can post your question and our members will help you out.
Electronics Point Logo
Continue to site
Quote of the day

-