I've used the matrix type. It works just like a
keypad.

Friendly Regards

Octavio Nogueira
===================================================
nogueira@propic2.com                  ICQ# 19841898
ProPic tools - low cost PIC programmer and emulator
http://www.propic2.com
===================================================

----- Original Message -----
From: Peter Betts <ext-peter.betts@NOKIA.COM>
To: <PICLIST@MITVMA.MIT.EDU>
Sent: Tuesday, July 04, 2000 1:25 PM
Subject: [PIC]: Touch Screens


> Anybody used a touch screen before over an LCD display? Got any interface
> PIC code?
>
> I think they are resistive arrays which you power up the X direction (5V)
> and read the voltage off the Y row. Like a potential divider and then turn
> the power off X and apply to Y and read the X coordinate (or voltage) off
> the X rail.
>
> I think it just needs a careful setup of the A/D input of a 16F877 or
> similar and calibrate the top left and bottom right corners to map onto
the
> LCD display underneath.
>
> Has anybody done this or can guide me away from any potential pitfalls?
>
> Pete
>
> --
> http://www.piclist.com hint: To leave the PICList
> mailto:piclist-unsubscribe-request@mitvma.mit.edu
>

--
http://www.piclist.com hint: To leave the PICList
mailto:piclist-unsubscribe-request@mitvma.mit.edu