Interfacing with Touchscreen LCD - Electronic Circuits Projects Diagrams Free

baberjaved · 7th September 2007, 08:25 PM

Anyone gots information on how can I interface a PIC to a Touchscreen LCD (Resistive or capacitive I dun know the difference.. explanation?)
Is it really hard and a complex procedure or easy enough as interfacing an mmc card?

Ambient · 7th September 2007, 11:39 PM

I imagine you will need to find a touch screen to work with first. The data sheet for it will give you all the code you need.

Sceadwian · 8th September 2007, 12:19 AM

Resistive touch screens are pretty easy to interface with, There are four nodes, you apply a voltage to two specific nodes and read from either one of the remaining two which forms a voltage dividier giving you an analog voltage of the position on screen. You do this twice energizing different nodes and reading from the third to get either the X or Y axis. Capacitvie touch screens are much more complicated and I don't think it's practical to do it with a PIC directly, you're likley going to need a specific Ic for it.

flemmard · 8th September 2007, 03:07 AM

Quote:

Originally Posted by Sceadwian

Resistive touch screens are pretty easy to interface with, There are four nodes, you apply a voltage to two specific nodes and read from either one of the remaining two which forms a voltage dividier giving you an analog voltage of the position on screen. You do this twice energizing different nodes and reading from the third to get either the X or Y axis. Capacitvie touch screens are much more complicated and I don't think it's practical to do it with a PIC directly, you're likley going to need a specific Ic for it.

How much is the cost of touchscreen LCD? How do I program for my actions?
Any SDKs?

simrantogether · 8th September 2007, 07:40 AM

Hi,

that's good if you are attempting things like this...

but i suggest you to go step by step..

step 1: read this.. http://en.wikipedia.org/wiki/Touchscreen

step 2: read application notes of microchip or anything you prefer..

Regards,

Simran..

Sceadwian · 8th September 2007, 09:14 PM

Check out Sparkfun electronics, I thought I saw an LCD module that has a resistive touch screen. The touch screens can actually be added to just about anything, it's just a clear sheet. Again I'm not much help there though as I have no idea where to get just the plain sheeting.

Tim_B · 9th September 2007, 10:17 AM

Have a look at this http://www.sfcompiler.co.uk/wiki/pmw...er.TouchScreen

firewater · 12th September 2007, 07:09 PM

Very good link Tim B, thanks

baberjaved, you didn't say what size you're looking for or your budget but if you want a built in library then Comblock makes one that uses basic.They start at $359 US and have forums for help.
Touch screen in five minites:
http://cubloc.com/phpBB2/viewtopic.p...55c1b241df9530

http://www.comfiletech.com/index.asp...TS&Category=14

Crystalfontz makes a grey scale 320x240 4-wire resistive touchscreen for $122 US. It has a built in Epson S1D13700 controller with 32 KB of SRAM.They also have forums for your questions.MicroTips also has a 320 X 240 blue or blue/green backlit for $73.50 http://www.mouser.com/search/refine....G-F32240BFWNEB+ Texas instruments controller chip for $3.65 http://www.mouser.com/search/refine....t=595-ADS7843E

Crystalfontz:Model CFAG320240CX

http://www.crystalfontz.com/products...320240CXTFHTTS

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7th September 2007, 08:25 PM	(permalink)
baberjaved	Interfacing with Touchscreen LCD Anyone gots information on how can I interface a PIC to a Touchscreen LCD (Resistive or capacitive I dun know the difference.. explanation?) Is it really hard and a complex procedure or easy enough as interfacing an mmc card?

7th September 2007, 11:39 PM	(permalink)
Ambient	I imagine you will need to find a touch screen to work with first. The data sheet for it will give you all the code you need.

8th September 2007, 12:19 AM	(permalink)
Sceadwian	Resistive touch screens are pretty easy to interface with, There are four nodes, you apply a voltage to two specific nodes and read from either one of the remaining two which forms a voltage dividier giving you an analog voltage of the position on screen. You do this twice energizing different nodes and reading from the third to get either the X or Y axis. Capacitvie touch screens are much more complicated and I don't think it's practical to do it with a PIC directly, you're likley going to need a specific Ic for it. __________________ "Because I be what I be. I would tell you what you want to know if I could, mum, but I be a cat, and no cat anywhere ever gave anyone a straight answer, har har."

8th September 2007, 07:40 AM	(permalink)
simrantogether	Well.. Hi, that's good if you are attempting things like this... but i suggest you to go step by step.. step 1: read this.. http://en.wikipedia.org/wiki/Touchscreen step 2: read application notes of microchip or anything you prefer.. Regards, Simran.. __________________ Simran.. 8051 Specialist..

8th September 2007, 09:14 PM	(permalink)
Sceadwian	Check out Sparkfun electronics, I thought I saw an LCD module that has a resistive touch screen. The touch screens can actually be added to just about anything, it's just a clear sheet. Again I'm not much help there though as I have no idea where to get just the plain sheeting. __________________ "Because I be what I be. I would tell you what you want to know if I could, mum, but I be a cat, and no cat anywhere ever gave anyone a straight answer, har har."

9th September 2007, 10:17 AM	(permalink)
Tim_B	Have a look at this http://www.sfcompiler.co.uk/wiki/pmw...er.TouchScreen

12th September 2007, 07:09 PM	(permalink)
firewater	Very good link Tim B, thanks baberjaved, you didn't say what size you're looking for or your budget but if you want a built in library then Comblock makes one that uses basic.They start at $359 US and have forums for help. Touch screen in five minites: http://cubloc.com/phpBB2/viewtopic.p...55c1b241df9530 http://www.comfiletech.com/index.asp...TS&Category=14 Crystalfontz makes a grey scale 320x240 4-wire resistive touchscreen for $122 US. It has a built in Epson S1D13700 controller with 32 KB of SRAM.They also have forums for your questions.MicroTips also has a 320 X 240 blue or blue/green backlit for $73.50 http://www.mouser.com/search/refine....G-F32240BFWNEB+ Texas instruments controller chip for $3.65 http://www.mouser.com/search/refine....t=595-ADS7843E Crystalfontz:Model CFAG320240CX http://www.crystalfontz.com/products...320240CXTFHTTS Last edited by firewater; 12th September 2007 at 07:28 PM.