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Forum Index : Microcontroller and PC projects : Using a VGA touchscreen with Duinomite Me

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Lopezjm2001

Regular Member

Joined: 08/07/2012
Location: Australia
Posts: 42
Posted: 04:02am 08 Jul 2012
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I am still waiting on delivery of a Duinomite Mega. I am just a newby to this forum. I would like to know if connecting a VGA LCD using a touchscreen will work. Is there a driver for a touch screen for using mmbasic? Will it work with a mouse driver? I am planning on using the Mega as a Canbus monitor for my Prius. Any comments. Thanks.
Otherwise I will have to use digital inputs via pushbuttons to navigate between pages and execute different functions.Edited by Lopezjm2001 2012-07-09
Lopez
 
darthmite

Senior Member

Joined: 20/11/2011
Location: France
Posts: 240
Posted: 06:48am 08 Jul 2012
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If it's a resistive touch screen i will use 2 ADC pin for get the X,Y coords.
No button needed.

Cheers.
Edited by darthmite 2012-07-09
Theory is when we know everything but nothing work ...
Practice is when everything work but no one know why ;)
 
Geoffg

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Joined: 06/06/2011
Location: Australia
Posts: 3194
Posted: 02:29pm 08 Jul 2012
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I have been using the touch LCDs from 4D Systems (expensive but nice).

I posted more details plus a MMBasic driver in this topic: http://www.thebackshed.com/forum/forum_posts.asp?TID=4969&KW =4d&PN=0&TPN=2

Geoff
Geoff Graham - http://geoffg.net
 
Lopezjm2001

Regular Member

Joined: 08/07/2012
Location: Australia
Posts: 42
Posted: 06:06pm 14 Jul 2012
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  darthmite said  
If it's a resistive touch screen i will use 2 ADC pin for get the X,Y coords.
No button needed.

Cheers.


It just happens that I have a 7" VGA LCD touch screen (brand is RESPONCE) which uses a four wire resistance touch screen which may be standard with most 7" touch screens. I confirmed this by measuring the resistance between the four wires ( or flat tape wires) with a DMM whilst touching the touch screen at different spots. I can disconnect the four wires from the driver board which goes to a USB plug and connect them directly to the Duinomite Mega GPIO two analogue input pins and two digital output pins. Then it is just a matter of writing a basic program to calibrate the four corners and accept the x and y coordinates.l

Thanks. Your suggestion is the best so far.Edited by Lopezjm2001 2012-07-16
Lopez
 
MicroBlocks

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Joined: 12/05/2012
Location: Thailand
Posts: 2209
Posted: 10:15pm 27 Jul 2012
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Hi Lopez,

Did you get it to work?
I have a similar screen lying around and would be interested to learn how you solved it.

Microblocks. Build with logic.
 
Lopezjm2001

Regular Member

Joined: 08/07/2012
Location: Australia
Posts: 42
Posted: 10:58pm 14 Jan 2013
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  TZAdvantage said   Hi Lopez,

Did you get it to work?
I have a similar screen lying around and would be interested to learn how you solved it.



I am getting around to it one day. It has already been done by TassyJim at the link below.

TassyJim - Small VGA Monitor Edited by Lopezjm2001 2013-01-16
Lopez
 
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