Re: [OT] Possible bulk buy on 128 by 64 graphic displays with touch screen

[ian.bird@xxxxxxxxxxxxxx]

Hi Paul

It is not quite that simple. You will need some glue in the middle.
Typically this may be a PIC or similar as these applications tend to be
embedded.

The parallel bit is the way of communicating with the LCD chip. Actually
it can talk by both serial and parallel (no relation to the PC versions).
My implementation is parallel as it is quicker for a given clock speed. In
parallel mode there are 13 i/o lines including 8 for data, reset, clock
and some others. This requirement can be reduced by using it in serial
mode. At a guess you would lose the requirement for 7 lines so about 6
lines would be needed. On top of that your PIC would need a serial port to
receive the data from the touch screen. The PIC would then do all the
magic and print stuff on the screen. If you had switches the PIC would
monitor these and send something back to the host on the other end of the
MSS100.

To enable it to receive from an MSS100 you would need a PIC with two
serial ports, one for the touch screen and one for the MSS100. Some
programmatic glue in there and you are most of the way there. Whilst it
would be possible to convert the C routines I have into assembler I would
recommend using a C compiler for the PIC or similar.

I am actually doing this except I have a 10 base T Ethernet presentation
so plug in the RJ45 directly and off you go. I do not intend to offer this
as a solution however because no-one would be able to work with it as I
have made the compiler and chip choice.

Any more questions fire away

Thanks

Ian








"Paul Robinson" <ukcueman@xxxxxxx>
Sent by: ukha_d@xxxxxxx
07/11/2005 13:08
Please respond to ukha_d


To:     <ukha_d@xxxxxxx>
cc:     (bcc: Ian Bird/CV/Novartis)
Subject:        Re: [ukha_d] [OT] Possible bulk buy on 128 by 64 graphic
displays with
touch screen


Is it practical to use this remote from a PC? Can't be a simple MSS100 to
give it ethernet
because you're talking about serial+parallel access, but what about 20-30m
of cat5?

----- Original Message -----
From: <ian.bird@xxxxxxx>
To: <ukha_d@xxxxxxx>
Cc: <ian@xxxxxxx>
Sent: Monday, November 07, 2005 5:06 PM
Subject: [ukha_d] [OT] Possible bulk buy on 128 by 64 graphic displays
with touch screen


> Hi all
>
> I am looking at buying some of these (see below) touch screen displays
> from Apollo for a project I am working on but the supplier has upped
the
> minimum order quantity to 1000 pounds plus VAT and delivery. This is a
> little more than I wanted to spend so I am looking to share the
burden.
>
> The displays are available in either blue/white mode or amber/dark
blue
> mode. They have a 4 wire resistive touch screen pre bonded onto them.
You
> can see the non touchscreen version in action at the beginning of the
last
> UKHA video. You can get a taster of the work I will do from this page
> although there are no details of the touch controller chip on there.
>
> http://www.mollyology.com/ProjectsGraphicDisplayInterface.php
>
> I am thinking it would be best to sell these on with the touch
controller
> and other hardware fitted onto a small daughter board otherwise
> interfacing would be problematic for most. I would bring out the
> connectors to standard headers unless anyone wanted something
different.
> The PCB's would be professionally produced - not home made.
>
> Here is the link to the suppliers page about the screens
>
> http://www.apollodisplays.co.uk/51553.php
>
> This would mean anyone could get into really neat touch screens for
their
> home made devices at relatively low cost.
>
> I also have some C code to talk to these units using the parallel
> interface as well as a library of functions for circles, ovals, lines,
> rectangles, text, custom characters and pictures which I will share.
The
> code is written for the AVR CodeVision C compiler but should be pretty
> portable. I ported some of it from another compiler in the first place
> anyway.
>
> The touch screen outputs the touch coordinates with a T prefix
followed
by
> two 4 digit comma separated sets of coordinates. A release action
sends
> the same string but the prefix is an R e.g. T0123,0232 or R0212,0232.
> Coordinates are sent across a serial link at 9,600 or 19,200 as long
as
> the screen is being pressed. This enables dragging to be supported if
you
> are really keen.
>
> If anyone is interested please mail me at ian at mollyology dot com or
on
> list if applicable.
>
> I would expect the screen, associated electronics and PCB completely
> assembled and tested to be about 50 to 60 quid. I am not making any
money
> out of this, just breaking even. I simply cannot afford the have 1200
> quids worth of screens sitting on the bench for the next year or two
until
> I complete my current rather complex project.
>
> I am not knocking the LCD shop or other sources of screens but I do
> believe these prices compare very favourably with lesser screens e.g.
the
> 20 by 4 line display Keith mentioned earlier at 20 pounds in single
> quantities. They are simpler to interface but have no touch screen
option
> and are far less versatile.
>
> As always, feedback and suggestions welcome.
>
> Thanks
>
> Ian




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