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'[OT]: Graphics Displays'
2001\03\08@172939 by Ashley Roll

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Hi Everyone,

I need to build an human interface for an industrial machine to control it.
The interface will use a serial port to command and query the actual
controller.

I'm trying to workout the "best" display I can get. I know I can use a 2 or
4 line LCD, but it has to be fairly large and readable so I got to thinking
about graphics displays and even touch screens.

My question is has anyone interfaced a graphic LCD or EL display to a
PIC16F8xx? If so how? I'm thinking about those 1/4 VGA displays or something
like that. If I can get graphics working that would be cool as it will allow
me to display "nice" looking stats and control state information.

If I use a graphics one, I'm expecting to need external memory and a RAMDAC
etc but I've never used that sort of thing before.. I know there used to be
simple solutions for old TV monitor based computers (ZX81, BBC micro etc).

Unfortunately, like everything, cost is a factor..

Is it possible or should I go back to a multi line text LCD. What is the
largest text LCD you can get character size I mean?

Is there a better solution? I know I could use a single board computer to do
it but that seems like overkill for what really is a text based menu
navigation thing.

Thanks for your Ideas and help.
Cheers,
Ash.

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2001\03\08@175811 by jamesnewton

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{Original Message removed}

2001\03\09@063115 by Graham Harrison

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----- Original Message -----
From: Ashley Roll <.....ashKILLspamspam@spam@DIGITALNEMESIS.COM>
To: <PICLISTspamKILLspamMITVMA.MIT.EDU>
Sent: Thursday, March 08, 2001 10:20 PM
Subject: [OT]: Graphics Displays


> Hi Everyone,
>
> I need to build an human interface for an industrial machine to control
it.
> The interface will use a serial port to command and query the actual
> controller.
>
> I'm trying to workout the "best" display I can get. I know I can use a 2
or
> 4 line LCD, but it has to be fairly large and readable so I got to
thinking
> about graphics displays and even touch screens.
>
> My question is has anyone interfaced a graphic LCD or EL display to a
> PIC16F8xx? If so how? I'm thinking about those 1/4 VGA displays or
something
> like that. If I can get graphics working that would be cool as it will
allow
> me to display "nice" looking stats and control state information.
>
> If I use a graphics one, I'm expecting to need external memory and a
RAMDAC
> etc but I've never used that sort of thing before.. I know there used to
be
> simple solutions for old TV monitor based computers (ZX81, BBC micro etc).
>
> Unfortunately, like everything, cost is a factor..
>
> Is it possible or should I go back to a multi line text LCD. What is the
> largest text LCD you can get character size I mean?
>
> Is there a better solution? I know I could use a single board computer to
do
> it but that seems like overkill for what really is a text based menu
> navigation thing.
>
> Thanks for your Ideas and help.
> Cheers,
> Ash.

I recently designed an MMI (or Human Interface) for a piece of hospital
equipment, and used a PIC16C77 to drive a large (240 x 128) graphic LCD. I
used an external EEPROM to hold all the LCD data, because of the memory
limitations of the PIC. It workd very well, and allows the PIC to also drive
8 LEDs and a 3 x 8 Keypad matrix, and interface to the host controller via
an RS232 port.

There's more info on this at

http://www.redwinter.freeserve.co.uk/lcdif.htm

regards

Graham

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