LCD display Size question

Archiver

Can anyone tell me whats the biggest LCD Display I can interface with
the BS2.. can I go 800x600?? And whats some good links for source Code,,
or do we post it here.??

---

Original Message

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From: leharker [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=8nGjhHFkHbAjETs0tN14m0WK5gtfNxe4Qh6YtOvl27PUqgSF6u86RY-tZWevgwnls3nrYTx49HD87rM]harker@a...[/url
Sent: Tuesday, August 26, 2003 3:59 PM
To: basicstamps@yahoogroups.com
Subject: [noparse][[/noparse]basicstamps] LCD display question

Hi Stampers,
I am having difficulty using a very common 16X2 LCD display with a
BS2P.
The model is Optrex DMC16207 from Digi-Key. I have used this model
before without trouble but now with my BS2P and using the LCDOUT
command I'm having trouble.
All of the info I've read about these displays references the HD44780
controller but this new one has a Samsung controller. I have tried my
design using an old 4X20 line display with the HD44780 controller and
it works fine displaying in the first 2 lines. I find that when I use
the LCDOUT command with included cursor positioning data, the
positioning doesn't happen. If I send two seperate commands one for
positioning and the next for the text, it works O.K.
Has anyone else ran across this phenomena. I am guessing that the
Samsung chip is not fast enough to keep up with the BS2P. Can someone
tell me if I may be on the right track?

Thanks


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Archiver

In a message dated 8/27/2003 8:10:29 AM Eastern Standard Time,
subrian@m... writes:


> Can anyone tell me whats the biggest LCD Display I can interface with
> the BS2.. can I go 800x600?? And whats some good links for source Code,,
> or do we post it here.??
>

I am running a 3-digit dispay with 1.36" digits.

Sid Weaver
W4EKQ
Port Richey, FL


[noparse][[/noparse]Non-text portions of this message have been removed]

Archiver

The most practical large display I've seen is:
http://www.parallax.com/detail.asp?product_id=30053

This is the 'Amulet Easy GUI' interface. It's
a 5.7" diagonal, "1/4 VGA" (whatever that means),
monochrome display. $299.00. It's also
touch-sensitive.

To manage that much space, and the touch-screen, with
a BS2 requires lots of off-BS2 horsepower -- which the
Amulet seems to have.

See www.parallax.com, click on 'accessories', and select
Audio Visual. There's a complete selection there, at
a wide range of prices.

Other large displays are:
1. 4 line by 40 character, driven by Hitachi 44780 chip.
2. 120 x 32 pixel graphics display ($109.00)
3. 4 line by 20 character, parallel, Hitachi 44780 ($39.00)

Issues with large, bit-mapped LCD displays are:
1. Cost. Most of the cost of a laptop IS the display.
2. Memory use. An 800x600 LCD requires
(800 x 600 == 480,000) 480 KBits (60,000 bytes) to do a
refresh. This means you'll need some off BS2 memory
storage, OR some off-BS2 interface to translate a few
serial characters into the display bit-map characters.
3. Power. Multiple voltages sometimes needed.
4. Throughput. The BS2 doesn't run fast enough to
refresh an 800x600 LCD in real time.

Solutions: Most people use 'character' oriented displays
with the BS2. If you want to get fancy, you can use the
small 'graphic' (120 x 32 pixel) displays. And if you
really want to get very fancy, the Amulet is there.

--- In basicstamps@yahoogroups.com, "Brian E Boothe" <subrian@m...>
wrote:
> Can anyone tell me whats the biggest LCD Display I can interface
with
> the BS2.. can I go 800x600?? And whats some good links for source
Code,,
> or do we post it here.??
>
>
>

---

Original Message

---

> From: leharker [noparse][[/noparse]mailto:harker@a...]
> Sent: Tuesday, August 26, 2003 3:59 PM
> To: basicstamps@yahoogroups.com
> Subject: [noparse][[/noparse]basicstamps] LCD display question
>
> Hi Stampers,
> I am having difficulty using a very common 16X2 LCD display with a
> BS2P.
> The model is Optrex DMC16207 from Digi-Key. I have used this model
> before without trouble but now with my BS2P and using the LCDOUT
> command I'm having trouble.
> All of the info I've read about these displays references the
HD44780
> controller but this new one has a Samsung controller. I have tried
my
> design using an old 4X20 line display with the HD44780 controller
and
> it works fine displaying in the first 2 lines. I find that when I
use
> the LCDOUT command with included cursor positioning data, the
> positioning doesn't happen. If I send two seperate commands one for
> positioning and the next for the text, it works O.K.
> Has anyone else ran across this phenomena. I am guessing that the
> Samsung chip is not fast enough to keep up with the BS2P. Can
someone
> tell me if I may be on the right track?
>
> Thanks
>
>
> To UNSUBSCRIBE, just send mail to:
> basicstamps-unsubscribe@yahoogroups.com
> from the same email address that you subscribed. Text in the
Subject
> and Body of the message will be ignored.
>
>
> Your use of Yahoo! Groups is subject to
> http://docs.yahoo.com/info/terms/

Archiver

Its not really the size of the LCD that is the problem, its learning how to
talk to that LCD that can be difficult.

Smaller character LCDs are easy because everyone and their dog knows how to
talk to the controllers for them. Examples are all over the place. Graphics
LCDs use different controllers and examples are much harder to find. So hard
in fact that your best bet is to see which controllers you can find
datasheets and examples for, then attempting to buy an LCD using that
controller. Unless of course you're adept at reading datasheets and timing
diagrams, then just try to find a datasheet.

The T6963 controllers are fairly common and there are many examples in C or
Assembly, haven't seen any for pbasic though - not saying they don't exist,
just that I haven't seen any (I haven't really looked either).