lcd scrolling

[siliconchip]

hi all im experimenting with the scroll function using a 2 x 16 lcd, i have got my message going from right to left as intended but the characters when scrolling are not clear, in flowcode it appears ok but when using on a real lcd the results are not impressive, can anyone help please

[Enamul]

Hi
I have posted here quite a lot of scrolling example for different type of LCD. You can follow this thread I guess you will get your answer..
http://www.matrixmultimedia.com/mmforum ... 46&t=10932
But if you are looking for anything different let us know.

[Enamul]

Hi
It's behavior should be close to simulation behavior..

[medelec35]

Hi siliconchip,
I loaded your flowchart on to my hardware and the wording looked clear to me.
However the starting values placed into LCD I did not agree with.
You started cursor with xposition x = 0
If scrolling from right I would start the cursor with x = 15 since 15 is the last position on the right of LCD.
Can you try attached flowchart please.
you will need to connect a variable resistor to AN0
Altering resistance will alter the scrolling delay from 100ms to nealy 500 ms.
The value of delay is scrolled on the bottom line.
Message will be constantly scrolling.

LCD Scroll2.png

(8.92 KiB) Downloaded 2608 times

Just alter the pot until your happy with the scrolling speed.
Then the delay shown on LCD can be used as a fixed delay and ADC component can be removed if desired.

Martin

Edit: A post was made while typing this reply out. Sorry if information is repeated.

[siliconchip]

hi guys thanks for the replys, martin ive tried your flowcode file but im getting the same results the best way to describe it is that when scrolling takes place alot of the letters go from white to a redish colour and as they scroll you can make out what it says but it looks terrible, my display is blue with white lettering is it the display im using ???

[medelec35]

I tried on my hardware which is EB005 Eblock:
http://www.matrixmultimedia.com/product.php?Prod=EB005

Display scrolls with no issues at at all.

I did have a Blue LCD display with white characters. I will see if I can find that and give it a try

[Enamul]

Please post a picture if possible

[siliconchip]

ive tried too upload a pic but its too large i also atached it to a word document but this will not upoload either

[Enamul]

Hi
You can open the picture in paint and save as Jpeg. Size will be small

[medelec35]

ive tried too upload a pic but its too large

Hi siliconchip
What I do is load the image in paint. Paint in Windows 7 has a crop function.
Crop the picture so only necessary part is shown.
save as png.
If size is still too large, paint also has a Resize function.

Using this method I have uploaded full screen shots on these forums in the past.

Martin

Edit Sorry post crossed.
I should learn to type faster

[Enamul]

It's OK Martin.

[medelec35]

It's OK Martin.

@siliconchip
I have tried using lighted Blue background and white Chars.
I have to agree with you. The slower the clearer, but its is rubbish at scrolling!
I have posted a LCD scroll function, not using the scroll components in the past. Tried that with this LCD and its the same.
The LCD display i'm using is Displaytech 162:
http://www.compart.pl/Portals/0/pdf/lcd ... es-v11.pdf

I will see if I can improve the scrolling display, but I don't feel that confident.
With standard black on grey, scrolling is perfect.

I guess it could have something to do with the brightness and persistence of vision?

[siliconchip]

ok martin i guess now you have witnessed it that its pointless trying to post a pic, i would be interested if you could find any solutions failing that i shall have to aquire some new LCDs