OLED Display Noise problem

[LinkMTech]

Hi,

I would suggest writing to the LCD only when you need to update the display info.
Constantly writing to it in a loop without any kind of delay may be causing the problem.

pause 500
                        
lcdout $FE,$28
lcdout $FE,$17
lcdout $FE,$06
lcdout $FE,$08
lcdout $FE,$01
lcdout $FE,$02
lcdout $FE,$0C
lcdout $FE,$80,"BU BiR DENEMEDiR"
LCDOUT $FE,$C0,"  iKiNCi SATIR  "


Main:
 Do stuff
 IF something_new THEN Update_LCD

GOTO Main


Update_LCD:

 lcdout $FE,$80,"BU BiR DENEMEDiR"
 LCDOUT $FE,$C0,"  New data  "

GOTO Main

[gunayburak]

Hi,

I would suggest writing to the LCD only when you need to update the display info.
Constantly writing to it in a loop without any kind of delay may be causing the problem.

pause 500
                        
lcdout $FE,$28
lcdout $FE,$17
lcdout $FE,$06
lcdout $FE,$08
lcdout $FE,$01
lcdout $FE,$02
lcdout $FE,$0C
lcdout $FE,$80,"BU BiR DENEMEDiR"
LCDOUT $FE,$C0,"  iKiNCi SATIR  "


Main:
 Do stuff
 IF something_new THEN Update_LCD

GOTO Main


Update_LCD:

 lcdout $FE,$80,"BU BiR DENEMEDiR"
 LCDOUT $FE,$C0,"  New data  "

GOTO Main

Thanks for your response .But what if I need to display some sort of ADC reading which requires an instant update on the lcd continuously ?? You know how fast those readings may change ...

[LinkMTech]

You can only "see" so fast before it becomes a blur.
Try adding a PAUSE 33 in your main loop as it is, making it 30fps, just to test if the ghost dots go away.

[gunayburak]

You can only "see" so fast before it becomes a blur.
Try adding a PAUSE 33 in your main loop as it is, making it 30fps, just to test if the ghost dots go away.

Tried but still no luck

[Jerson]

Have you got your decoupling capacitors on board?

[gunayburak]

Have you got your decoupling capacitors on board?

Yes I have tried a several values of capacitors even those large capacitors around 470uf and smaller ones and also together but it doesn't help ..

[pedja089]

Try something like this

pause 500
                        
lcdout $FE,$28
lcdout $FE,$17
lcdout $FE,$06
lcdout $FE,$08
lcdout $FE,$01
lcdout $FE,$02
lcdout $FE,$0C

lcdout $FE,$80,"BU BiR DENEMEDiR"
LCDOUT $FE,$C0,"  iKiNCi SATIR  "

Main:
GOTO Main

And remove everything from board except power supply, PIC and LCD. Add 10uF, 100nF, 10nF capacitors to LCD power pins, preferably use SMD.
If problem still persist then problem is in LCD. Or it can be "dirty" power supply. You didn't post schematic, so...

You said that you need to display data as fast as possible. If that is really what you need, then use 7 segment led display. And you can get 3-4K FPS, but then you need super human to read that.
If only regular humans will read display then more then 4 or 5 updates is more then enough.
Look at multimeter Display Digital: 6,000 counts, updates 4 per second
http://en-us.fluke.com/products/digi...html#techspecs