Reusing an old ender3 display whit an rp2040

the name of the display is 12864zw-10 and im using the library u8g2 for controlling it im having a problem with the contrast on the display how can fix it? i see the letters but hty are very dim i have seen that exist a pin v0 that is used to change the contrast but i cant seem to find it on the board https://forum.duet3d.com/assets/uploads/files/1543808715681-24697c77-88a7-4999-9578-a28479e0d7ad-image.png

Hello @tntsimo !

With what voltage do you run the LCD?

im using 5v

Usually, the contrast is set with a pot on the LCD board.
Most 12864 boards don’t have it. And there is no possibiltiy to program that.

Can you share an image on the image during work?


bareli visible

For me, there is nothing on the display.
What you see, the shadows in the lower part, are worn out segments on the LCD.

BTW: The display is upside-down.

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there are multiple EEEEEEEEEEEEE

But is very dim

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