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Topic: run an 5v hd44780 compatible LCD with 3,3v? (Read 2016 times) previous topic - next topic



I got a bunch of hd44780 compatible LCDs which are designed to run on 5v. I'd like to use them with an 3,3v arduino clone. It seems the logic takes the 3,3 v without a problem, but the characters are barely visible because the 3,3 v are not enouth for readable contrast (you got to tie pin 3 to ground for contrast)

What would be an easy solution for this problem? I don't want to get 3,3 v displays because I'd like to use the one I have and besides that their orange is so beautiful ;)

any hint is very appreciated :)


A link to the datasheet would be helpful. 

(you got to tie pin 3 to ground for contrast)

Normally you feed pin 3 with a small positive voltage via a potentiometer.  Does this mean that you haven't used a potentiometer or that the setting that gives 0V at the contrast pin is the best?  You could try a slightly negative contrast voltage.


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