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Topic: Gang two hd44780 displays (Read 84 times) previous topic - next topic


I'm really new to this, so please be easy on me.
I need a 20 x 4 lcd display and I have several 20 x 2 displays on hand. Is it possible to gang two of the 20 x 2's together to effectively create a 20 x 4 display? How would you do this?

Thanks in advance


Well, clearly it will be difficult to get them sufficiently close together to appear as a 20 by 4 display but you can mount them as close as possible.

Electrically, you connect all pins together except the contrast pins which you probably want to adjust separately, and the enables which need to be driven by separate Arduino pins.  You then code two instances of the constructor with the same parameters except for the enable pins, and figure out how to code for the four effective lines which is in fact, virtually no different to coding for two lines as they do not automatically run from one to the other anyway.


Take a look at this thread: -->  http://forum.arduino.cc/index.php/topic,5014.0.html

Be sure to scroll down to the pictures.



Thanks for the link. That is exactly what I want to do.

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