It is not practical to do a smooth vertical scroll on display. Even if you use half and quarter height custom characters the gap between the first and the second line is bigger than that between characters.
You can copy the second line to the first line, then write a new second line and repeat the entire process with a pause. This would let you display much more info on that tiny LCD. However a graphic LCD would be a better option if you have enough room.
Regards
Sougata
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