I have been playing around with this library the past few days. Is it possible to scroll a single like of text without effecting previously output text? I tried leftToRight() and rightToLeft(), but they don’t seem to do what I’m looking for. Thanks.
The LCD controller can inherently shift the entire display either left or right one character at a time. For some unknown reason this feature has been renamed by the Arduino folks and has been implemented by the scrollDisplayLeft() and scrollDisplayRight() functions. Note that they shift both lines together for a two line display and all four lines together for a four line display. It is possible to make it look like only one line is shifting by using the appropriate function to shift the entire display and then by rewriting the lines that you didn't want to shift.
Don