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LCD 2x16 problem



if my lcd 2x16 display displays blocks on the first line, does that mean my display is f***cked up?


That happened to me and it was because it was wired incorrectly and was not initialized :slight_smile:


actually, blocks can also be a sign of contrast too high. Have you tried playing around with that? And are we talking home-made LCD or a commercial shield? if home made, make sure you take pin 4 (RS) to GND.


A 2x16 LCD un-initialized only shows the top line blocked out.

If both lines are blocked out Its either contrast too high or your writing 0xFF to every location.

Cheers Ian