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Do you have a datasheet that came with this LCD?
Google doesn't seem to like <optrex 81852>.
Have you looked at the examples I posted for graphic LCDs? Maybe one example might give you insight on how to use the commands if you ever find the datasheet.
My Creality Ender 3 S1 Plus is a giant paperweight that can't even be used as a boat anchor, cause I'd be fined for polluting our waterways with electronic devices.
Not as dumb as yesterday, but stupider than tomorrow!
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