I bought a 40x4 big blue LCD on Amazon, and struggled a bit to get it working until I figured it out, so figured I'd share in case it's useful to someone else! Basically, it appears as two different 20x2 units and has tWo Enable (E) lines, one for each half. The RS and RW and D4-D7 are connected no…

Info on how to use 40x4 LCD

groundFungus July 20, 2018, 3:06pm 2

Thanks for taking the time to post your solution.

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