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I had some issues with the instructions. It took me a while to figure out that the two instructions: void setup and void loop were both trying to right onto the display.once you comment one of them out, then it works beautifully.One more thing I'd like to add is that the BL+and BL-(two last pins in the lcd display) don't need to be connected. In fact I think it would be better to use the potentiometer to control the background light.
Arduino Nano: Directly connected 2 X 16 LCD Display With Visuino
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