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Nextuin 3.2 Arduino Mega

Hello I buy a 3.2 Nextion I am able to work with the editor, and I understand the principle but I would like to know the plug on my Arduino Mega 2560 is 5v so the plug is the right place and connect gnd is because my screen lights up, the tx and rx have pine branches what ?? to be able to make use of demo and then to the beautiful project that is in court Thank you very much
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