7inch Display + Get values from Arduino

Hello! i have this 7inch elecrow display connected to my Arduino Mega, and its also connected to a Barcode scanner, the scanner is saving the number in a variable, how can i make the Elecrow display a stored variable from an Arduino?

i would love to discuss HMI interface later when i get this "Display arduino variable on Elecrow Display" done, like how to make a GUI display the number in a nice font.


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