Problem at displaying sensor value in 2.8" TFT touchscreen mcufriend 0x4747

Other Hardware Displays
4

There is no fillscreen() method. Only a fillScreen()

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You do not understand setup() and loop()

You call setup() once. e.g. for tft.fillScreen(WHITE);

loop() is called repeatedly. e.g. for tft.print(scale.get_units());

David.