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

Other Hardware Displays
2

Go on. It is a simple question of putting the right statements in setup() and in loop()

void setup()
{
    Serial.begin(9600);
    //-----------------------------------
    scale.set_scale();
    scale.tare();  //Reset the scale to 0
    long zero_factor = scale.read_average();
    //---------------------------------
    tft.reset();
    uint16_t identifier = tft.readID();
    tft.begin(identifier);
    Serial.print(identifier);
    tft.setRotation(1);
    tft.fillScreen(WHITE);
    tft.setTextSize(4);
    tft.setTextColor(BLACK, WHITE);  //set back colour for rubout
}

void loop()
{
    Serial.println(scale.get_units());
    tft.setCursor(130, 100);
    tft.print(scale.get_units());
    tft.print(" ");                  //rubs out old digit
    delay(1000);                     //wait between readings
}

You seem to get different readings. It is often wise to take three or four readings and display the average.

David.