Datasheet

processors can use the "Option 1" version of the constructor for best performance:

Mega and Leonardo users should use the "Option 2" version of the constructor for compatibility:

Be sure to select only one option and comment out the other with a pair of //'s.

Now upload the sketch to see the graphical display!

Adafruit_ST7735 tft = Adafruit_ST7735(TFT_CS, TFT_DC, TFT_RST);

Adafruit_ST7735 tft = Adafruit_ST7735(TFT_CS, TFT_DC, TFT_MOSI, TFT_SCLK, TFT_RST);