OLED (128×64)

#include <U8g2lib.h>
#include <Wire.h>
U8G2_SSD1306_128X64_NONAME_1_HW_I2C OLED(U8G2_R0, U8X8_PIN_NONE);
void setup(void) {
  OLED.begin();
}
void loop(void) {
  OLED.setFont(u8g2_font_ncenB14_tr);
  OLED.firstPage();
  do {
    OLED.setCursor(0, 40);
    OLED.print(F("Hello World!"));
  } while ( OLED.nextPage() );
  delay(1000);
}