#include <U8g2lib.h>

U8G2_SSD1306_128X64_NONAME_F_HW_I2C u8g2(U8G2_R0, /* reset=*/ U8X8_PIN_NONE);  // No reset pin used

void setup(void) {
  u8g2.begin();
}

void loop(void) {
  u8g2.clearBuffer();          // Clear the internal memory
  u8g2.setFont(u8g2_font_ncenB08_tr); // Choose a suitable font
  u8g2.drawStr(0, 10, "Hello World!"); // Write "Hello World!" to the display
  u8g2.sendBuffer();          // Transfer internal memory to the display
  delay(1000);  
}