2.4 inch OLED Display I2C 3.3V

#include <Wire.h>
#include <U8g2lib.h>

// 2.4 inch OLED Display I2C 3.3V
// Arduino Uno uses SDA on A4 and SCL on A5.
// This example uses the common U8g2 library with a widely supported SH1106/128x64-style setup.

U8G2_SH1106_128X64_NONAME_F_HW_I2C u8g2(U8G2_R0, U8X8_PIN_NONE);

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

  u8g2.clearBuffer();
  u8g2.setFont(u8g2_font_6x12_tr);
  u8g2.drawStr(0, 14, "Hello, OLED!");
  u8g2.drawStr(0, 30, "Arduino Uno I2C demo");
  u8g2.drawStr(0, 46, "2.4 inch OLED 3.3V");
  u8g2.sendBuffer();

  Serial.begin(9600);
  Serial.println("OLED initialized and text drawn.");
}

void loop() {
  static unsigned long counter = 0;
  static unsigned long lastUpdate = 0;

  if (millis() - lastUpdate >= 1000) {
    lastUpdate = millis();
    counter++;

    char line[24];
    snprintf(line, sizeof(line), "Seconds: %lu", counter);

    u8g2.clearBuffer();
    u8g2.setFont(u8g2_font_6x12_tr);
    u8g2.drawStr(0, 14, "Hello, OLED!");
    u8g2.drawStr(0, 30, "Arduino Uno I2C demo");
    u8g2.drawStr(0, 46, line);
    u8g2.sendBuffer();

    Serial.println(line);
  }
}