Mini OLED display μπλε 0.91 inch 128x32 I2C

/*
 * ==================================================================
 *  Generated by Codey.online  —  https://www.codey.online
 * ==================================================================
 *  Project   : 0.91-inch I2C OLED Display Demo
 *  Board     : Arduino UNO (arduino:avr:uno)
 *  Parts     : OLED Display 0.91 inch
 *  Libraries : U8g2 2.36.19
 *
 *  Codey Online is an AI-powered browser IDE for Arduino and ESP32.
 *  Describe your project and Codey writes the code, draws the wiring
 *  diagram and uploads it to your board, straight from the browser.
 *  This code is free to use, modify and share, without warranty.
 * ==================================================================
 */

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

// 0.91" OLED display is a 128x32 SSD1306 I2C module
U8G2_SSD1306_128X32_UNIVISION_F_HW_I2C u8g2(U8G2_R0, /* reset=*/ U8X8_PIN_NONE);

unsigned long seconds = 0;

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

void loop() {
  u8g2.clearBuffer();

  // Header text
  u8g2.setFont(u8g2_font_6x10_tr);
  u8g2.drawStr(0, 10, "0.91\" OLED Demo");

  // Separator line
  u8g2.drawHLine(0, 14, 128);

  // Uptime counter
  u8g2.drawStr(0, 28, "Uptime: ");
  u8g2.setCursor(50, 28);
  u8g2.print(seconds);
  u8g2.print(" s");

  u8g2.sendBuffer();

  seconds++;
  delay(1000);
}

/*
 * ==================================================================
 *  Generated by Codey.online  —  https://www.codey.online
 * ==================================================================
 *  Project   : 0.91 Inch OLED Display with ESP32
 *  Board     : ESP32 DEVKIT V1 (esp32:esp32:esp32doit-devkit-v1)
 *  Parts     : OLED Display 0.91 inch
 *  Libraries : Adafruit SSD1306 2.5.16, Adafruit GFX Library 1.12.6
 *
 *  Codey Online is an AI-powered browser IDE for Arduino and ESP32.
 *  Describe your project and Codey writes the code, draws the wiring
 *  diagram and uploads it to your board, straight from the browser.
 *  This code is free to use, modify and share, without warranty.
 * ==================================================================
 */

#include <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>

#define SCREEN_WIDTH 128
#define SCREEN_HEIGHT 32
#define OLED_RESET -1
#define SCREEN_ADDRESS 0x3C

Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, OLED_RESET);

int counter = 0;

void setup() {
  Serial.begin(115200);

  // Initialize I2C on ESP32 default pins (SDA=21, SCL=22)
  Wire.begin(21, 22);

  if (!display.begin(SSD1306_SWITCHCAPVCC, SCREEN_ADDRESS)) {
    Serial.println(F("SSD1306 allocation failed"));
    for (;;); // Halt if OLED not found
  }

  display.clearDisplay();
  display.setTextSize(1);
  display.setTextColor(SSD1306_WHITE);
  display.setCursor(0, 0);
  display.println(F("ESP32 OLED Demo"));
  display.display();
  delay(1500);
}

void loop() {
  display.clearDisplay();
  
  display.setTextSize(1);
  display.setTextColor(SSD1306_WHITE);
  display.setCursor(0, 0);
  display.println(F("ESP32 DevKit V1"));
  
  display.setTextSize(2);
  display.setCursor(0, 14);
  display.print(F("Count: "));
  display.println(counter);
  
  display.display();

  Serial.print(F("Current count: "));
  Serial.println(counter);

  counter++;
  delay(1000);
}