2.42-inch 128×64 PM OLED Display Module – White, SSD1309 Driver, I2C Interface, 3.3V, 5-Pin (GND/VCC/SCL/SDA/RES)

OLED Module          →    ESP32
─────────────────────────────────────
VCC (3.3V)           →    3.3V
GND                  →    GND
SCL                  →    GPIO22 (SCL)
SDA                  →    GPIO21 (SDA)
RES                  →    GPIO4 (with 10kΩ pull-up to 3.3V optional)

OLED Module          →    Arduino Uno
─────────────────────────────────────
VCC (3.3V)           →    3.3V pin
GND                  →    GND
SCL                  →    A5 (SCL)
SDA                  →    A4 (SDA)
RES                  →    D9 (with 10kΩ pull-up to 3.3V)

OLED Module          →    Raspberry Pi
─────────────────────────────────────
VCC (3.3V)           →    Pin 1 (3.3V)
GND                  →    Pin 6 (GND)
SCL                  →    Pin 5 (GPIO 3 / SCL)
SDA                  →    Pin 3 (GPIO 2 / SDA)
RES                  →    GPIO 17 (with 10kΩ pull-up to 3.3V)

#include <Wire.h>

void setup() {
  Wire.begin();
  Serial.begin(9600);
  Serial.println("I2C Scanner");
}

void loop() {
  byte error, address;
  int nDevices = 0;
  
  for(address = 1; address < 127; address++) {
    Wire.beginTransmission(address);
    error = Wire.endTransmission();
    
    if(error == 0) {
      Serial.print("I2C device found at address 0x");
      if(address < 16) Serial.print("0");
      Serial.println(address, HEX);
      nDevices++;
    }
  }
  
  if(nDevices == 0) Serial.println("No I2C devices found");
  delay(5000);
}

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

// Correct constructor for 2.42" 128x64 SSD1309 over I2C
// The "F" (full buffer) variant updates faster but uses more RAM
// Parameter: reset pin number (use U8X8_PIN_NONE if not connected)
U8G2_SSD1309_128X64_NONAME0_F_HW_I2C u8g2(U8G2_R0, /* reset=*/ 4);  // GPIO4 for RES

void setup() {
  // If RES is connected to a GPIO, ensure it is pulled HIGH
  pinMode(4, OUTPUT);
  digitalWrite(4, HIGH);
  
  // Initialize the display
  u8g2.begin();
  u8g2.enableUTF8Print();
  u8g2.setFont(u8g2_font_ncenB08_tr);
  
  // Optional: Set I2C address if not default
  // u8g2.setI2CAddress(0x78);  // For address 0x3C
}

void loop() {
  u8g2.firstPage();                      // Start page loop
  do {
    u8g2.drawStr(0, 15, "2.42 OLED");
    u8g2.drawStr(0, 35, "128x64");
    u8g2.drawStr(0, 55, "SSD1309 - I2C");
    u8g2.drawStr(0, 75, "White Display");
  } while ( u8g2.nextPage() );           // Transfer buffer to display
  
  delay(1000);
}

// In setup(), before u8g2.begin()
u8g2.setI2CAddress(0x7A);  // For 7-bit address 0x3D (0x7A is 8-bit)

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

#define SCREEN_WIDTH 128
#define SCREEN_HEIGHT 64
#define OLED_RESET -1   // Set to GPIO if RES connected

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

void setup() {
  display.begin(SSD1306_SWITCHCAPVCC, 0x3C);
  display.clearDisplay();
  display.setTextSize(1);
  display.setTextColor(SSD1306_WHITE);
  display.setCursor(0, 0);
  display.println("2.42 OLED");
  display.println("SSD1309 Ready!");
  display.display();
}

sudo apt-get install python3-pip
pip3 install luma.oled

from luma.core.interface.serial import i2c
from luma.oled.device import ssd1309
from luma.core.render import canvas

# I2C connection (address 0x3C, reset pin 17)
serial = i2c(port=1, address=0x3C, gpio_DC=18, gpio_RST=17)

device = ssd1309(serial, width=128, height=64)

with canvas(device) as draw:
    draw.rectangle(device.bounding_box, outline="white", fill="black")
    draw.text((10, 25), "2.42 OLED", fill="white")
    draw.text((10, 45), "128x64 Ready!", fill="white")