ESP32 Forum

Posted: **Sat Sep 06, 2025 2:24 pm**

Hello,
I ordered an ESP32 board with a built-in OLED.
It hasn't arrived yet. Does anyone know this board?
https://de.aliexpress.com/item/10050073 ... pt=glo2deu
Can it be controlled with the Arduino software?
Does anyone have a sample code?
Thank you very much.
Hans

Posted: **Sat Sep 06, 2025 5:49 pm**

For boards like the WeMos Lolin32 OLED, the built-in OLED uses GPIO 5 (SDA) and GPIO 4 (SCL), not the ESP32's default I²C pins (21 & 22)
Your code should explicitly set up I²C to use the board's pins:

Code: Select all

#include <Wire.h>
Wire.begin(5, 4);  // SDA = 5, SCL = 4

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

#define SCREEN_WIDTH 128
#define SCREEN_HEIGHT 64

Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, -1);

void setup() {
  Wire.begin(5, 4);

  if (!display.begin(SSD1306_SWITCHCAPVCC, 0x3C, false, false)) {
    Serial.println(F("OLED init failed"));
    while (1);
  }
  display.clearDisplay();
  display.setTextSize(1);
  display.setTextColor(WHITE);
  display.setCursor(0,0);
  display.println("Hello, ESP32 OLED!");
  display.display();
}

void loop() {
}

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