NodeMCU with buil-in OLED display

Other Hardware Displays
1

I have NodeMCU 1.0 (ESP-12E Module) with built-in OLED display. It was bought on Aliexpress a several years ago.

In a device it is written that it has ESP8266MOD chip.

I am using Arduino IDE 2.3.4 where I set board as NodeMCU 1.0

Board info says:
BN: Unknown board
VID: 0x10c4
PID: 0xea60
SN: 0001

Now my problem... I want to write something on this OLED display, but it is blank. I tried to upload a .bin file from Deauther, and in that case I can see text on OLED. So OLED is working! Just my code is wrong.

First I ran I2C scanner and it says there are no I2C devices. Then I found out it is SPI screen, because the code below prints out that OLED SPI Display is initialized.

Here is my code:

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

#define OLED_MOSI   D7  // GPIO13
#define OLED_CLK    D5  // GPIO14
#define OLED_DC     D4  // GPIO2
#define OLED_CS     D8  // GPIO15
#define OLED_RESET  D3  // GPIO0

Adafruit_SSD1306 display(128, 64, &SPI, OLED_DC, OLED_RESET, OLED_CS);


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

  delay(1000);
  Serial.println("NodeMCU 1.0 (ESP-12E Module)");  // Print text

  // Initialize build-in LED
  pinMode(LED_BUILTIN, OUTPUT);

  // Initialize OLED display with the correct resolution
  if (!display.begin(SSD1306_EXTERNALVCC, 0x3D)) {
    Serial.println("OLED SPI display not found!");
    while (true);  // Stay here if display not found
  }
 
  Serial.println("OLED SPI Display Initialized!");

  display.clearDisplay();  // Clear the display

  display.setTextSize(3);  // Set larger text size for better visibility
  display.setTextColor(WHITE);  // Set text color to white
  display.setCursor(1, 1);  // Set cursor position for better alignment

  display.println("TEST!");  // Print text
  display.display();  // Show the content on the display
}

void loop() {
  Serial.println("My first test");  // Print text
  digitalWrite(LED_BUILTIN, LOW);  // LED ON
  delay(1000);
  digitalWrite(LED_BUILTIN, HIGH); // LED OFF
  delay(1000);
}

Device blinks internal LED diode, I can see output in serial console, but OLED display is blank.

This are the pictures of a device:

IMG_20250203_220349_919
IMG_20250203_220349_9191920×2560 282 KB

IMG_20250203_220442_068
IMG_20250203_220442_0681920×2560 270 KB

Any idea how to solve this? I suspect that OLED_MOSI, OLED_CLK, etc. values could be wrong, but I have no idea how to find out the correct values...

Edit: there was a problem uploading pictures, I repaired that.

2

Welcome to the forum.

Have you checked out How to Set Up NodeMCU ESP8266 with 0.96 Inch OLED Display | Beginner Tutorial?

3

Yes. It compiles, can upload it to board, but the screen is blank.

4

I guess I don't have correct SDA and SCL pins defined... How to find out which are correct for my board?

5

Ah, stupid me. It is written on the board. Thanks for pointing me into right direction. Problem solved.

6

:+1:

7

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