How to Use OLED: Examples, Pinouts, and Specs

The Midas MDOB128064BV-WS is a high-quality Organic Light Emitting Diode (OLED) display module. OLED technology utilizes organic compounds that emit light when an electric current is applied, eliminating the need for a backlight. This results in displays with exceptional contrast ratios, vibrant colors, and deep blacks. The MDOB128064BV-WS is a 128x64 pixel monochrome display, ideal for applications requiring clear and sharp visuals in a compact form factor.

• Wearable devices
• Industrial control panels
• Consumer electronics (e.g., smart home devices)
• Medical equipment
• Prototyping with microcontrollers (e.g., Arduino, Raspberry Pi)

The following table outlines the key technical details of the MDOB128064BV-WS OLED display:

The MDOB128064BV-WS has a standard pinout for SPI/I2C communication. Below is the pin configuration:

The MDOB128064BV-WS can be easily interfaced with an Arduino UNO using either SPI or I2C communication. Below is an example of how to connect the OLED in I2C mode:

The following Arduino sketch demonstrates how to initialize and display text on the OLED using the Adafruit SSD1306 library:

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

// Define OLED display dimensions
#define SCREEN_WIDTH 128
#define SCREEN_HEIGHT 64

// Create an instance of the SSD1306 display object
Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, -1);

void setup() {
  // Initialize serial communication for debugging
  Serial.begin(9600);

  // Initialize the OLED display
  if (!display.begin(SSD1306_I2C_ADDRESS, 0x3C)) {
    Serial.println(F("SSD1306 allocation failed"));
    for (;;); // Halt execution if initialization fails
  }

  // Clear the display buffer
  display.clearDisplay();

  // Set text size and color
  display.setTextSize(1); // Small text size
  display.setTextColor(SSD1306_WHITE);

  // Display a message
  display.setCursor(0, 0); // Set cursor to top-left corner
  display.println(F("Hello, OLED!"));
  display.display(); // Render the text on the screen
}

void loop() {
  // Nothing to do here
}

1. Power Supply: Ensure the OLED is powered within its operating voltage range (3.3V to 5V).
2. Library Compatibility: Use the Adafruit SSD1306 and GFX libraries for seamless integration.
3. Reset Pin: Connect the RES pin to a digital pin on the microcontroller for proper initialization.
4. Pull-up Resistors: For I2C communication, ensure pull-up resistors (typically 4.7kΩ) are present on the SCL and SDA lines.

1. Display Not Turning On

   • Cause: Incorrect wiring or insufficient power supply.
   • Solution: Double-check the connections and ensure the power supply is stable.

2. Garbage Data on Screen

   • Cause: Incorrect communication protocol or address.
   • Solution: Verify the I2C address (default is 0x3C) and ensure the correct protocol is selected.

3. Flickering Display

   • Cause: Insufficient current supply or loose connections.
   • Solution: Use a stable power source and secure all connections.

4. Library Initialization Fails

   • Cause: Missing or outdated libraries.
   • Solution: Install the latest Adafruit SSD1306 and GFX libraries via the Arduino Library Manager.

1. Can I use the OLED with a 3.3V microcontroller?

   • Yes, the MDOB128064BV-WS is compatible with both 3.3V and 5V logic levels.

2. What is the default I2C address of the OLED?

   • The default I2C address is 0x3C.

3. Can I use SPI and I2C simultaneously?

   • No, the OLED operates in either SPI or I2C mode, but not both at the same time.

4. How do I change the I2C address?

   • The I2C address is fixed and cannot be changed for this module.

By following this documentation, users can effectively integrate the Midas MDOB128064BV-WS OLED display into their projects for high-quality visual output.