How to Use DisplaySmall: Examples, Pinouts, and Specs

The DisplaySmall is a compact display module designed for applications requiring a small form factor. It is ideal for portable devices, embedded systems, and projects where space is limited but visual output is essential. This module is versatile and can display text, numbers, and simple graphics, making it a popular choice for hobbyists and professionals alike.

• Portable electronic devices
• Wearable technology
• IoT (Internet of Things) projects
• Embedded systems
• Prototyping and DIY electronics
• Arduino and microcontroller-based projects

Below are the key technical details for the DisplaySmall module:

The DisplaySmall module has a 4-pin interface for easy integration with microcontrollers. Below is the pinout:

1. Power Connection: Connect the VCC pin to a 3.3V or 5V power source and the GND pin to the ground.
2. I2C Communication: Connect the SCL and SDA pins to the corresponding I2C pins on your microcontroller. For an Arduino UNO:
   • SCL connects to A5.
   • SDA connects to A4.
3. Pull-Up Resistors: Ensure that the I2C lines (SCL and SDA) have pull-up resistors (typically 4.7kΩ to 10kΩ) if not already included on the module.

• Voltage Compatibility: Verify that your microcontroller operates at a compatible voltage (3.3V or 5V).
• I2C Address: The default I2C address for the module is typically 0x3C. Check the datasheet or test if the address differs.
• Initialization: Use a compatible library (e.g., Adafruit SSD1306 or U8g2) to initialize and control the display.
• Avoid Overheating: Operate the module within the specified temperature range to prevent damage.

Below is an example of how to use the DisplaySmall module with an Arduino UNO using the Adafruit SSD1306 library:

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

// Define the screen width and height
#define SCREEN_WIDTH 128
#define SCREEN_HEIGHT 64

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

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

  // Initialize the display
  if (!display.begin(SSD1306_I2C_ADDRESS, 0x3C)) {
    Serial.println(F("Display initialization failed!"));
    while (true); // Halt execution if initialization fails
  }

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

  // Display a welcome message
  display.setTextSize(1); // Set text size
  display.setTextColor(SSD1306_WHITE); // Set text color
  display.setCursor(0, 0); // Set cursor position
  display.println(F("Hello, DisplaySmall!"));
  display.display(); // Render the text on the screen
}

void loop() {
  // Add your main code here
}

1. Display Not Turning On:

   • Ensure the VCC and GND pins are correctly connected.
   • Verify the power supply voltage (3.3V or 5V).

2. No Output on the Screen:

   • Check the I2C connections (SCL and SDA).
   • Confirm the I2C address matches the one in your code (default is 0x3C).
   • Ensure the pull-up resistors are in place if required.

3. Flickering or Unstable Display:

   • Verify the power supply is stable and sufficient.
   • Check for loose connections on the I2C lines.

4. Library Errors:

   • Ensure the Adafruit SSD1306 library is installed and up to date.
   • Verify that the correct screen dimensions (128x64) are defined in the code.

• Use a multimeter to check the voltage levels on the VCC and GND pins.
• Test the I2C communication using an I2C scanner sketch to detect the module's address.
• Double-check all wiring and connections for errors or loose contacts.
• Refer to the library documentation for additional configuration options.

By following this documentation, you can successfully integrate and operate the DisplaySmall module in your projects.