How to Use Estardyn 1.3 Inch OLED Display with EC11 Rotary Encoder Module: Examples, Pinouts, and Specs

The Estardyn 1.3 Inch OLED Display with EC11 Rotary Encoder Module is a versatile electronic component that combines a high-resolution 1.3-inch OLED display with an EC11 rotary encoder. The OLED display provides crisp and clear visuals, making it ideal for creating user interfaces, displaying data, or visualizing sensor outputs. The EC11 rotary encoder adds functionality for user input, enabling precise control, menu navigation, or parameter adjustments.

This module is widely used in applications such as:

• DIY electronics projects
• Embedded systems with graphical interfaces
• Control panels for industrial or home automation
• Audio equipment for menu navigation and volume control
• Prototyping interactive devices

To use the Estardyn 1.3 Inch OLED Display with EC11 Rotary Encoder Module, follow these steps:

1. Wiring the OLED Display:

   • Connect the VCC pin of the OLED to the 5V pin on the Arduino.
   • Connect the GND pin of the OLED to the GND pin on the Arduino.
   • Connect the SCL pin of the OLED to the A5 pin (I2C clock) on the Arduino.
   • Connect the SDA pin of the OLED to the A4 pin (I2C data) on the Arduino.

2. Wiring the EC11 Rotary Encoder:

   • Connect the VCC pin of the encoder to the 5V pin on the Arduino.
   • Connect the GND pin of the encoder to the GND pin on the Arduino.
   • Connect the CLK pin of the encoder to digital pin 2 on the Arduino.
   • Connect the DT pin of the encoder to digital pin 3 on the Arduino.
   • Connect the SW pin of the encoder to digital pin 4 on the Arduino.

Below is an example Arduino sketch to display text on the OLED and read input from the rotary encoder:

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

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

// Initialize the OLED display
Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, -1);

// Rotary encoder pins
#define CLK 2
#define DT 3
#define SW 4

int counter = 0; // Counter for rotary encoder
int lastStateCLK;
int currentStateCLK;

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

  // Initialize OLED display
  if (!display.begin(SSD1306_I2C_ADDRESS, 0x3C)) {
    Serial.println(F("SSD1306 allocation failed"));
    for (;;);
  }
  display.clearDisplay();
  display.setTextSize(1);
  display.setTextColor(SSD1306_WHITE);
  display.setCursor(0, 0);
  display.println("Rotary Encoder Demo");
  display.display();

  // Set up rotary encoder pins
  pinMode(CLK, INPUT);
  pinMode(DT, INPUT);
  pinMode(SW, INPUT_PULLUP);

  // Read the initial state of the CLK pin
  lastStateCLK = digitalRead(CLK);
}

void loop() {
  // Read the current state of the CLK pin
  currentStateCLK = digitalRead(CLK);

  // If the state has changed, determine the direction
  if (currentStateCLK != lastStateCLK) {
    if (digitalRead(DT) != currentStateCLK) {
      counter++;
    } else {
      counter--;
    }

    // Display the counter value on the OLED
    display.clearDisplay();
    display.setCursor(0, 0);
    display.println("Rotary Encoder Demo");
    display.setCursor(0, 20);
    display.print("Counter: ");
    display.println(counter);
    display.display();
  }

  // Update the last state of the CLK pin
  lastStateCLK = currentStateCLK;

  // Check if the push button is pressed
  if (digitalRead(SW) == LOW) {
    display.clearDisplay();
    display.setCursor(0, 0);
    display.println("Button Pressed!");
    display.display();
    delay(500); // Debounce delay
  }
}

• Use pull-up resistors for the rotary encoder pins if necessary to ensure stable readings.
• Avoid excessive current draw from the Arduino by powering the module through an external power source if needed.
• Use a level shifter if interfacing the module with a 3.3V microcontroller.

1. OLED Display Not Turning On:

   • Ensure the power and ground connections are secure.
   • Verify the I2C address (default is 0x3C) and update the code if necessary.
   • Check for loose or incorrect wiring.

2. Rotary Encoder Not Responding:

   • Confirm the CLK and DT pins are connected to the correct Arduino pins.
   • Check for debounce issues and add software debouncing if needed.

3. Push Button Not Working:

   • Ensure the SW pin is connected to the correct Arduino pin.
   • Verify the button is not stuck or damaged.

Q: Can I use this module with a 3.3V microcontroller?
A: Yes, the module supports both 3.3V and 5V logic levels.

Q: What is the maximum refresh rate of the OLED display?
A: The refresh rate depends on the I2C communication speed, typically up to 400kHz.

Q: Can I use SPI instead of I2C for the OLED?
A: No, this module is designed specifically for I2C communication.

Q: How do I change the I2C address of the OLED?
A: The I2C address is fixed at 0x3C and cannot be changed on this module.

By following this documentation, you can effectively integrate the Estardyn 1.3 Inch OLED Display with EC11 Rotary Encoder Module into your projects!