How to Use Blue 16x2 Character Slim OLED Module: Examples, Pinouts, and Specs

The Blue 16x2 Character Slim OLED Module (Manufacturer Part ID: NHD-0216CW-AB3) by Newhaven Display is a compact and efficient display module designed for embedded systems. It features a 16x2 character layout, utilizing OLED technology to deliver high contrast, wide viewing angles, and low power consumption. This module is ideal for applications requiring clear text display in a compact form factor, such as industrial control panels, consumer electronics, and IoT devices.

• Embedded systems and microcontroller projects
• Industrial control panels
• Consumer electronics (e.g., home appliances)
• IoT devices and smart home systems
• Portable devices requiring low-power displays

Below are the key technical details and pin configuration for the NHD-0216CW-AB3 module:

The module has a 14-pin interface. The pin configuration is as follows:

1. Power Supply: Connect the VCC pin to a 3.3V power source and the GND pin to ground.
2. Interface Selection: The module supports both I²C and SPI communication. For I²C:
   • Connect the SCL pin to the microcontroller's clock line.
   • Connect the SDA pin to the microcontroller's data line.
   • Leave the CS pin unconnected.
3. Reset: Connect the RES pin to a GPIO pin on the microcontroller for resetting the display.
4. Data/Command Control: Use the DC pin to toggle between data and command modes.
5. Pull-Up Resistors: For I²C communication, ensure pull-up resistors (typically 4.7kΩ) are connected to the SCL and SDA lines.

• Voltage Levels: Ensure the module operates at 3.3V. Using 5V may damage the display.
• Initialization: Properly initialize the display using the manufacturer's recommended sequence.
• Viewing Angle: The OLED display offers a wide viewing angle, but ensure it is mounted securely for optimal readability.
• ESD Protection: Handle the module with care to avoid electrostatic discharge damage.

Below is an example of how to interface the NHD-0216CW-AB3 module with an Arduino UNO using the I²C protocol:

#include <Wire.h> // Include the Wire library for I²C communication

#define OLED_I2C_ADDRESS 0x3C // Default I²C address for the display

void setup() {
  Wire.begin(); // Initialize I²C communication
  initializeOLED(); // Call the function to initialize the display
}

void loop() {
  displayText("Hello, World!"); // Display text on the OLED
  delay(2000); // Wait for 2 seconds
  displayText("16x2 OLED Module"); // Update the text
  delay(2000); // Wait for 2 seconds
}

void initializeOLED() {
  Wire.beginTransmission(OLED_I2C_ADDRESS);
  Wire.write(0x00); // Command mode
  // Send initialization commands (refer to the datasheet for details)
  Wire.write(0xAE); // Display OFF
  Wire.write(0xA8); // Set multiplex ratio
  Wire.write(0x1F); // Multiplex ratio value
  Wire.write(0xD3); // Set display offset
  Wire.write(0x00); // Offset value
  Wire.write(0xAF); // Display ON
  Wire.endTransmission();
}

void displayText(const char* text) {
  Wire.beginTransmission(OLED_I2C_ADDRESS);
  Wire.write(0x40); // Data mode
  while (*text) {
    Wire.write(*text++); // Send each character
  }
  Wire.endTransmission();
}

• Replace the initialization commands in initializeOLED() with the exact sequence provided in the datasheet for the NHD-0216CW-AB3.
• Ensure the I²C address (0x3C) matches the module's configuration.

1. Display Not Turning On:

   • Verify the power supply voltage (3.3V) and connections.
   • Check the RES pin to ensure the module is not stuck in reset mode.

2. No Text Displayed:

   • Ensure the initialization sequence is correct.
   • Verify the I²C address and connections to the SCL and SDA pins.

3. Flickering or Unstable Display:

   • Check for loose connections or poor soldering.
   • Ensure proper pull-up resistors are used on the I²C lines.

4. Incorrect Characters Displayed:

   • Verify the data being sent to the display.
   • Ensure the microcontroller's logic levels are compatible with the module.

Q: Can this module be powered with 5V?
A: No, the module operates at 3.3V. Using 5V may damage the display.

Q: Does the module support custom characters?
A: Yes, the module supports custom characters. Refer to the datasheet for instructions on creating and displaying custom characters.

Q: Can I use this module with SPI instead of I²C?
A: Yes, the module supports SPI communication. Refer to the datasheet for the required pin connections and initialization sequence.

Q: What is the typical lifespan of the OLED display?
A: The OLED display has a typical lifespan of 50,000 hours under normal operating conditions.