Scrolling text LED displays have become increasingly popular for conveying messages in various settings. Whether it's displaying information in public places, creating eye-catching signage, or adding a personal touch to your projects, these displays offer endless possibilities. One of the key tools for bringing these displays to life is the Arduino Uno, a versatile microcontroller board widely used in DIY electronics projects. In this blog post, we will guide you through the process of building your own scrolling text LED display using Arduino Uno.

Required Hardware Components:

  1. Arduino Uno board: The heart of your project, the Arduino Uno provides the necessary processing power and IO capabilities.
  2. Breadboard: This platform allows you to easily connect and prototype your circuit without the need for soldering.
  3. Jumper wires: These wires are essential for making connections between components on the breadboard.
  4. LED matrix display: Choose an LED matrix display of your preferred size, such as 8x8 or 16x16. This will determine the number of LEDs available for your scrolling text display.
  5. 74HC595 shift register: The shift register expands the number of output pins available on the Arduino Uno, allowing you to control multiple LEDs with fewer pins.
  6. Resistors: Depending on the LED matrix display and power supply, you may need resistors to ensure proper voltage and current distribution.
  7. Power supply: Select a suitable power supply based on the voltage requirements of your LED matrix display. Ensure it can deliver enough current to power the display.
  8. USB cable for Arduino Uno: This cable is used to connect the Arduino Uno to your computer for programming and power.

Setting Up the Arduino Uno:

To get started, follow these steps to set up your Arduino Uno:

  1. Connect the Arduino Uno board to your computer using the USB cable.
  2. Install the Arduino IDE software and the necessary drivers for the Arduino Uno.
  3. Open the Arduino IDE and select the correct board (Arduino Uno) from the "Tools" menu.
  4. Choose the appropriate port for communication between the Arduino Uno and your computer.
  5. Test the connection by uploading a simple program, such as the Blink example, to make an LED connected to the Arduino Uno blink. This ensures that the board is functioning correctly.

Coding the Scrolling Text Functionality:

Now, let's dive into the coding part. Follow these steps to implement scrolling text functionality:

  1. Start by including the necessary libraries for controlling the LED display. Depending on the LED matrix display you're using, you may need to install specific libraries. Refer to the documentation or resources provided with your LED matrix display.
  2. Initialize the variables for the data pins, latch pin, and clock pin. These pins will be used to control the shift register and send data to the LED matrix display.
  3. Create an array or string variable to store the desired text message that you want to display. For example, you can use a character array or a string variable like "Hello, Arduino!"
  4. Implement a loop to shift the text data across the LED matrix. This involves sending the appropriate data to the shift register and updating the display accordingly. Iterate through each character in the text message and shift it across the LED matrix display.
  5. Set the appropriate delay between each shift to control the scrolling speed. Experiment with different delay values to achieve the desired scrolling effect.
  6. Test the code by uploading it to the Arduino Uno and observe the scrolling text effect on your LED matrix display. Make adjustments as needed to achieve the desired scrolling behavior.

Assembling the LED Display:

Once you have the code running successfully, it's time to assemble the LED display:

  1. Refer to the datasheet or documentation of your LED matrix display to understand the pin configurations.
  2. Connect the LED matrix display to the Arduino Uno using the breadboard and jumper wires. Ensure that the data pins, latch pin, and clock pin are correctly connected according to your code and LED matrix display specifications.
  3. Connect the power supply to the Arduino Uno, adhering to the voltage requirements of your LED matrix display. Be mindful of polarity and ensure a stable power source.
  4. Double-check all the wiring connections before powering on the setup to avoid any potential issues.

Testing and Troubleshooting:

After assembling the LED display, follow these steps to test and troubleshoot any issues:

  1. Upload the complete code to the Arduino Uno and check for any compilation errors in the Arduino IDE.
  2. Power on the setup and observe the scrolling text display on your LED matrix. Verify that the text scrolls smoothly and displays the correct message.
  3. If the display is not working as expected, first check your wiring connections. Make sure all the pins are correctly connected and the power supply is providing the required voltage.
  4. Check for loose connections, damaged components, or incorrect pin assignments. Recheck the code to ensure it matches your hardware setup.
  5. Troubleshoot step by step, referring to online resources, forums, or documentation for your specific LED matrix display model.


This project showcases the power and versatility of Arduino Uno for creating interactive and dynamic displays. The combination of hardware components, coding techniques, and assembly skills allows you to personalize your scrolling text display for various applications. As you delve further into the world of Arduino Uno, you'll discover numerous other exciting projects and possibilities. So, keep exploring and let your creativity shine with Arduino Uno!