Arduino Tutorials

MAX7219 LED | Arduino Text Scrolling Display | Dot Matrix 4-in-1

How to use Dot Matrix LED Module with Arduino

In this video, we are going to see how to use “Dot Matrix LED Module” and test it with the example of “Scrolling Text”.

Hardware Required :

  • Arduino
  • HC-SR501 PIR
  • 5V 1 Way Relay
  • Buzzer
  • Lamp
  • Breadboard
  • Jumper Wires

Project circuit :

Project circuit diagram is shown below.

MAX7219 LED | Arduino Text Scrolling Display | Dot Matrix 4-in-1

An LED matrix may be a combination of 64 LEDs connected together as shown within the following circuit. As Arduino doesn’t have 64 pins, we will not connect individual pins to regulate each LED. Instead, we’ll use the concept of multiplexing :

MAX7219 LED | Arduino Text Scrolling Display | Dot Matrix 4-in-1

With the use of multiplexing, we can control any number of LEDs with Arduino. For controlling an 8 x 8 LED matrix, we need one multiplexer circuit. We can use the backpack from adafruit for the multiplexer, or a MAX7219 Dot Matrix MCU Control for the multiplexer part :

MAX7219 LED | Arduino Text Scrolling Display | Dot Matrix 4-in-1

So, now we do not need to use a lot of pins to control this LED matrix. Instead, we require only four pins to control this LED matrix.

MAX7219 LED | Arduino Text Scrolling Display | Dot Matrix 4-in-1

Link to the Code :

https://github.com/MORYTECH/ARDUINO-CODE/blob/master/Arduino-Text-Scrolling-Display-MAX7219-Dot-Matrix%204-in-1.txt

Demonstration :

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