LED dot matrix can be used in simple display applications where the resolution is not a big concern. Available in different sizes and colors. Robust usability. It has long life almost 50,000 hours if properly installed. It is called solid state lighting because it is made of solid state material with no tube no filament of bulb to break.

The order of the pins is assigned in two arrays in the code. Two potentiometers, connected to analog pins 0 and 1, control the movement of a lit LED in the matrix. To keep your LED matrix from burning, add 8 10kΩ resistors to the wires connected in yellow in the image below.

LED matrix modules are one of the commonly used display devices and are used in major applications like electronic display panels and notification systems. The project is based on the Arduino Uno microcontroller board. Out of the 14 available digital input / output pins on the Arduino Uno, we need only three pins to implement this project.

Any individual LED or a group of LEDs in the matrix can be activated by switching the required number of rows and columns. For example, in the above figure if Row1 is made high and Column1 is made low, the top left LED (address R1C1) will glow. How LED Matrix Works ? As a demonstration, lets see how we can display letter “A” using the display.