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Led Matrix display interface with Arduino uno

Led matrix display Pins description

There are several types of dot matrix available in the market. We can differentiate it as per size and types of connection, e.g. 5x7, 8x8, common anode, and common cathode type. It comes in different single colors and RGB.

But in this article, I will discuss 788bs as a common anode red color 8x8 Led matrix display Modules. We use it in many electronics displaying items, e.g. electronics clocks. also for moving message displays, displaying games, etc.

We use a dot matrix display with an Arduino UNO board directly, sometimes in projects. But for some projects, we use a max7219 chip or 74hc595 for dot matrix driver as required in our projects.

Led Matrix display

led Matrix 8x8 Pinout function detail

The led matrix modules are used in various colors, but I specifically describe the red led matrix. It is very easy to interface a led matrix with an Arduino board as compared to an RGB led display.

If we look at a piece of the 8x8 dot matrix, it contains 16 pins in which 8 pins are used for rows and 8 for columns. That's mean in rows and columns have 64 LEDs. We start from Pin # 1 to pin # 8. Pin number 1 is R5 (Row-5) and Pin number 8 is R3(Row-3) to the downside.
At the upper side From Pin 9 (Row-1) to Pin 16 (column-1) is located. But a newbie always confuses and starts from zero, because we know the picture/diagram. often we get from some source, also we have to sort out which one +VE and -VE. might be an expert can understand from common cathode/anode type.
But my concern about the person has a basic knowledge of electronics. Who try to make their own initial display projects like a clock or some more.

Ok let’s start if we have a 8x8 dot matrix, And how do we know where pin 1 is? As in IC Chips near Pin 1, I mentioned a dot at IC/Microcontroller Chip. But here, how do we know?

Led Matrix display

At the led matrix module, the manufacturer writes the tag or mark at pin 1 side, as shown in the figure. We definitely find it. And also a curve mentioned at pin number 1 side.

Led Matrix display

Row =       +  Positive Supply
Column =  - Negative Supply
We required a testing power supply of 1.5V DC. For the matrix, usually, a 5v supply is used. But, here the only one battery cell is enough or uses one 130 ohm resistance in series at a positive/negative side with 5v supply.

Led Matrix display

After that attached led to the power supply. We found that the 8th column and 5th rows led to becoming ON as Connection shown in the figure. How to connect the battery cell with a matrix display.

Led Matrix display

Pin Test of led dot matrix

As shown in fig pin # 1 and pin # 16 got Energize and the 8th Column and 5th-row led become ON. We should verify the Dot-matrix before using it because if any led is found blown we can replace it with a good one.

Led Matrix display

Programming with Arduino UNO


To run the 788bs, you need to check it with Arduino UNO. What material do you need to perform a complete test?

Arduino UNO        Amazon

Breadboard         Amazon / Banggood

788BS 8x8 matrix    Amazon / Banggood
Battery (1.5V) only one
Jumper wires

We often use the dot matrix display with the shift register 74HC595 led driver or max7219. most common in electronic Circuits, we operate it with a Microcontroller or Arduino platform, and even with Raspberry Pi. To run led matrices with Arduino, we need to add a matrix library in the Arduino library. But in this circuit, we will test the matrix direct with an Arduino UNO board.

Interface dot matrix with Arduino

First set the matrix circuit, as per the connection given in the picture diagram. start the Arduino IDE to program the Arduino UNO board. Arduino IDE is available at Arduino's official site.
This circuit, it does not need resistance at all. Just connect wires as per the instruction.
Here you need two steps before starting a matrix connection with Arduino as per the 788bs datasheet matrix pins connection given.

1- 8x8 led matrix code generator

This will help to generate code for your matrix. Just draw anything for the matrix, copy the code, and use it in your program. You can draw different symbols, shapes, or words.

2- Add matrix library with Arduino Ide

​​​​​​​First, add the 8x8 led dot matrix library in Arduino Ide. hereafter, the library manager in Arduino Ide will run the code. It will display in the matrix.

The connection between Led matrix display and Arduino UNO

Matrix Rows Pins #  ------------ Arduino Uno output Pins #
                   Pin #  1  ---------- 2 
                              2  ---------- 3 
                              3  ---------- 4 
                              4  ---------- 5 
                              5  ---------- 6 
                              6  ---------- 7 
                              7  ---------- 8 
                              8  ---------- 9 

Matrix Column: Pins #  ----------------- Arduino Uno output Pins #
                       Pin # 1  ------------ 10 
                                 2  ------------  11
                                  3  ------------ 12
                                   4  ------------  13
                                   5  ------------  A1
                                   6  ------------ A2
                                   7  ------------  A3
                                   8  ------------ A4
 

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