LED Matrix With Arduino Made Easy

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Introduction: LED Matrix With Arduino Made Easy

About: I love Arduino and Raspberry pi and High Voltage... i build robots and also other cool stuff so stay tuned !!

I am gonna teach you how to use a MAX7219 Led Matrix with arduino UNO and the best part is that it is super easy.

Step 1: What You Need ?

The parts list:

1. MAX7219 LED Matrix

2. M/F Jumper Wires

3. Arduino UNO

4. USB cable for arduino

5. Computer

Step 2: Wiring

There are 5 pins on the module that are connected in a way :

Vcc to 5v

Gnd to Gnd

DIN (DataIN) to Digital Pin 11

CS (LOAD) to Digital Pin 10

CLK to Digital Pin 13

Step 3: Programming !!

MAX7219.ino is a sketch of scrolling text. You can change the text that is scrolling on the matrix by changing the line in the sketch shown in the picture and writing what you want. This the link for the MaxMatrix library https://github.com/riyas-org/max7219. From it put the folder named MaxMatrix in you arduino libraries folder which is located in the documents folder

Step 4: Testing Results

It is totally wicked !! It doesn't look half as good in the pictures as it really is. In the pictures it looks like that the leds are bright but they are diffused leds and you can see it only when you build it. So what are you waiting for !!

Step 5: Thinking Ahead

You can wire 8 matrices together and use them with arduino still only using 3 pins. The CS, CLK, 5v and Gnd of all matrices are wired together and the DataOut of the first matrix is wired to the DataIn of the next matrix and so on. The center header pin opposite to header pins near the ic is the DataOut.

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    user

    We have a be nice policy.
    Please be positive and constructive.

    Tips

    3 Questions

    Maybe a little off topic but....

    Would I be able to drill a hole(s) in the middle of the LED matrix, missing LED's and solder points, and it still be functional?

    Hi there. I get an error message that says

    Invalid library found in C:\Users\Administrator\Dropbox\Arduino\libraries\max7219-master:

    I've installed the MaxMatrix and max7219-master libraries.

    Any ideas on how I can fix this?

    I'm getting an error in line 11 when compiling the code. Can you help?

    FSJCEIJI4J6TSTH:11: error: 'prog_uchar' does not name a type
    PROGMEM prog_uchar CH[] = {
    ^
    C:\Users\Robert\SkyDrive\Documents\Arduino\LED Matrix Test\FSJCEIJI4J6TSTH\FSJCEIJI4J6TSTH.ino: In function 'void printCharWithShift(char, int)':
    FSJCEIJI4J6TSTH:164: error: 'CH' was not declared in this scope
    memcpy_P(buffer, CH + 7*c, 7);
    ^
    C:\Users\Robert\SkyDrive\Documents\Arduino\LED Matrix Test\FSJCEIJI4J6TSTH\FSJCEIJI4J6TSTH.ino: In function 'void printString(char*)':
    FSJCEIJI4J6TSTH:189: error: 'CH' was not declared in this scope
    memcpy_P(buffer, CH + 7*c, 7);
    ^

    0

    change prog_uchar to const unsigned char

    23 Comments

    Question :

    Is it possible to change the pin assignments for the CLK, & DIN pins if so, where/how do you do it ?

    how pin nummbers in mega 2560 - clk , data in???

    1 reply

    Hi I have some problem see as below and need to help

    MAX7219.ino:8:23: fatal error: MaxMatrix.h: No such file or directory

    compilation terminated.

    Error compiling.

    Thank...

    3 replies

    Where exactly do you download the library.

    Just search for MAX7219 arduino library and select the Github page and download it from there and put the downloaded folder in the library folder of arduino which is located in the documents folder. This the link for the library https://github.com/riyas-org/max7219 . From use the maxmatrix folder

    user

    I would like to see this done with an RGB matrix

    1 reply

    It can be done but I don't have an rgb led matrix.

    How do I work the led matrix when it has 8 pins and I don't know which pin is which?

    I included pictures of what mine looks like, and it doesn't include the thing you have on yours with the five pins on it.

    hi.jpgindex.jpgledmatrix.jpg
    4 replies

    You need the MAX7219 IC.

    mine also has 16 pins but is multiplexed by max7219 IC in the module so it can controlled with 5 pins. Buy this module on amazon or some other site

    Is there any way to do this without the module? (I'm kinda broke right now... lol) It's okay if you don't know, I'm just asking.

    mine also has 16 pins but is multiplexed by max7219 IC in the module so it can controlled with 5 pins. Buy this module on amazon or some other site

    i downlode laibrary but not compail program

    I'm receiving error: 'prog_uchar' does not have a name

    hi, my son is trying to put this together with text saying "HELLO!" what changes he has to do in coding that we downloaded to be able to make this work? Thank you

    1 reply

    Search for char string1[] and type what you want in the inverted commas

    Hi friend! First, thanks for the tutorial;
    How do I reverse the characters 90 degrees right?
    In my Display is rolling vertically!
    thanks
    1 reply

    You can physically turn the entire thing by 90 degrees and it is now scrolling horizontally...unless I misunderstood the question.