Arduino Uno R4 LED Matrix - Jude and ArduinoPrints3D | Nexprint: Free 3D Model Downloads

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Arduino Uno R4 LED Matrix

Jude and ArduinoPrints3D

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Released 2025-10-09

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Introduction

This is the Arduino Uno R4 LED Display. A versitile multi use display built around the Arduino Uno R4 and the FC16 MAX7219 Matrix display.

Parts needed	Quantity
Arduino Uno R4	1
FC16 MAX7219 LED Matrix	1
Jumper wires	5
M3 - x 16mm machine screws	6
M3 - 0.5 hex nut	6

Assembly

https://youtu.be/aHY0XCIAKvU

1	Print all parts
2	Slot a nut into each of the slots on the front of the 3D printed base.
3	Slide the Arduino into the lower slot on the base.
4	Add wires to each of the five pins on the FC16.
5	Connect the wires to the Uno as indicated below

FC16	Arduino Uno R4
VCC	5V
GND	GND
DIN	D11
CS	D8
CLK	D13

6	Screw the FC16 onto the diffuser with the bracket, foru screws, and four nuts.
7	Slide the FC16/diffuser part into the upper slot on the base.
8	Screw the lid on with two more screws to secure everything inside.
9	Upload example code to test it or make it your own.
10	Enjoy!

Example code

#include <MD_Parola.h>
#include <MD_MAX72xx.h>
#include <SPI.h>


#define HARDWARE_TYPE MD_MAX72XX::FC16_HW
#define MAX_DEVICES 4
#define CS_PIN 8


byte counter = 0;
char counterChar[4] = {0};
MD_Parola P = MD_Parola(HARDWARE_TYPE, CS_PIN, MAX_DEVICES);


void setup(void)
{
  P.begin();
  P.print("Hello!");
  delay(4000);
  P.displayText("I am the Arduino Uno R4 LED Matrix", PA_CENTER, 50, 0, PA_SCROLL_LEFT, PA_SCROLL_LEFT);
}


void loop(void)
{
  if(P.displayAnimate()){
    counter++;
    sprintf(counterChar, "%d", counter);
    P.displayText(counterChar, PA_CENTER, 20, 0, PA_SCROLL_LEFT, PA_SCROLL_LEFT);
    }
}

Notes.

Feel free to modify files however you like and make this project your own! You could make it track anything you want! maybe it would track the weather or tell you how your computer is running. This can be made into a lot of useful projects :)