8x8 led matrix code generator using arduino pin. An 8x8 LED matrix has 64 LEDs with rows & cloumns.
8x8 led matrix code generator using arduino pin Components and supplies. All, Using a maze generation algorithm, I hooked up an atari joystick (via arduino and rainbowduino) to a 8x8 RGB LED Matrix. 8x8Matrix_LED. You can drive the rows from Arduino pins, each one through a series resistor, if 20mA is enough for the LEDs. Been using the MD_parola lib for scrolling text and its working well, including custom fonts that i have made. I'm going to assume it's controlled via column and row inputs and not SPI based on the sample code you provided. LED Dot matrix driven by MAX7219 works perfect with Arduino. -C I uploaded this code with success: // Simple program to test using the Arduino with the RGB Matrix // & Backpack from Sparkfun. which means pins 1-8 are there. Sign in Product It rotates the bufferLong's by 1 bit and then displays the bits 16-23 in the first (left) LED matrix and bits 8-15 in the right LED matrix. I am just unsure what pins on arduino to go to. If you’re using another Arduino board, check the official documentation for equivalent SPI pins. The matrix module uses 3 pins of the microcontroller. Binary Code generator for character or text Personally I would avoid using pins 0 and 1 as they are used by the Serial interface. Once you've written a function the code is I have an Arduino 8x8 led attached to a shield on the Arduino. The code initializes the LED matrix, sets the brightness, and clears the display. This is a very easy project for starters like me, the idea of it is to show you how to send bytes to an 8x8 LED matrix. Arduino IDE. the problem i'm having is that only one of the shift registers are outputting at one time. Learn how to identify matrix Learn how LED matrix works, how to connect LED matrix to Arduino, and how to program Arduino step by step. Code samples. In Visuino, click on the Build tab at the bottom, make sure the correct port is selected and click on the Compile/Build Hi all, I am new at this. Components Name Quantity Purchase Hello, I recently acquired an oscilloscope as I've been having some odd issues with multiplexing simple one color LED matrices with the TLC5940 Mux library. Its a tutorial about a dot matrix module. can any 1 give me simple advice on how to approach the code. Comments. I have an array holding the binary and I dont know how to get the matrix to display that (as it wont allow the use of arrays). Attach the CLK pin of the matrix to the digital 8 pin of the Arduino. This driver uses SPI communication, requiring only three Arduino pins to control all 64 LEDs in the matrix. 69 for (byte i = 2; i <= 13; i ++) 70 pinMode Each block has an 8x8 LED matrix (64 LED) and a MAX7219 driver. I use 788bs, a common anode 8x8 led matrix Modules for this project. N. 3: 743: May 5, 2021 How to make a 8x80 LED Dot Matrix display. GND and Digital Pin 8 to the LED matrix' 5V, GND and DIN pins, connect Arduino's GND and Digital Pin 2 with a push button as shown in the image; ATtiny45. Theory An 8*8 matrix LED display which common cathode based. #CODE# /* Row-Column Scanning an 8x8 Newbie alert ! I am trying to connect a dual color LED Matrix to my Uno. Sep 27, 2019 • 56210 views • 10 respects. Testing all 64 LED of the 8x8 LED matrix. Reload to refresh your session. 69 for (byte i = 2; i <= 13; i ++) 70 pinMode hi i am trying to control an 8x8 matrix of rgb leds using 4 74hc164 shift registers. 1 // Mario's Ideas 2 // Testing all 64 leds in 8x8 LED matrix by lighting them up one by one 3 4 // Raws 5 #define R1 2 6 #define R2 3 7 #define R3 4 8 #define R4 5 9 #define R5 6 10 8×8 LED Matrix Tutorial + Project Code and Schematic. Have followed the instructions and using the code from a book. Stolen from Arduino. 1 // Mario's Ideas 2 // Testing all 64 leds in 8x8 LED matrix by lighting them up one by one 3 4 // Raws 5 #define R1 2 6 #define R2 3 7 #define R3 4 8 #define R4 5 9 #define R5 6 10 This Arduino code generates a falling rain effect on an 8x8 LED matrix using the MAX7219 LED driver. 69 for (byte i = 2; i <= 13; i ++) 70 It may be hectic to find the correct code for any custom character, hence, this project will automate and generate code for an 8x8 led matrix and will also print the custom character on Adafruit HT16k33 8x8 Bicolor Matrix. IN this video you will learn how to use 8x8 Matrix LED to display text and move it. I've recently created an LED matrix but now want to create animations for it. Pin Definitions: led_row and led_col arrays define the pins connected to the rows and columns of the LED matrix, respectively. I do not use resistors Attach the DIN pin of the matrix to the digital 10 pin of the Arduino. It can be powered by the 5V output of Hi everyone, I successfully drove one color on the matrix board. Wanted to set about making a simple rendition of this game (Speed Stacker Game: Build a Tower, Row by Row | Free Online Games | Reaction Time/Timing) using an Arduino Uno, a push button and an 8x8 LED matrix. And here is the arduino sketch: /* LEDMATTINY_DISP by Baselsw 2012. Warning : Each LED is capable of drawing as much as 60mA (at peak brightness the matrix can draw just over 3. I have attached my current edit, which includes the comments by the original author of the Tetris code (Jae Yeong Bae). Drawing captivating animations became a breeze using an online Matrix Sprite generator 8x8 LED Matrix using MAX7219 Arduino Module. Code of the Project Matrix VCC to Arduino VCC; Matrix GND to Arduino GND; Matrix Din to Arduino D11; Matrix CS to Arduino D10; Matrix CLK to Arduino D13; To control the matrix, I used the Arduino LEDControl library, enabling access to individual LED pixels, rows, and columns. //Game of Life with MAX7219 /* * dataPin pin on the Arduino where data gets shifted out * clockPin pin for the clock * csPin pin for selecting the device * numDevices maximum number of devices that can be controled LedControl(int dataPin, int Hey guys, I'm relative new to the Arduino world. . Can do with 2 shift registers; 74HC595? Brightness will be limited due to current limitations of the parts, really need a high current buffer like ULN2803, or 8 8x8 Matrix LED Arduino Project. The rows are controlled by one 74HC595 shift register in a common anode configuration (all LEDs in a row share a common positive connection), and the columns are controlled by another 74HC595 in a common cathode configuration (all LEDs in a column share a common negative connection). 3ms to complete. It may be easier if you use an array of pins so your row and column variables in the for loops can start from 0. This module can manage up to 64 LEDs in an 8x8 grid, enabling it to display characters, Interface an 8x8 LED matrix module MAX7129 LED driver with Arduino. you must connect the 8x8 led matrix inputs to the corresponding pin callouts for the rows and columns in the code provided (or hi, I'm in the process of building a controller for the sparkfun rgb led matrix. Arduino LED Matrix Kit: Arduino LED Matrix Kit was developed so that you can work with an 8x8 LED Matrix, an integrated circuit MAX7219, and an Arduino. LED Dot Matrix Display, Red. Control the snake using buttons and display the game on the LED matrix. Arduino Code & Circuit with example We will generate different rolling LED patterns as well as shape and display it on LED Matrix using different Arduino Codes. Scheme. Left side pin 1-4 controls the first 4 columns pin 5-12 controls the 8 green rows pin 12-15 controls the last 4 columns Right side pin 16-23 controls 8x8 LED Matrix . This is an arduino library for driving the 8x8 LED matrix using the 16 pins directly on the part. Code is a combination of Heather Hello All First time poster here. 12 13 rows are the anodes 14 cols are the cathodes 15----- 16 17 Pin numbers: 18 Matrix: 1 /* 2 Row-Column Scanning Hello everyone, Like many people here I am new to coding and I am stuck on trying to get my 8x8 MAX7219 to function the way I want. My Having problems moving forward with the new rgb 8x8 led matrix backpack from sparkfun I'd like to showcase a series of images on the matrix, but it's driving me mad. No external components are needed besides the matrix, push-button, potentiometer, and Arduino. Please use this code as you wish!! =D Enjoy! An 8x8 LED matrix has 8 anode lines and 8 cathode lines. The sensible way to approach this is to buy a couple (and why not?) of the rubbish MAX7219 matrix modules - as a kit. A super simple project using just 3 items! Apps and platforms. S. It employs the MAX7219 LED driver IC, which simplifies the task of connecting and controlling multiple LEDs. - sbsev3/8x8-LED-matrix sbsev3/8x8-LED-matrix. I've got this LTP-2B88AG-NB LED Matrix from the LITEON brand. com/learn/arduino/8x8LED/ In that link yo In this project, we will learn how to use the 8×8 LED Matrix MAX7219 with Arduino. I'm following a guide/textbook lesson but they don't go into details how to wire it to Arduino. Copy generated C code into your project; Use predefined sets of fonts and icons; Play animation with configurable inter-frame delay (in milliseconds) Choose matrix color; Hardware. ino. The first project will be a simple interface between Arduino and 8X8 LED Matrix to display information (even scrolling information and images can be displayed) and the second project will be an advanced project where the 8×8 LED Matrix is controlled through an The 16 pins of the matrix are hooked up to 16 pins of the Arduino board. Once programmed, I uploaded the code to the Arduino, and voila! Our LED matrix sprung to life, showcasing mesmerizing visuals. These hex values can also be generated from xantorohara's led matrix editor https The first is an WS2812 8×8 64 LED Matrix LED 5050 module. This will help to generate code for your matrix. I also have an Arduino UNO. any help is greatly appreciated. Four of the analog pins are used as digital inputs 16 through 19. ) In the following image, the Sending Bytes to an 8x8 LED Matrix. Code. h > 2 3 int DIN = 10; 4 int CS = 9; 8x8-LED-matrix-Building 8x8 matrix from scratch and printing characters on it using Arduino. An 8x8 LED matrix has 64 LEDs with rows & cloumns. Standard setup using 1-of8 decoder into 8 p-channel FETs for each row, and then having each column tied to output pins 1->8 on the TLC5940. I've reviewed some of the intro code on working with an LED matrix, but I cannot find anything that is similar as a point of reference for In this tutorial, you’ll learn how to use a 8×8 dot matrix LED module with IC MAX7219. 1. An easy config will guide you through setting up the display. After completing the circuit please upload the Arduino code which is given below. And a Max7219 Driver for controlling it. Arduino Code 8x8 WS2812 LED matrix driven by an Arduino Uno or ATtiny45 using AVR assembler code - MuellerA/Led-8x8. 8x8 matrix led. Adafruit im trying to drive an 8x8 LED matrix using 2 74HC595 Shift registers. You signed in with another tab or window. So i made a 8x8 led matrix and i want to control it with my arduino with no driver. 2- I have found Somewhat of a waste of time really! Get a MAX7219 module. Updated Jan 26, Hello I have a 8x8 LED matrix and arduino uno r3. I was wondering if anyone could give me insight on how to implement hexadecimal code into my matrrix code thanks in advance:Chris all letters in the characters array aren't completed i havent Here you need two steps before starting a matrix connection with Arduino as per the 788bs datasheet matrix pins connection given. Here's the code. I carefully placed 64 LEDs in an 8 by 8 matrix layout, ensuring proper connections for How to Control 8x8 Led Matrix using 4017 decade counter, 8 Digital Arduino outputs, and 8 resistors. At the end, you’ll be able to display any shape or text on one or more Dot matrix easily, fixed or scrolled, using only 4 digital pins of arduino. I have programmed this with all the letters of the alphabet,if you wish to add something go HERE: https://robojax. Here are the arrays and setup code, the loop code is left as an exercise. Search code, repositories, users, issues, pull requests Search Clear. The characters are displayed using the multiplexing techniques. arduino arduino-library 8x8-led-matrix 8x8-dot-display. And the 5V regulator is capable of providing a max current of 200mA. I have the rows on pins 2-9, and columns on pins 9-13 and A0-A3. I was able to to connect the matrix Chip ATtiny 2313 and I know how to light an entire line. the code im using is: digitalWrite(latch,LOW); shiftOut(data1,clock,MSBFIRST,0x80); shiftOut(data2,clock,MSBFIRST,0x80); digitalWrite(latch,HIGH); but there is only input coming Thanks for the reply. Sep 27, 2019 • 56313 views • 10 respects. The led matrix requires higher operating current. LED Coordinates: coords_1 Because the original code is meant for a 8x8 LED matrix like one of these (jolliFactory: Bi-color LED Matrix Driver Module DIY Kit), I am terribly confused with how to edit the code accordingly to work with my current setup. Two potentiometers, connected to analog pins 0 and 1, control the movement of a lit LED in the matrix. At 3:12 you can see where he I wasn't able to find a tutorial that clearly tells how to wire 8x8 matrix of LEDs. I've seen some example sketches but they all use hexadecimal code such as this 0x8f. After getting it to work I permatized it on a Hi everyone! Here is my problem: I tried to do the following assembly on my arduino Uno with the following code iint DataPin = 11; //data int LatchPin = 8; //STCP int ClockPin = 12; //SHCP int clock = 9; //CD4017 Pin14 int Reset = 10; //CD4017 Pin15 //x,y for the loop int x; int y; // here the definion of all the letter(big ans small) and numbers #define A Sending Bytes to an 8x8 LED Matrix. The heart of our LED matrix is the versatile MAX7219 display driver, capable of driving the LED matrix efficiently. For that, we are going to interface an 8×8 LED matrix module with MAX7129 LED driver with Arduino Uno Board. Save images as a C code for Arduino; Import the C code back into the editor at any time; Choose type of generated code (64-bit integers or arrays of bytes) Predefined fonts 8x8; Use browsing history and save images as a link or bookmark, so you never lost your creations; I hope you will be fun and happy using it. using arduino uno. Once assembeled, and the matrix plugged in, it gives me a 5 pin input "VCC, GND, DIN, CS and CLK" I have TWO problems: 1- Apart from the Power and Ground, I can't find the corresponding pins on the ARDUINO. I am using the code here: Arduino Playground - DirectDriveLEDMatrix. In the first diagram they're clearly marked which pins go where from LED matrix to Arduino. The display principle of the 8x8 dot-matrix: It is made up of sixty-four LEDs and each LED is placed at the cross point of a row and a column. Only logged in users can Learn how to create a simple snake game using an 8x8 LED matrix and 16 pins on an Arduino board. h> #include "LedControl. This code is for Arduino Uno. In this display, there are 8 columns and 8 rows, as you can see in the images below. I just tried to follow this idea: I managed to display scrolling letters but now I want to stop them. To keep your LED matrix from burning, add 8 10kΩ resistors to the wires connected in yellow in the image below Code. Samples below implement this animation: Matrix as a 64-bit long integer. If I orient this side to be the top, where's the pin 1? I tried orienting it multiple ways but code that was supplied doesn't work at all and only fraction of Browse for the Parola library - does just that using MAX7219 chip. An 8x8 LED matrix contains 64 LEDs (Light Emitting Diodes) which are arranged Controlling 196 LEDs using 3 pins on an arduino including PWM to create hundreds of colours (well 729). Navigation Menu Toggle navigation. But i dont know howi would code it. I'm Chris, and I'll walk you through the entire process, from designing the circuit and assembling the components to programming mesmerizing animations. Many Thanks Marco. Here is a mock-up with all the LEDs lit to show layout: I was going by this video tutorial where he uses the MAX7219 chip to drive the LEDs. Connect LED matrix pin [CS] to Arduino digital pin [10] Connect LED matrix pin [CLK] to Arduino digital pin [13] Step 2: Start Visuino and Select Arduino UNO Board Type. so far ive hooked up a 74HC595 + 330ohms for each the columns of LEDs , and 74HC595 + ULN2803A for the LED rows. dotmatrix. Arduino Nano R3. 7 6 5 4 3 2 1 0 ATtiny 2313 PIN Row 5 2 7 1 12 8 14 9 MATRIX8x8 PIN 15 In this step-by-step tutorial, we're diving into the world of electronics and microcontrollers to create a personalized 8 by 8 LED matrix that can be controlled using an Arduino board. Simple project that uses 8x8 matrix LED display to show linux CPU usage history graph in realtime. Sending Bytes to an 8x8 LED Matrix. 2. cc, ArduiNoob-friendly. Arduino Uno code plus an advanced web interface to control an 8 by8 LED matrix without using any shift registers. I have an ARDUINO UNO and purchased a kit containing a board and an 8x8 led matrix and a MAX7219. Step 3: Code Stolen from Arduino. The order of the pins is assigned in two arrays in the code. I am using a Mega2560 connected to an auxiliary board that has the 8x8 MAX2719 connected to it. The first is an WS2812 8×8 64 LED Matrix LED 5050 module. 64 Pixel RGB LED Display - Another Arduino Clone: This display is based on an 8x8 RGB LED Matrix. Hello, I currently have a circuit wired up on a breadboard, I scavenged the internet to such topic and all the examples I've seen you Max chips/micro controllers, and all the code out there does not correspond to the hardware I'm using. In this project I use 8x8 matrix to display text or no. Our journey doesn't end here. So far I've decided to use 4 74HC595 shift registers to drive the leds. For testing purposes it was connected to a standard Arduino board (Diecimila) using 4 shift registers. Display a scrolling text on a 8x8 LED display using arduino. Click here for Arduino Mega Code. I now would like to display custom STATIC fonts that i have made using this font editor MD_MAX72XX Font Editor, so all good there. This video shows you how to use MAX7219 module with 8x8 LED matrix to display text or any characters on the LED. Any input would be much Four of the analog pins are used as digital inputs 16 through 19. I know how to get it to show a static pattern, for example static const uint8_t PROGMEM 8x8 LED matrix using Max7219 with Arduino Custom Characters code generator by Manmohan Pal#LEDMatrix #LEDDotMatrix #8x8LEDmatrix, #max7219, #shiftregisterIn Control 8 x 8 (64) LEDs using two 74HC595 shift registers as fast as possible using SPI and PORT access. Using that you can daisy chain them to run more 8x8 displays and you'd not run out of digital pins on the Arduino. The problem I am having is that two colors can appear at the same time but there is a side effect It is a RGB 8x8 matrix. Here is the wiring diagram! If you need any help, let me know! The In this project we are going to design an 8x8 LED matrix display, for that we are going to interface an 8x8 LED matrix module with Arduino Uno. 5 Amps at 5 Volts), this adds up so it is suggested to use a 5V 2A power supply. I have the joystick going into pins A4 and A5 (my adc header file has this already in it and I do not need the button to function). 1- 8x8 led matrix code generator. If you like you can change and define your own pins in the program. It then generates random raindrops and updates the LED matrix accordingly. Project description. Sending Bytes to an 8x8 LED Matrix. State of the 8x8 The LED matrix module contains a driver board with a MAX7219 register that allows simple interfacing with a microcontroller while managing the status of 64 LEDs. General Guidance. So, let's roll up our Hi all. I must mention that I am also using an ultrasonic sensor(HC-SR04) to trigger the LEDs. Detailed instructions, code, wiring diagram, video tutorial, and line-by-line code explanation are provided to help you quickly get DIY Customized 8x8 LED Matrix Tutorial (MAX7219 Meets Arduino): In this step-by-step tutorial, we're diving into the world of electronics and microcontrollers to create a personalized 8 by 8 LED matrix that can be controlled using an In this simple project, we are going to learn how to Interface 8x8 LED Dot Matrix with Arduino. 1 #include < LedControl. Step 6: Generate, Compile and Upload Arduino Code. h" // need the library #define trigPin 7 #define echoPin 13. This gives you ridiculous available brightness (but totally controllable both as the maximum which is set by the single resistor and overall in steps by code) requiring no code to continuously 64 Pixel RGB LED Display - Another Arduino Clone. The code is structured into several key sections: defining pin connections, setting up the Arduino board, the main loop for the heartbeat effect, and functions to control the LED matrix. Shift register is connected to Arduino as usual by data, latch and clock pins. An 8×8 LED matrix has 64 LEDs (Light Emitting Diodes) which are arranged in the form of a matrix as 8 rows and 8x8 led matrix interfacing with arduino. 8x8 led matrix code. The project I have is a very small curved surface. I'll call the cathode lines columns and the anode lines rows. arduino. It can scan, set images, and set pixels. To keep your LED matrix from burning, add 8 10kΩ resistors to the wires connected in yellow in the image below I only got my Arduino a while ago but don't have many components at the moment to mess about with. However are pins 1-8 anode or cathode? I assume 1-8 is anode or cathode and 9-16 are anode or cathode. Demo here: JoyLite Maze - YouTube Need to work on some "you win" animations, and smoothing the transition between tiles. (Updated 19 Jan, 2019) After successfully uploading the sketch to ATtiny2313, I connected the LED Matrix and power supply as the following schematic. The isr routine needs 2. All the row pins are connected to one of the output pin of the shift register. The knob is at the bottom. Because Arduino connects to LED matrix via SPI pins: Pin 13 (SCK) and 11 (MOSI) on Arduino Uno must be used. (No shift register) I know its difficult without seeing what I have done, but the odd thing is that all the LEDs are on all the In this project I use 8x8 matrix to display text or no. You switched accounts on another tab or window. Now I want it to display some text. Right now there's code to drive 1 row at one color with 4bit pwm (2 leds stored in 1 byte) using a timer2 overflow interrupt. Im programming an Uno to count up in Binary and to display that Binary onto an 8x8 LED matrix, nearly all the code is sound, its only the display part. And this is the sample how to Hi guys! I'm a newbie. - jlbabilino/8x8Matrix. Max721 GND => Arduino digital GND; The VCC pin from the LED matrix should be connected to an external 5v power supply (5v 1A recommended), each pin of the Arduino is capable of providing a max current of 40mA. This code uses a ATtiny2313 to directly drive a 8x8 LED matrix. There are several sizes of matrix depending on the number of shift registers used. But in the matrix display, it is calculated from 0 to 7. Drawing captivating animations became a breeze using an online Matrix Sprite generator. (And yes, the TLC5940 is decoupled. Apps and platforms. We kick things off by designing the circuit schematic using Altium Designer. So static font and i can over print them to make some of the 64 leds move, 8x8 LED Matrix Using Arduino: Create your own 8x8 LED matrix (no ic driver) using arduino :) here's the link: my sample video :D Connect the led matrix pins to the pins of arduino. h" //pin 4 is connected to the DataIn // pin 3 is connected to the CLK //pin 2 is connected to LOAD #define NBR_MTX 1 //number of matrices attached is one LedControl lc=LedControl(4,3,2, NBR_MTX Four of the analog pins are used as digital inputs 16 through 19. Make a simple Matrix Led design with just a few wires! I used an Arduino Mega 2560, 5 Male To Female Jumper Wires and an 8x8 Matrix Led Square. Then you can enter and display messages using a knob and push-button to display on the matrix. You can draw different symbols, shapes, or words. It keeps rotating one bit at a time and displaying until the character width has rotated out of the lower 8 bits of the buffer and then goes back to get the next character so scroll. The bare LED matrix has 16 pin outs with 8 common positive and another 8 common negative. Arduino LED Matrix Code – Scrolling Text. If the pins are set to input 68 // the display will be very dim. // Arduino 8x8 LED Matrix Code #include "LedControlMS. //Pin connected to ST_CP of 74HC595 const int clockPin = 12;//Pin connected to SH_CP of 74HC595 problem understanding a code that controls an led matrix This sketch allows you to wire up an 8x8 LED matrix without knowing which pins are for what. Last week I got an 8x8 matrix through the post however, and have been playing with that. Here is my code: #include <Ultrasonic. 8×8 LED Matrix Tutorial + Project Code and Schematic. Programming 8x8 LED Matrix. I'm trying to display static letters on my 8x8 led matrix. I'm about half done with a project of making a 8x8 LED matrix and controlling it with a MAX7219 IC. Skip to content. The anode pins connect to the columns, and 6 ***** These pin numbers will probably not work with your hardware ***** 7 pin 12 is connected to the DataIn 8 pin 11 is connected to LOAD(CS) 9 pin 10 is connected to the CLK 10 We have only a single MAX72XX. The program utilizes the LedControl library to control the LED matrix. diy. As the thread title suggests i want What is an LED matrix display? An LED matrix consists of rows and columns. At the back, there are 32 pins. Just draw anything for the matrix, copy the code, and use it in your program. You signed out in another tab or window. Design your own face/design using matrix generator or manual(1- means on, 0-means off) The MAX7219 8x8 LED matrix module is a compact, versatile display unit favoured by electronics hobbyists and developers working on microcontroller projects. After making some scrolling tex In this project, we will learn about LED Matrix Displays and two different projects on Arduino 8×8 LED Matrix Interface. For most uses, you’ll see about 1-2A of current per panel. Might also keep an internal counter for how many moves it took to solve the maze. As you can see in the diagram every column pin is connected to Arduino pin through a 220Ω resistor. I'll also attach the schematic. Below is the code I have to simply display a letter, but thats all I can figure out at this point. For wiring the top side of 8x8 LED matrix, pins from 9-16; right to left, I´m Hi All! I have an 8x8 LED Matrix but I have no idea how to construct code to make it scroll. pinMode(13, OUTPUT); pinMode(15, OUTPUT); pinMode(16, OUTPUT); Did pin 14 go missing ? The random selection includes 14 The built in LED on pin 13 may affect the output to another LED connected to it I missed pin 14 (A0) when soldering. Bill of Materials. Any help or guidance would be appreciated! const int rClock = 2; //chip pin 7 const int rData = 0; //chip pin 5 const int cData = 4; //chip pin 3 const int latch = 1 The 8x8 LED matrix consists of 64 LEDs arranged in rows and columns. The matrix is a YSM-1288CR3G2C2 the circuit uses 8 one K resistors, and 12 Uno pins, only using Red. The possibilities are limitless. Join the CS pin of the matrix to the digital 9 pin of the Arduino. 8x8 Dot Matrix max7219. nfjazzojgrcxztcojkguhvuomsvpuigyblrafltbfkujsvxcftjgmcbdjupitzlwyvakkoqgmczmmupesp