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Questions tagged [led-matrix]

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Why 0 devices, but not 1?

I have found a sketch in Wokwi where a MAX7219 LED matrix is used. The sketch subject is to display 0 using <LedControl.h>. I don't understand why it's nessesary to send 0 unlike 1 in fourth ...
Artur Krush's user avatar
1 vote
2 answers
201 views

Why doesn't this code for an 8x8 LED matrix work properly?

There's an Arduino Uno (Keyestudio KS0078) and a 788BS 8x8 LED matrix. I built the circuit as on the image and ran this program: #define MY_PERIOD 200 int displayColumn = 0; uint32_t tmr1; unsigned ...
Mik's user avatar
  • 149
0 votes
1 answer
90 views

Problem with character concatenation algorithm in matrix led

good afternoon, I am making a 7x10 led matrix in which I use a CD4017 to handle the 7 rows and 2 cascaded shift registers to handle the 10 columns. I first tried a programming to turn on my entire led ...
Lucio Mazzini's user avatar
0 votes
2 answers
262 views

Shiftout only handles one shift register at a time

I am making a 7x10 led matrix and I am having problems with the shiftout function. It is only able to show me the output in one shiftout register at a time. How can I fix it? For example: void setup()...
Lucio Mazzini's user avatar
2 votes
1 answer
112 views

One LED in 4x4 matrix does not turn on [closed]

I'm an art student and absolute beginner to electronics/code - my broader goal is to learn how to control individual LEDs when there are many of them (like 64 or more even, so am learning about ...
Miso's user avatar
  • 21
0 votes
1 answer
700 views

Are resistors necessary for 8x8 LED matrix?

I was following the official tutorial of LED matrix integration and couldn't figure out why there is no resistor. I assumed there are built-in resistors in the LED matrix, so I did an experiment by ...
Weihang Jian's user avatar
3 votes
2 answers
275 views

Why does the official tutorial for LED matrix scanning writes column pin twice?

I was following the official tutorial and confused by the source code. Arduino Official built-in example: RowColumnScanning // when the row is HIGH and the col is LOW, // the LED where they meet turns ...
Weihang Jian's user avatar
2 votes
1 answer
94 views

How do I recreate the Pong game with two pots and the map function?

I am working on a project for my brothers and anyone else who is interested in playing some LED Pong. I was just stuck on the software part. I don't really know what to do. But, I have an idea: I want ...
Austin's user avatar
  • 116
2 votes
2 answers
153 views

Stuck In While Loop

So I'm a beginner at Arduino and I have to light up an LED grid to show digits from 0-9. I wrote a bit of code (with the help of some people) and it's like 90% done but there's this ONE problem. I ...
BertjeDP2000's user avatar
1 vote
1 answer
283 views

how to display text to 8x8 matrix with 64-bit long integers?

I have an array of 64-bit integers to display on an 8x8 led matrix const int LEN1 = sizeof(Hours); const uint64_t Hours[] = { 0x00043c3c3c3c3c00, 0x000c3c3c3c3c3c00, 0x001c3c3c3c3c3c00, ...
gio xanchkava's user avatar
1 vote
0 answers
89 views

Using a leds driver ic with arduino

I have an ic (CT1642 1442) it's a led driver 8 bit, i want to use it with my arduino nano and i don't have any idea how to use it. If someone can help me ill be thankfull.
Abdelhak11's user avatar
2 votes
2 answers
677 views

DS3231 Clock project shows right date but wrong day

Heeya Guys! Today I created a project with the help of instructables site. I followed the on screen steps and everything. Uploaded the sketch and it works like a charm, but there's one problem. ...
Shaun_Miller's user avatar
1 vote
0 answers
160 views

it just gets too hot . any way of cooling it?

there i just got started with the arduino mega2560 . i tried 8x8 matrix tube and after ~30secs i found the atmega2560 a bit hot that i can melt a small amount wax on it ! is there any sort of heatsink ...
Raj's user avatar
  • 41
1 vote
0 answers
72 views

How to get a stable LED lighting without scintillation over I2C bus

I built an 8x8 led matrix using white 5mm LEDs. I drive the LEDs using the MCP23017 connected to an Arduino over the I2C bus. The wiring of the LEDs in the matrix is such that a row is made up of 8 ...
S.E.K.'s user avatar
  • 53
0 votes
1 answer
502 views

Is my 8x8 led matrix module broken?

I have an Arduino Mega set up with an 8x8 led matrix as laid out in this circuito.io project: https://www.circuito.io/static/reply/index.html?solutionId=6013e67aeaa9ed0030f668fb&solutionPath=...
Dan Forever's user avatar
2 votes
0 answers
61 views

Possible impedance problem when moving to new power supply

I'm working on building an LED matrix and I'm using an LED strip to create it. I've worked through a simple wiring setup using my bench top power supply and got a strip test working. Now that I have ...
Chris Schmitz's user avatar
0 votes
1 answer
387 views

Row-column scanning to control an 8x8 LED matrix

https://www.arduino.cc/en/Tutorial/RowColumnScanning This code really confused me because I don't know if the pixels[x][y] is HIGH or LOW in void refreshScreen(). As you look at the code, pixels[x][y] ...
Peter's user avatar
  • 11