Questions tagged [led-matrix]
The led-matrix tag has no summary.
20 questions
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2
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LED Matrix for Arduino R4 Wi-Fi specific functions
I'm searching for the path and the source code for the builtin (I think) function, name is: renderBitmap().
This function appears as a member of the ArduinoLEDMatrix class but its name doesn't appear ...
- 25
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1
answer
391
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P10 LED Display Character Overlaying with DMD library
Hi, I am using p10 Led display and trying to make digital clock. it works fine but after 2 or more weeks later without any switch off there is a overlaying start on characters. why this happening I ...
- 297
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1
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137
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Arduino Nano spontaneously stops working and disconnects from computer [closed]
I'm trying to implement an Arkanoid game on a 16x16 RGB matrix (the library is Adafruit_NeoMatrix). The blocks are 2x2 squares, and there are 3 rows with 8 blocks in each. The current state of the ...
- 143
1
vote
1
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98
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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 ...
- 23
1
vote
2
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310
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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 ...
- 149
0
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1
answer
118
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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 ...
- 105
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2
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518
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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()...
- 105
2
votes
1
answer
197
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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 ...
- 21
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1
answer
1k
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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 ...
- 161
3
votes
2
answers
340
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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 ...
- 161
2
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1
answer
104
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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 ...
- 116
2
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2
answers
201
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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 ...
- 23
1
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1
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357
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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,
...
1
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0
answers
133
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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.
- 11
2
votes
2
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1k
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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.
...
- 21
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271
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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 ...
- 41
1
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0
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93
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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 ...
- 53
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1
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1k
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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=...
- 129
2
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0
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74
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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 ...
- 357
0
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1
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420
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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] ...
- 11