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Questions tagged [led-matrix]

20 questions
3
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2 answers

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 on: digitalWrite(col[thisCol], thisPixel); //…
Weihang Jian
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1 answer

One LED in 4x4 matrix does not turn on

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 shift registers, multiplexing etc. also). I have been…
Miso
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1 answer

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 to use the map() function to make my life…
Austin
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2 answers

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 used a switch case to light up the LEDs (so if the…
BertjeDP2000
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2 answers

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. Everything works correctly but not the "Day", i.e as of…
Shaun_Miller
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0 answers

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 the actual fabrication done I want to move the…
Chris Schmitz
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1 answer

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 . I don't understand why it's nessesary to send 0 unlike 1 in fourth parameter in library-object initialization. LedControl(int…
Artur Krush
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2 answers

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 char Text[] = { 0x00, 0x1c, 0x22, 0x22, 0x22,…
Mik
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1 answer

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, 0x0000001818000000, 0x0000001818100000, …
gio xanchkava
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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.
Abdelhak11
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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 or a better way to use the matrix tube ? what i…
Raj
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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 LEDs whose cathodes are wired together, and a…
S.E.K.
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2 answers

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 in the cpp source code or .h files on my PC at…
Franck
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1 answer

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 didnt understand. I am using classical DMD library…
mehmet
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1 answer

Arduino Nano spontaneously stops working and disconnects from computer

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 game (which of the blocks are still present) is…
SNBS
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