Questions tagged [led-matrix]
The led-matrix tag has no summary.
20 questions
0 votes
2 answers
137 views
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
0 votes
1 answer
389 views
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
0 votes
1 answer
136 views
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 answer
98 views
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 answers
308 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 ...
- 149
0 votes
1 answer
118 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 ...
- 105
0 votes
2 answers
517 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()...
- 105
2 votes
1 answer
197 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 ...
- 21
0 votes
1 answer
1k 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 ...
- 161
3 votes
2 answers
340 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 ...
- 161
2 votes
1 answer
104 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 ...
- 116
2 votes
2 answers
201 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 ...
- 23
1 vote
1 answer
357 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, ...
1 vote
0 answers
133 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.
- 11
2 votes
2 answers
1k 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. ...
- 21