# Questions tagged [led-matrix]

The tag has no usage guidance.

12 questions
Filter by
Sorted by
Tagged with
84 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
160 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
1 vote
88 views

### Need help figuring out how to adapt a code for a Snake Game I'm trying to make. Help greatly appreciated!

first of all thanks for clicking on this post :D For the last couple of days I've been trying to test out a game for the classic nokia snake game I've found online, but I can't seem to get it to work. ...
• 11
81 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 ...
• 101
91 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 ...
1 vote
116 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
66 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.
238 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. ...
1 vote
70 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 ...
• 41
1 vote
65 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 ...
• 53
1 vote