Questions tagged [led-matrix]
Anything related to LED matrices. A LED matrix is a rectangular arrangement of LEDs where all LEDs in a row have their cathode (or anode) connected to the same line and all LEDs in a column have their anode (or cathode) connected to the same line. In this way a single LED can be lit supplying power to the lines corresponding to its row and column coordinates.
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Replica Board of Samsung Horticulture Gen2 Module
I want to make Replica board of Samsung Horticulture Gen2 Module but with smaller form factor.
I am using 42× LM301H (Full spectrum) and 8× LM351H LEDs.
IF of LM301H is 65 mA and IF of LH351H is 350 ...
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Wiring LP5860 LED Matrix Driver to Arduino Nano
I am working on a project in which I'm trying to control a matrix of RGB LEDs using an LP5860 matrix LED driver connected to an Arduino Nano. I want to make sure I'm wiring the two together properly, ...
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How do pixels conserve their state? [closed]
How do LEDs conserve their state? I'm pretty sure each LED is powered thanks to decoders, but decoders cannot keep a steady power flow through each; every cycle can only light one LED. But once the ...
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Looking for a simple LED direction-type of circuit using leds and resistors--or other?
I'm looking for a very simple circuit, but for the life of me (and my old age!) I cannot find something that I'm able to make work for this project and would like some input from you folks.
I'm ...
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Determining Power Supply Requirements for an 8x4 Grid Display of Chained 32x64 Pixel LED Matrices
I am planning to build an 8x4 grid display using chained 32x64 pixel LED matrices driven by a Raspberry Pi, and I've found mixed information online about the power supply required for such a setup. ...
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Control of 5*5 LED individually with 10 pins
I would like to embroider with electroconductive yarn and I need to light up 25 LEDs but they should work individually (not light up at the same time) and I can use only 10 pins. I cannot use any ...
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Design using 64 SK6812 LEDs - Matrix vs 8x8 matrix
I am designing a 64 LED ring and am curious about the advantages of a matrix design for addressable LEDs.
For example, if I want to use 64 SK6812s, what is the difference between connecting all of ...
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Who is the manufacturer of this LED array?
This is from a Cat6 tracer. It's an LED array and 3 of them have died.
I am looking to identify first who the manufacturer is and then who might be selling it.
When I google it, there are too many ...
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Understand the circuit LED
Help me to understand the circuit
If I power up this circuit, what will happen? Will the LEDs glow or will they be damaged?
LED datasheet link -EAHC2835WD6
LED Lighting - White, Cool 6500K 3.1V 150mA ...
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Mystery LED modules [closed]
I purchased some 50W LED lamps intended for outdoor use. Each module has 70 LED chips, so I suppose they are about 700mW each.
To my surprise they turn out to be pulsed and hence no use for video ...
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HT16K33 alternative for common anode?
I'm trying to drive a common cathode 8x8 bicolor LED matrix (1088AHG) with an HT16K33. However, the seller made a mistake and send me a 1088BHG which is common anode. Later the seller send me a right ...
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RGB matrix 32x16 connected to ESP32 shows only upper half part
I have
32x16 RGB matrix
ESP32 WROOM-32
Power supply for the matrix 5V, 5A
I used this guide to connect them. I just changed some wires. Here is my connection:
In text:
Upper RGB Data
R1 - G25
G1 - ...
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Most efficient and cheapest way to drive a high power and consumption giant dimming LED matrix
I'm building a giant LED matrix for an art project.
Each "pixel" is a 12V RGB LED strip consuming ~23W, and has to be fully dimming controllable.
We're talking about 768 pixels with a total ...
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Best approach to driving custom RGB mechanical keyboard LEDs
I am in the middle of designing a custom mechanical keyboard and have just finished the PCB schematic, but before I spend a few hours placing and routing components, I thought I might ask y'all a few ...
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Ghosting in LED Matrix
Some LEDs light up even if they are not supposed to. The LEDS should spell ECE on the right extreme of the pot, while 3-1 in the left extreme of the pot. So there are two scenarios, either show ECE or ...
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LED Matrix design in Multisim does not work in Tinkercad
We have this design in multisim and it works fine, the intended LEDs works fine in mutisim but when we used tinkercad to simulate, it does not work the same way. It is supposed to spell ECE (right ...
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SN74HC595 multiplexing with MOSFETs
I'd appreciate some advice on a basic circuit. I am using two SN74HC595 ICs to multiplex 64 LED groups, but I need different numbers of LEDs per group, and the total current draw for all the LEDs will ...
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Design of LED Matrix PCB based on the Adafruit 5201 (IS31FL3741)
I am trying to make a LED matrix PCB, heavily inspired on the Adafruit 5201 (which uses the matrix LED driver IS31FL3741). In fact, I would be fine with that board (from the electronic point of view), ...
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How is this capacitance affecting other parts of the circuit?
I'm attempting to drive a matrix of LEDs. Columns. Rows. It flickers too much for my liking, so I tried smoothing the LEDs with capacitors, but I'm getting very odd behaviour.
Here is a minimal ...
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RS232 LED matrix programming
I managed to pick up two 16x64 unbranded LED matrix for next to nothing. My son has autism and absolutely loves LED scrolling signs so I thought it would be a nice project to build for him. They have ...
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When do we need 1500 mA current to drive LEDs?
I saw an LED panel on Amazon with 50 LEDs, see picture. In the description they write that 3030 LEDs are used. I found in the datasheet that the maximum current is 250 mA for this type of LED.
I can't ...
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LED matrix 7x10
I am trying to assemble a 7 x 10 LED single-color matrix using 2 74HC595's for the 10 columns and a CD4017 for the 7 rows. Now obviously I am only going to use a total of 10 pins of the 74HC595 ...
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Grayscale using LED
If I took a regular LED that is either on or off, the brightness of which can be controlled by the amount of voltage it's getting, then at half power I could in theory get a 3rd "shade" ...
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High Bay LED light rebuild
I've got a 200 W High Bay LED light from a friend. Its circuitry is blown up; it was connected to 380 V instead of 220 V, but it also had flickering issues before that.
I would like to build it a ...
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Powering a massive addressable LED project
So a two part question. I've built large scale LED projects in the past, but for the next one it would be massive (a black hole disc with a diameter of 54 ft), and addressable LEDs on the top and ...
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Resistor values for LED matrix
I am designing a binary coded watch with an attiny1616 MCU and an LED watchface. The matrix I designed is displayed below along with the rest of the schematic. The LEDs is 2.1V 30mA and I plan to ...
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Turn an LED on/off LED with a flip-flop counter [closed]
I want to make a 7x7 LED matrix which begins to turn on the first one LED to the last and then turns off the way back (spiral matrix.) I'm trying to turn the LEDs on/off by using signal created by ...
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Do I need a resistor to connect this LED lamp?
I purchased this LED lamp on Aliexpress, the spec says it's 36V, 20W.
I want to know how to connect it to my ebike 36V battery, in particular can I connect it directly or I need a resistor? I tried ...
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Should I continue use daisy chaining or use another Chip Select PIN in MAX7219 8×8 LED matrix module to increase height dimension?
Consider I have 4 daised chaining of MX7219 LED Matrix 8×8. Thats mean i have more width than height (32×8) or (width×height)
If i want improve overal width of LED again, thats mean i must continue ...
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LED matrix power and multiplexing
I am trying to build a 7 character LED matrix (so 5x7 x 7 LEDs). I need it to be controllable from an ESP32 with Arduino code. So far what I've learned is that I need shift registers in order to ...
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Multiplex grid of LEDs with microcontroller
I'm trying to multiplex a grid of LEDs directly from a microcontroller but all the schematics I'm seeing online show how to multiplex to some kind of IC chip or board that isn't the main processor. I ...
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LED Matrix to reduce current consumption
I'm trying to control RGB LEDs via USB. All LEDs have the same color, so I'm controlling them with only 3 PWM signals (generated from a PIC).
The problem I'm facing is to reduce the current needed in ...
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How to use GPIO on STM32 (F103VET6) as a kind of of output battery?
After I learnt how to blink LEDs on the board, I came up with the idea of making a LED matrix.
The schematic is like this:
But I could not figure out how to light it!
Every LED can be lighted under 2....
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How many 2N2222 transistors required for 3x3 LED matrix to mutiplex
I have made a 3x3 LED matrix and was able to turn them on/off individually using an Arduino, but now I want to use an external 3 V instead of the Arduino pin voltage.
How many 2N2222 transistors are ...
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Help me identify pin of this LED Matrix PCB
LED Matrix bicolors (Orange/Green)
PCB board of 10 LED Matrix of 4 x 8 (LTP23548AA-NB)
It looks like J3 is regular UART|USB. I'm trying to find what J1 and J2 are about. The goal is to add a ...
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APA102 LED strips behaving weirdly and flickering towards the end
I am trying to make a 29 x 29 LED matrix to display animations using the APA102 (Dotstar) LEDs with an Arduino MKR Vidor 4000 as a microcontroller. I have connected the data and clock signals of the ...
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Help regarding identification of a DC-DC ic bearing the print "ER=1B 73H" in a faulty BOE-hm185wx1-400 panel
I am having a faulty BOE-hm185wx1-400 panel, where the MLG voltage has dropped to 15 V instead of the usual 25.4 volts. After a bit of diagnosis, it appears that the DC-DC ic below is possibly faulty.
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I need to design 182 RGB LED array circuit
I looked for designs for PWM dimming RGB LED arrays on the internet, and I found this circuit with a current mirror:
As the title says, I am designing an LED panel with 182 RGB LEDs.
I think the ...
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ESP32 on custom PCB - not booting
I have been working on a project that uses an ESP32 board to drive a HUB75E RGB matrix (using the library from mrfaptastic ) . And as an extra challenge, I decided to try and design my own PCB for it.
...
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Clearance between SMD components
I'm designing a compact PCB.
It consists of non-addressable 5050 RGB LEDs.
I'm concerned about how close they are. I'm going to use the SMD assembly service provided by JLCPLB.
Should I change the ...
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LED Array Controller Circuit PCB Design Questions and Feedback
Background
I'm designing a LED controller based on a Teensy 4.1, some AD9833 Function Generators and some TLC5948 LED Drivers. I'm aiming to make an instrument of sorts, specifically a POV display ...
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How to calculate the resistor value necessary for the columns 8x8 led matrix?
I am building an 8x8 led matrix using 5mm LEDs (3.2V, 20mA). I connect it to the arduino UNO through the I2C using the GPIO expander MCP23017. The circuit is as follows:
A matrix column is made up of ...
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Design LED light system, Lumen low
I want to design a 4-way lighting system using LEDs. This is what I have so far.
LED driver: https://www.ledsupply.com/led-drivers/buckblock-dc-led-driver
LED: https://www.ledsupply.com/leds/cree-...
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LED matrix and current sink basics
I'm trying to implement the circuit shown in the schematic below (not complete, just for reference,) where the idea is to turn on only one LED at a time -hence the ADG1406- with a frequency of about ...
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Independent LED control in a matrix
My task is to control 64 LEDs with a 16-output drive. The control of each LED must be individual, that is, the activation of one LED must not interfere in the functionality of another.
I'm using an <...
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Power 100+ 5v LED matrices
I'm trying to power over 100 LED matrices laid out in a long, single chain similar to a stock ticker on news buildings. I do have the control part figured out but bringing power to the matrices is ...
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Powering hundreds of Adafruit's NeoPixels for a cosplay
My problem: I am trying to power a project with a 8x32px flexible matrix, 8x8px flexible matrix, 24px ring, 16px ring and 7px jewel (two of each), totalling up to a whopping 734 pixels. For my project ...
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Is the gauge big enough? String Pixel
I think I might need different pixels or an additional power supply.
I bought 10 strings of 50 (12mm, 12v) pixels (aka WS2811 12mm 12V LED) to do my first matrix project. It says that is uses 22awg ...
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How a rgb led panel ( 16x32) works?
I'm currently working on a rgb led panel ( 16x32 1/4 scan rate ) ( driving with stm32f0)
But i couldnt really understand what do i need to do to light up a specific led.
When i apply one clock to R1 ...
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Wattage of LED based growth light not consistent with LED usage
I have ordered a growth light for my plants. Only later did I realize that it said its a 2kW light, which seemed quite excessive as it is only the size of a small keyboard and not that densely ...
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