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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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How to apply a thermistor to my LED driver (TLC59116 PW package)

I currently use a TLC 59116 16-channel I2C LED driver in a 4 x 4 LED array driven by Arduino and would like to add a thermistor to the circuit design. I'm unsure where to add it or what supporting ...
Mak's user avatar
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1 answer
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What is the point of two enable signals in PT6957 LED driver?

I have a 48 x 16 matrix LED display E-MOTIVE Q-B-069B (no datasheet), and during reverse engineering I found 4 off PT6957 there. PT6957 is 16-bit shift register, latched with constant current drives. ...
smajli's user avatar
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2 answers
62 views

Why am I measuring 1e6 ohm forward resistance on a functioning LED? [duplicate]

I have an LED board with a busted driver, so I thought I'd probe the LEDs to determine a good replacement driver. If I probe the LEDs I don't get a readout on the voltage drop but the LEDs light up ...
Sebastiaan's user avatar
3 votes
1 answer
111 views

Troubleshooting a HT16K33 + 14 segment LED showing segments when not addressed

I'm working with a board that has multiple 14 & 7 segment displays all being addressed using an HT16K33 where various segments are either not displaying or are being lit when they shouldn't. In ...
nageeb's user avatar
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2 answers
60 views

PWM vs mutiplexing, why one can control the apparent brightness and other saves power?

In an LED grid where we are using multiplexing to control a ton of LEDs, where we are scanning each row quickly and using persistence of vision to enjoy the full picture at once; let's say that there ...
Rajveer Singh's user avatar
1 vote
1 answer
67 views

RGB LEDs indvidual brightness control [closed]

i want to make RGB LEDs panel using https://www.lcsc.com/product-detail/Light-Emitting-Diodes-LED_TCWIN-TC5050RGBF08-3CJH-P35C_C784539.html RGB LEDs. I will put 100 LEDs in tha panel and want to ...
Zunuran Nasrullah's user avatar
1 vote
1 answer
70 views

Trying to overdrive LEDs my power supply amperage mysteriously "backs off"

I have a 48 parallel matrix of 3v LEDs. I'm trying to overdrive it. I set my supply to 3v and 0.5amps and the display glows. Up the amperage to say 1amp it gets brighter. So far so good. I keep ...
jackisquizzical's user avatar
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3 answers
172 views

Eliminating Noise from Audio Amp Board Input

I made this project by shajeeb (linked below), and I am having trouble with noisy ground lines. The circuit I made is the same as the diagram below except for where I connect the speaker and amplifier ...
Jameson Gatewood's user avatar
2 votes
1 answer
115 views

MAX7221 with multiple LEDs per point

I am using a MAX7219/MAX7221 chip in a keyboard design in order to light up the individual keys. The keyboard is going to have exactly 64 keys so with the 8x8 matrix the chip handles I will be able to ...
SukkoPera's user avatar
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1 answer
60 views

LEDs in parallel with low voltage input source [closed]

Could you please help me understand below circuit in detail. What could be the voltage at testpointA if LED forward voltage drop is 2V?
Micro's user avatar
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2 answers
249 views

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 ...
Zunuran Nasrullah's user avatar
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0 answers
146 views

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, ...
brasdos's user avatar
2 votes
4 answers
201 views

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 ...
qkasriel's user avatar
0 votes
5 answers
96 views

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 ...
Chris Clement's user avatar
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1 answer
48 views

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. ...
Jordan's user avatar
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0 answers
57 views

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 ...
James Smith's user avatar
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1 answer
49 views

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 ...
gaebalsagae's user avatar
2 votes
1 answer
107 views

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 ...
Rohit Gupta's user avatar
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1 answer
115 views

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 ...
Ram_R's user avatar
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2 answers
94 views

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 ...
danmcb's user avatar
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0 answers
138 views

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 ...
Leo's user avatar
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0 answers
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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 - ...
Dzam's user avatar
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1 vote
0 answers
121 views

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 ...
MakerCult's user avatar
0 votes
0 answers
104 views

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 ...
mistasef's user avatar
0 votes
1 answer
174 views

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 ...
Wolfram's user avatar
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1 answer
109 views

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 ...
Wolfram's user avatar
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0 answers
118 views

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 ...
The Lamb's user avatar
1 vote
2 answers
98 views

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 ...
Sod Almighty's user avatar
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3 votes
1 answer
503 views

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 ...
d0little's user avatar
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3 votes
3 answers
1k views

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 ...
Tea is life's user avatar
0 votes
1 answer
63 views

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 ...
Lucio Mazzini's user avatar
5 votes
6 answers
3k views

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" ...
Chadley123's user avatar
1 vote
0 answers
239 views

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 ...
Jacques van der schyff's user avatar
0 votes
0 answers
61 views

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 ...
lakerice's user avatar
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1 vote
4 answers
283 views

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 ...
AWESDUDE COOL's user avatar
-2 votes
1 answer
398 views

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 ...
Tri Nguyen Minh's user avatar
0 votes
7 answers
377 views

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 ...
exebook's user avatar
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1 answer
215 views

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 ...
Muhammad Ikhwan Perwira's user avatar
0 votes
0 answers
211 views

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 ...
Francesco Antonio Miccoli's user avatar
1 vote
3 answers
311 views

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 ...
e3rowning's user avatar
2 votes
2 answers
277 views

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 ...
BadApples_'s user avatar
1 vote
1 answer
384 views

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....
RedRabbit's user avatar
1 vote
2 answers
236 views

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 ...
PraveenMax's user avatar
-1 votes
1 answer
81 views

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 ...
Bobby's user avatar
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1 vote
2 answers
536 views

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 ...
Anon_1100's user avatar
0 votes
0 answers
386 views

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. ...
Abhishek Ghosh's user avatar
1 vote
0 answers
156 views

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 ...
박성재's user avatar
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0 votes
0 answers
279 views

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. ...
Bogd's user avatar
  • 175
0 votes
1 answer
750 views

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 ...
John Cortex's user avatar
1 vote
0 answers
145 views

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 ...
wootie11's user avatar

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