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Questions tagged [led-strip]

LED Strips come in two designs, both on Flex Printed Circuits (FPC). 1. Simple LED + Resistor versions, typically with multiple parallel segments of three LEDs with matching resistors. 2. Digitally controllable with embedded controllers. Data is wired in series while power is paralleled by segments or pixels. Both have different and similar application challenges.

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37 views

LED strip lights not working properly on DC power

I have a set of LED strip lights that I am attempting to control with an Arduino. When I power the first few LEDs from my Arduino 5V out pin (or 3.3V out pin for that matter) it works exactly as I ...
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23 views

Can I connect 2 power supplies for 16 meters LED RGB strip?

I've bought 2 sets of 10 meter LED RGB strip (7.2w/m) for a room. Then I've cut them to around 8 meters each to get 16 meters. Everything seemed fine but one thing, because it's 2 separate controllers,...
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106 views

What does “Run Power and Ground wires back to the Arduino” mean?

An Adafruit article showing people how to wire up an RGB LED to an Arduino UNO has the warning shown below on its page. For longer strips requiring more than 1 Amp, wire the power directly to the ...
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67 views

Open-loop Buck LED dimming

About this buck LED driver... TL/DR the questions: 1) I intend to drive the FET from a microcontroller PWM via a suitable FET driver. This open loop control scheme seems too simple. Is it a trap? I ...
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56 views

5v 10amp powering arduino and LED strip

I need my 5v 10 amp power supply to power both my LED strip and arduino. I will have the LED strip directly wired to the power supply, then for the arduino I have two ideas - either cut a USB cable ...
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68 views

What gauge wire for 24V, 72W, 8m extension RGBW?

I have a simple question (I think) but I haven't been able to find the answer. I have 4 * 5m lengths of RGBW LED lighting, which is rated at 24V, 14.4W/m. This is the maximum power draw, assuming the ...
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2k views

DIY LED lamp is less powerful than expected

I am making an LED lamp using an LED strip. The LED strip I am using is a 240 LED/m SMD2835 strip, which operates at DC12V, and is supposed to use 18W of power per meter. My lamp is constructed as ...
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56 views

DotStar Micro LED Strip individual capacitor need and PCB questions

I was designing a PCB to make a DotStar Micro LED (APA102–2020 datasheet) strip and I saw that none of the products sold in the Adafruit store that uses these same LED's have capacitors in each led as ...
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28 views

Led strips power supply , consumation and contorller

Hello everyone i am really bad at this stuff, i tried reading a few articles but i can't seems to understand anything. So basically i bought the LED strips from aliexpress that came without power ...
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41 views

Noise and flickering first LED (APA 102)

I'm designing a circuit board to distribute power and data to 8 APA102 strips using a Teensy 3.2. While the first version of my board mostly works, I'm having some issues I'd like to solve for a ...
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1answer
41 views

Is Adafruit's recommendation for led strip driver MOSFET incorrect?

Adafruit's article ( https://learn.adafruit.com/rgb-led-strips/usage ) states that transistor IRLB8721 can be used with 3.3V or 5V gate voltage to drive LED strip. However, in IRLB8721 datasheet ( ...
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57 views

LED Controller + LED Panel with common cathode

I have a 3-CH DMX controller (5-24V, 5A/ch, common anode) from amazon (don't know if links are desired here) and a 12V 100W MCPCB LED panel, which unfortunately has a common cathode. The panel is ...
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24 views

LED dimmer/controller: preserve state after loss of power? [closed]

Summary: Are there LED Dimmers that are "always on" and whose settings survive loss of power? Details: I am considering a more or less standard led-strip set (consisting of power transformer/driver,...
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1answer
35 views

How to wire DotStar LED strip with 6 wires at the start of the strip

I bought some of these LEDs: They have six wires at the start of the LED strip. I thought that perhaps the separate red and black wires were to power the LEDs, and that, for the 4 wire JST, the black ...
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2answers
73 views

antiparallel led circuit

Is it possible to glow the both LEDs simultaneously in an anti-parllel circuit? I tried with H-Bridge but I am not able to do it simultaneously. Please help me to solve this problem
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1answer
66 views

Power supply question in regards to powering 400 LEDs

I have WS2812B LED strips, that has 144 LEDs per meter. The ratings are: 43W/M .3W/LED .06A per LED Input Voltage of 5V DC The recommended power supply stated by the website is 5V DC and 10A for 1 ...
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0answers
41 views

Isolated vs non-isolated boost converter for LED (12v to 24v)

I have a 12v system in my motorhome and planning on installing 24v LED strips, however, I'm unsure whether I would need an isolated or a non-isolated boost converter. I'll be using roughly 5 meters ...
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1answer
42 views

Choosing correct relay for LED power supply rating

I have a 500W 24V power supply for running 24V LED strips. The power supply says it's rated for ~21 amps (500W / 24V). Assume input is US 120V household power. I want to control the 120V supply ...
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1answer
109 views

Powering 9216 leds @5V, @24V with converters

I am struggling with a power supply question. I would like to power up and control 9216 LEDs -- strips of 144 LEDs/meter (WWA SK6812 - just like the RGB kind). These are powered at 5V and draw 43.2 ...
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2answers
142 views

Powering 30m of RGB LED strips?

I'm currently interested in following this tutorial which explains how to create a homebridge (ESP8266) controlled 12v RGB strip which is exactly what I've been looking for. However, whilst I do ...
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53 views

How to make this circuit to use a single USB for programming and charging?

everyone, I am making a simple circuit with a led strip (ws2812b) 1 using a wemos d1 mini clone (esp8266) [2] and a lipo charger usb module (TC4056A) [3] here is the breadboard diagram in fritzing: ...
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36 views

Multi White / Tunable White LED Strip

I have a question regarding multi-white (warm white and cold white) LED strip. There are 2-wired multi-white LED strip and 3-wired multi-white LED strip. 2-wired LED strip has a positive and negative ...
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1answer
56 views

LED strip driver using Standalone atmega823 and MOSFETs

I want to make a LED strip driver, using an atmega328 on a custom PCB. I was able to get it to work perfectly using an arduino UNO, with the mosfets connected on a breadboard. However, when I just ...
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1answer
190 views

LED strip without controller

anyone knows if it's possible to use a led strip with 3 pins without a controller? I got this 1,5 meter strip without controller, I don't know if I should've bought it or not... please see attached ...
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43 views

LED setup, general questions regarding amps

I'm trying to fully understand the limitations of amps when using a few various devices. I tried to understand amps via this post: Voltage at what Amperage Specifically: So, the possible ...
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2answers
70 views

Swap between two colors without an additional light?

A Quick Note I'm not sure of a more accurate name for this question. If you can think of a better name, feel free to edit and change the name. Also, I'm not the greatest with technical terminology so ...
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1answer
42 views

Display Amber/Orange on LED Strip with no control module?

I have a set of LED strips that have the following four wires: Positive Negative Red Channel Blue Channel Green Chanel Given these wires, I can produce the following colors without additional ...
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1answer
100 views

Normally On Circuit with Positive Trigger?

Pardon my lack of technical terms here; essentially I have an under glow kit on my car (along with some other lighting) that I want to expand the circuit on. I bought a pair of 5 pin relays to ...
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4answers
246 views

What is the RGB value of Edison Light Bulbs? [closed]

I've been doing a little electrical engineering (outside of my lane a bit). I'm trying to get the RGB values for Edison light bulbs. Can anyone provide me with those?
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3answers
148 views

High power LED strip power distribution

I want to power 20 RGBW LEDs. Each of these lamps and each color channel should be individually controllable with PWM. Since it concerns pure LEDs without internal control I would like to use a ...
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2answers
121 views

How to make rgb LED strip digitally addressable [closed]

I'm planning to install rgb LEDs srip on each steps of stair, there are total of 19 steps and I want to control each strip individually so I need 3 for rgb and 19 for each strip that makes 57 pwn ...
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3answers
383 views

Connecting multiple Fairy lights in parallel to single power source

The above diagram shows how I'm about the connect the LEDs, info regarding the drop forward voltage been taken from: Calculating forward voltage for a string of fairy lights: multimeter shows "1&...
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2answers
551 views

Is a resistor required to power a LED strip with a 9V battery?

I have a 7020 white light LED strip, which includes a resistor on each module as you can see: I would like to power a little strip of five of these modules with a 9 V battery, but I wonder : 1- Do ...
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2answers
64 views

Problems extending a 12V power lead to an RGB-LED strip

I need advise on the following problem: I am connecting a 5 metres WS2812B based RGB-LED strip to an extension cord. This is a 12V version, where two LEDs are coupled in terms of their addressing and ...
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2answers
55 views

Controlling RGB led strip each color with a switch

I am creating a picture frame that will have RGB led strip surrounding the frame. There is no room for controller. Is it possible to wire a switch between every color cable so I can manualy turn on ...
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1answer
67 views

How can I power a USB cord from a 12v 2a power supply?

I'm new to the forums and have a problem I cannot find an answer to. I am making a lamp with LED strips inside powered by a 12v 2a power supply. I want to also power a USB cord with this power ...
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1answer
45 views

PC power supply for 12v 24A consumer, question on 12v yellow wires

I want to buy and convert a 350W PC power supply into a 12v power supply for 20m RGBW led strips. I want to do this because I did not find any reasonable priced 12v power supply and simply because I ...
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2answers
145 views

Running 20 WS2812 LED strips (80 pixels each) from a single Arduino and 24V Power Supply with Buck Converters

I am building a matrix with 20 WS2812 LED Strips. Each strip is 80 pixels for a total of 1600 pixels. I want to drive them all from a single Arduino Mega board. To handle the power needs, I have a 24V ...
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1answer
49 views

LED strip appropriate for fiber-optic cables

A project will use 20 fiber optic side-glow cables, 3mm-thick, with one controllable LED each. A WS2812 LED strip or similar would be perfect for the ease of controlling the LEDs, however all that I'...
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2answers
82 views

Measuring junction temperature of LED tape?

My boss at work wants me to figure out a method of measuring the junction temperature of an LED that is part of a reel of tape. Unfortunately, there is no datasheet for the LED modules themselves, ...
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1answer
48 views

Design of low voltage outdoor LED light system

This project is on my boat which has 3 Group 27, 12V batteries in series which is my house power source. I want to power approx. 510 LED lights from my 12V house batteries. The lights are taken from ...
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1answer
87 views

Dim a LED array through PWM on power supply or output enable?

I have an 8-LED array driven by an 8-channel source driver (TD62783AP) controlled from an 8-bit shift register (74HC4094). When it comes to dimming the LEDs using PWM, I came up with two solutions, ...
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3answers
137 views

Combine Power Suplies?

I'm not sure if this is the right place to ask, but I'm building something and am not sure about how to power it (I have zero electricity knowledge). I'm building out three individually Gledopto ...
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1answer
91 views

Is it possible to use a raspberry pi to control these LED strips?

I want to control some LED strips (inside PVC tubes) with a raspberry pi. Is this possible? Where would I start? The problems are, I don't have a lot of info about the strips: LED Chip Model:SMD5050 ...
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2answers
223 views

LED Hissing issue with circuits [closed]

I have just recently designed and manufactured my very first PCB with the goal of it being a dedicated circuit to my project. I developed an ESP8266 WiFi Mood Light, but the problems I currently face ...
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2answers
227 views

MOSFET does not turn off totally

UPDATE: If your MOSFET (or other chip) does not behave well AND you bought from not-really-known seller (even if his/her positive feedback ratio is over 99%) for a very competitive price, MAYBE you ...
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2answers
373 views

Safety of “UV” LED

I am curious as to whether LEDs like these ones http://www.led4everything.com/catalog/product/view/id/410/s/st0028/ are harmful, they are advertised as UV. But are they just purple LEDs or actual UV? ...
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1answer
523 views

WS2813 LED strip without controller

I bought recently the LED strip WS2813 ( http://www.normandled.com/upload/201605/WS2813%20LED%20Datasheet.pdf ). I use a DC 5V 20A power supply. I soldered the V+ output to the +5V entry of the LED ...
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2answers
79 views

Unreliable switch on string of LED lights

I have a string of LED lights (think Xmas tree lights) powered by a wall wart (3.2V 1A) and turned on and off with a simple inline rocker switch I had troubles with the lights flickering and ...
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2answers
85 views

How to best choose a method of driving a MOSFET

I want to be able to control 12V as well as 24V LED strips that will be used in a video recording environment (so high switching frequency). In a few bullet points I will explain the planned circuit: ...