Electrical Engineering Stack Exchange
Electrical Engineering Stack Exchange

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.

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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How do filament LED bulbs work, looking very similar to incandescent bulbs?

Filament LED bulbs use very narrow strips containing the LED, which look similar to filaments of an old incandescent bulb: They look like a normal bulb with large "old-style" coal filaments, and are of about the same size and shape as the common…
Volker Siegel
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Calculate battery life

I would like to know how to calculate battery life when using an LED strip. The LED strip is powered by 8 AA batteries in series. LED Current Draw = 260 mA. LED power consumption: 3.1 W. LED Operating Voltage range: 9-14.8 VDC. Please see attached…
A.K
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Is DC 5V and 2A dangerous to me?

I am new to electronics so please forgive me. I am looking at powering a WS2812B RGB strip. Specifically 144 LEDs/ meter. After doing some research I found that 200mA is lethal and can kill. Now, of course, the idea is to not touch the terminals but…
NameIsMarcus
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Powering 20 m LED strips

I'm going to be powering some 20 m of LED strips at 24 V. After testing the strips, I can see that this will draw about 6 A. Of course when inserting power from one side the voltage drop across the strip is large enough to make a significant…
Makoto
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Why does a resistor in my Neopixel data line work at all?

Adafruit's best practices for their Neopixel LED strings say, "Place a 300 to 500 Ohm resistor between the Arduino data output pin and the input to the first NeoPixel." Someone asked about the purpose of that resistor here and I'm reading about…
user358829
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Power MOSFET overheating at 1A

I am building an arduino controlled RGB LED driver by using WS2803 constant current LED driver, TLP250 MOSFET drivers and IRF540N MOSFETs. This is how it looks like: The picture got scaled down so it is harder to see, R3, R7 and R11 are 1k…
Marek
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LED accent light that slowly dims when removed from power source

We've all played with different transformers and power supplies that have an LED indicator that dims before going out entirely when the power supply is unplugged. I'm working on designing an accent light which would involve a translucent crystal…
Thomas
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How to buffer an ATMEGA for millisecond-level power interruption without strange behavior?

I have an ATMEGA328p-pu arduino with an LED + shift-register strip circuit attached over SPI. When it turns on, it increases a variable in EEPROM to advance the display mode. We have the brownout detector set to level 1 (2.7V). There is a 1500…
blkmage
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Large difference between specced values and real values for LED strips?

Recently I bought some "300LED/5meter Waterproof 5630 SMD LED Flexable Strip" i.e. High brightness LED strips from China. In the specifications, it was said that the strip consumes 75W @ 12v, which equates to 6.25A @ 12v. I first tested the LED…
Sasha
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Design considerations for LED strip PWM dimming

A note on my background: I'm a programmer in an electronic design company, starting out with hobby projects. I'm planning to design a PWM LED strip dimmer and colour controller for an RGB/RGBW led strip (yes, this is a hobby project). Before I start…
jaskij
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MOSFET choice for 12v LED Strip and 3.3v Logic

I'm currently planning a project on a low-cost WiFi-enabled RGB LED controller and could use some help in looking over my parts list and general concept. What I'm wanting to do is a build a relatively low-cost, WiFi-enabled RGB LED (strip)…
Robin Heller
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Simplest uni-directional level shifter (3.3V -> 5V)

I want to drive a WS2801 LED strip from a Raspberry Pi GPIO. I have connected the MOSI and CLK pins directly to drive the LED but it is not working as the WS2801 datasheet says that a high level is \$0.8 \times V_{dd} = 0.8 \times 5V = 4V \$ (I am…
soyxan
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Mosfet Driver not driving mosfet

I have the following circuit: The MCP1402 MOSFET driver should be driving the BUK7Y13 N-channel MOSFET at 12V, but I'm seeing a much weaker signal which oscillates around 0.7V, preventing the gate from turning on the MOSFET. The load being driving…
Mike B
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How should I select the resistors for this constant-current application for a 317?

Over at OnSemi, they have a little doc about using a 317 voltage-reg as a current source: http://www.onsemi.com/pub_link/Collateral/AND8109-D.PDF Their final example, providing constant current to an indeterminate number of strings of LED's is…
Jemenake
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5V vs 12V addressable LED efficiency

Despite hours of googling, I could not come to clear understanding how efficiency of 5V addressable LEDs compare to their 12V counterparts. If 5V is supplied to WS2812, and the red LED only needs 2.1V, will the rest 2.9 be dissipated as heat? If…
Art
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