Questions tagged [rgb]

Short for: Red Green Blue. The primary colors in light. Mix them to create any imaginable visible color of light. Questions are typical in reference to RGB Leds, RGB Led drivers, and code related to mixing RGB light, but can include RGB Video Standard in VGA monitors.

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1answer
223 views

Why can the IS31FL3731 only handle 32 RGB Leds when it can handle 144 Regular ones?

I am looking at using the IS31FL3731 IC in a project soon, but I am confused as to why the data sheet says that the circuit can only use 32 RGB LEDs when it can use 144 regular LEDs. The data sheet ...
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2answers
91 views

TFT RGB LCD construction and

I am trying to understand the construction of an RGB TFT LCD that has brightness control in it. I could not understand how does the TFT color LCD pixels glow? Does each of the pixel has its own light ...
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0answers
47 views

Is there a physical (electronics) difference between Hue White and Color and Hue White Ambiance bulbs?

I'm curious if anyone knows if there's a physical difference between a Philips Hue White and Color bulb, which allows the user to set a complete range of RGB colors including white light color ...
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4answers
3k views

Why must resistors be on the respective anode terminals instead of the common cathode terminal of a RGB LED?

Different from the best answer of this one: Why does a resistor need to be on the anode of an LED? But well, I'm also an electronics noob ^.^ Recently I bought the official Arduino starter kit and ...
4
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1answer
6k views

Read and decode .led file

I'm working on a flexible LED screen persisting of 20 meters of digital RGB LED strip with WS2811 IC for each LED. I want to control this using Arduino, which isn't a problem using FastSPI. My ...
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3answers
239 views

multiple RGB LEDs with common resistors for each color

I am modifying a pcb with 9 RGB LEDs having three resistors each normally. I know that it is the proper way of doing it. However what is the disadvantage of connecting them as below? Resistors being ...
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0answers
115 views

How to convert arcade RGB video (2-5v p-p) to VGA (0-0.7v)?

I'm trying to convert arcade video signals (JAMMA) to VGA specifications. From what I've gathered, arcade video signals aren't standardized. They can range from 0v-2v or 0v-5v, etc. However, VGA ...
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1answer
4k views

Driving a RGB Led strip with a RGBW controller

I have a RGB LED strip (Common +) that I want to drive using a controller that expects the strip to also have a W (White) channel. So what I am basicly looking for: As soon as the controllers W ...
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1answer
68 views

Arduino RGB spectrum problem

Over the last few days I've been working on an anode RGB LED in Arduino, I've tried getting it to do an RGB spectrum but all I would get is just the colors from red to green, then it would get stuck ...
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1answer
97 views

30 Meter in series LED SMD 5050 60 led/m 12v RGBW

I want to run 30 meter Led length in series in a room on the ceiling. LED specifications (according to the supplier:) LED Type: 5050 RGBW LED Light Strip Quantity: 60 LEDs / Meter Working Input ...
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2answers
5k views

Why can't RGB or bicolour LEDs produce a decent yellow?

I have several different RGB LEDs and bicolour red/green LEDs, from different suppliers. I find that, with the appropriate resistors, they can produce a perfect orange and cyan; and a barely ...
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1answer
112 views

Using WS2812b LEDs in series [closed]

I'd like to convert some of my PC case fans to be compatible with Corsair's RGB system to fit with other case fans. Corsair has an RGB fan hub that allows you to connect RGB fans to it, then connect ...
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1answer
78 views

Power multiple parts of one project from one wall wart

I'm building a project with a high-power 10W RGB LED controlled by PWM from a microcontroller. Right now I'm using a wall wart to power the LED, and powering the MCU through my computer's USB. My ...
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2answers
343 views

RGBS sync signal

How are the hsync and vsync signals encoded in the sync signal in a 15 KHz RGBS? I'm trying to view an old 8-bit computer with RGBS on an VGA monitor through an RGB to VGA converter. As it displayed ...
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5answers
7k views

Red Green Blue LED

Do you need to use different resistors against each of the colours on an RGB LED?
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0answers
129 views

NeoPixel THT: Varying pinouts [closed]

I am in the process of designing a PCB for a solder kit that receives NeoPixel type LEDs, the ones with the short head: Now, there seem to be different pinouts: Ordered on Amazon.de as WS2811 LED ...
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2answers
164 views

Best way to power LED strip (180 LEDs)

I'm assembling this addressable RGBW LED strip setup that is 3m long and 60 LEDs/m. I have found no answer to my two questions on other sites or youtube. (This is the strip I'm using: https://www....
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2answers
76 views

How do I interpret an RGB LED max amperage given as a range e.g. 30mA-70mA?

I have some LED's I got in a mixed package and the RGB LEDs instead of a single max amperage just list a range. One example is I have a common cathode RGB LED with ratings listed as 1.9-3.4v and 30mA-...
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5answers
45k views

What resistor to use with this RGB LED?

i have this led, and im not sure what resistor to use to drop the 5v current to an appropriate voltage and produce the appropriate current. the LED is rated at 200mA, but the data sheet says i should ...
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1answer
177 views

Series and parallel RGB LED work abnormally (cross light up)

I am trying to make a msp430 controlled Bluetooth RGB lamp. The program works perfectly right now. But the problem is: when running for a while or as soon as I connect the led driver power supply (I ...
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2answers
497 views

Power consumption NeoPixels vs. direct control?

At Maker Faire Berlin 2018, an electrical engineer looked at my project which was shown with NeoPixel LEDs (WS2811). He mentioned that the NeoPixels waste a lot of energy. It would be better to build ...
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2answers
125 views

Control the RGB tape with only one output of the microcontroller

I need to control the colors of an RGB ribbon. This requires 3 PWMs. But I have only one output of my microcontroller available. So for this I need to find a circuit that stays between the ...
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5answers
10k views

Why do some RGB LEDs have six legs?

Others have four legs, which makes sense to me, as ground can be shared. One of many examples of a six legged RGB LED is the Kingbright KAF-5060PBESEEVGC.
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1answer
417 views

RGBW Cree XM-L LED power circuit HELP!

I have 10 Cree XM-L RGBW LEDS and I would like to power them from a 12V power supply. I came up with this idea: A 12V 30 amp power supply powers 3 different step down buck converters (10 amps each ...
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0answers
35 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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2answers
2k views

ATtiny25 PWM LED driver with brightness control

I'll be building a piece of RGB LED jewelry for a gift. It's basically a pair of earphones with one or two RGB LEDs on each, with a small ATtiny25-based PWM driver in a small enclosure. I'll probably ...
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1answer
79 views

Spliced LED Strips with Pre-Fab Controller [closed]

I need 2 meters of high density LED strip for a project, but high density strips are often only sold in 1 meter increments. I'm thinking of buying two strips -- of one meter each -- and soldering ...
2
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2answers
196 views

Will this MOSFET be suitable for driving a 12V 1-2A Load from an Arduino?

I have an Analog 12V RGB LED strip (which only requires 1-2 amps at most) that I want to control using an Arduino Uno. I looked into how I could go about doing this and saw that i could use several ...
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2answers
1k 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 ...
3
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2answers
740 views

TLC5940 - with 200LEDs from car battery

I'm working on project that involves 100 white and 100 RGB leds, controlled with 25 TLC5940. I've managed to connect three TLCs to Arduino MEGAv3 and so far so good. I've found out that I have to add ...
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4answers
2k 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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1answer
198 views

Inverting current flow of RGB LED

The board I created uses the WS2811 which outputs a 12V RGB signal, with the high signifying an inactive LED and the low being full brightness. The components connected to this receive a 12V power ...
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1answer
148 views

RGB LED Commond Anode Configuration

I am trying to create a schematic for driving two WP154A4SUREQBFZGC RGB LED diodes using ON Semiconductor's CAT3626 and here is my schematic: and here is proposed circuit from ...
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4answers
4k views

Can I replace these many capacitors with just one?

I'm designing a schematic for an addressable RGB LEDs array and I've chosen the WS2812B because of how common and cheap they are. Looking at the typical application circuit, I noticed there is a ...
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5answers
899 views

Minimizing PCB size of a 192 RGB LED array

I'm working on the design of an LED lamp house for my film scanner. I need RGB LEDs, plus IR LEDs. I'm figuring on a 2"x2" grid of SMD LEDs. Datasheets for the ones I'm using below. The current design ...
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4answers
680 views

Driving 10W RGB LED Red Channel Issue

Been a while since I have been on here but I do not know where else to turn for help! This is more of a hardware issue than anything so i do hope that I am in the correct forums to be asking, if ...
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0answers
501 views

Red divider resistors for 5050 RGB strip coming from WS2811 chip

To split up a WS2811 data signal into discrete 5050 RGB 12V LED signals, I followed the example on the WS2811 datasheet and hooked up its outputs to a separate power supply. This example shows one ...
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1answer
4k views

Converting DisplayPort to 24 bit RGB parallel. Possible?

Is it possible to interface a DP1.1 complaint source to a TFT Module that uses 24 bit RGB? I'm investigating the possibility of interfacing an Atom D2550 with This Display. I have 3 options to ...
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2answers
553 views

Li-Ion battery for RGB strip

I am looking to power up my Teensy LC and my RGB strip from the same power supply, which is a 3.7V Li-Ion battery 3000mAh. The teensy can work perfectly fine with 3.7V. The problem is when it comes ...
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0answers
47 views

Analogue Video Trace Matching

I'm working on an analogue audio, video and sync board for my Dreamcast. Something I've been wondering about is the tolerance for analogue video, specifically RGB, in regards to the delta for trace ...
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2answers
4k views

Is it possible to use a ULN2003A Darlinghton array instead of multiple TIP120 transistors?

Looking at the datasheets, I'm not sure their specifics match; TIP127 and ULN2003A My intention is to do something like this, but with the ULN2003A, that I have already: The reason why is that I ...
2
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1answer
2k views

Converting RGB composite output to VGA

We've got an old Arcade machine at work that we're busy converting to being powered by a PC running an emulator. The controls have now been sorted, and audio should be a breeze. Remaining is hooking ...
2
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1answer
268 views

MOSFET always slightly on and other strange behaviour

I'm trying to control my RGB LED strip with my arduino, using IRLZ34N MOSFETs according to this schematic simulate this circuit – Schematic created using CircuitLab I tried it out, everything ...
2
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1answer
235 views

Why is my RGB LED strip passing current through the transistor?

I am following this schematic: http://www.electronoobs.com/eng_arduino_tut13_sch2.php It uses a BD140 PNP transistor. I checked the wiring was correct. Basically, the transistor boosts the current ...
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1answer
304 views

12V DC DMX LED Controller needs to be reduced to 5V

I need a bit of help for a lighting project I am undertaking. I have a couple of 12 volt DMX LED controllers driving various zones in a bathroom with LED strip. I want to replace the controlbox for ...
2
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2answers
13k views

Can I use a 25 meter LED stripe with a single power adapter?

I have 5 stripes of 5m length and 300 RGB LEDs (type 5050) each. One LED consumes about 20 mA at 12 V. Therefore, my whole 25m setup would use about 30 A. Is it safe to connect the 5 stripes series ...
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1answer
658 views

Wiring RGB Vandal Switch as PC Power Button

I'm trying to wire up a Schurter CPS16 capacitive, multicolour (RGB), anti-vandal switch to my PC for use as a power button. The switch function is momentary and normally-open. Tech Sheet I'm just ...
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4answers
828 views

Toggle between two colors in a common-cathode RGB LED using a SPST switch

I'm working on a switching circuit for a guitar amplifier that uses one DPDT relay which is powered by 12V DC supply. A SPST switch (panel mount or footswitch) will power the relay and switch to a ...
3
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2answers
450 views

hack color changing candle circuit

I'd like to modify a color changing candle (example) circuit so it can be turned on without lighting the actual candle. It uses a photodiode and a optical fiber alongside the wick to cycle the RGB ...
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1answer
10k views

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 ...