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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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43 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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35 views

Programmatically Controlling RGB Arcade Buttons? [on hold]

At my school, we're putting together an arcade cabinet that we're going to program our own custom games for. The one thing I cannot find is an RGB LED controller that is programmable from code, ...
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2answers
92 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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1answer
54 views

RBG LEDs for visible light communication

What kind of RGB LEDs are used in visible light communication? I want to buy them but i do not know any of those LED product name, model or something.
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1answer
73 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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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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2answers
52 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
145 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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2answers
129 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 ...
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4answers
247 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
74 views

RGB led weird color behaviour (blue except when touched to skin)

I have an RGB LED, which I belive to be the diffuse version of this one: https://www.sparkfun.com/datasheets/Components/YSL-R596CR3G4B5C-C10.pdf, though I am not completely sure, as I bought it some ...
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1answer
65 views

Can you determine RGB pinouts with a multi meter?

I have a Swiftech Apogee XL2 that has an addressable LED inside it. I want to connect it to my other RGB setups but I need to know the pin signals and voltage of the LED. I have a multi-meter at the ...
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1answer
78 views

9X9 RGB Led matrix, design suggestion

I need to drive 80 RGB leds (so 240 individual leds), physically and conceptually aligned as an 8x8 matrix + an additional vertical line and an additional horizontal line. I'd like to drive the ...
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1answer
43 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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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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3answers
57 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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4answers
3k 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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1answer
111 views

Correct way to wire RGB LED Strip

This is a quick and simple question but I was wondering if this was the right way to wire a NodeMCU to an RGB LED strip. I am using IRLZ44N MOSFET's and 470ohm 1/2 watt resistors. I currently have it ...
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1answer
75 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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4answers
222 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
90 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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0answers
25 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
118 views

What power supply do I need for my LED light strips?

My set up is this: Power supply > RGB LED WiFi controller > 1 to 3 cable splitter > 2M cable (x3) > 132.5cm 120leds/m 5050 RGB strip (x3) I contacted the eBay seller about what power supply I would ...
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1answer
92 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 ...
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1answer
120 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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0answers
304 views

How to calibrate color sensor to sense RGB colors on the scale of 0-255 if the color source distance varies from 1-25 cm?

I am currently using a TCS3200 RGB color sensor but the sensed values for same color varies with the distance between sensor and color source. How should I calibrate my sensor so as to get values ...
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1answer
175 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 ...
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1answer
240 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
335 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 ...
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2answers
212 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
62 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 ...
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2answers
148 views

Connecting RGB led to the output of the op amp with resistor

I want to connect RGB led to the output of the LM741 op amp.Do I need to use BJT ? If I don't .Can op-amp provide enough current to RGB? Secondly ,Can I connect 3 pin of the RGB to the output without ...
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1answer
127 views

AVR C 74hc595 rgb matrix multiplexing and brightness

I have built a test matrix 2*2 rgb LED's, common Anode. Connected the anodes into columns, and the Cathodes trough 220R resistors into R,G,B rows. Both go to two different 74hc595 shift registers. I ...
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2answers
756 views

Chaining up 5v LED strips using 5v cellphone chargers [duplicate]

I want to chain up a very long LED strip to a single source of data. I will be using an ESP8266 and about 15 meters of WS2812b LEDs. With about 30 LEDs per meter, I need to power about 450 of these ...
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2answers
233 views

NeoPixel led WS2812B doesn't shine when given equal RGB levels

I was trying to light up WS2812B and it works fine when given RGB code something like this (255, 145, 67). But when I send code like (255, 67, 67) to this diode it doesn't turn on. Similarly if I want ...
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0answers
57 views

RGB led light compared to LCD

Sorry if this is a duplicate, or a bit of a dumb question, but the whole question of colour is rather confusing... also advise on whether this should be migrated. At work I've been tasked with giving ...
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1answer
60 views

Problem with green and blue RGB diodes [closed]

I have a setup of 6 RGB diodes in parrallel, each diode has seperate resistors for each color. My problem is, when i connect the diodes on a 12v supply, all leds and every color works, but when i ...
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1answer
662 views

Very dim RGB LED strip when using MOSFET

I am trying to run an RGB LED strip using an ESP32 but I cannot get it to full brightness. Here is what I've done: I started with a diffused RGB LED and a simple ESP32 sketch. This worked how it ...
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1answer
96 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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1answer
585 views

WS2812B - flickering and artifacts

I have a project that has 48 various lengths of WS2812B RGB tape strips. All 12V. Here is a link to the tape i am using. datasheet I seem to have a lot of flickering at the ends and the occasional ...
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2answers
234 views

Splitting induvidual WS2812B LEDs

My motherboard has a WS2812B header for use in addressable RGB LED strips. However I am not using them for those strips, as instead I would like to use the signal to separately control several other ...
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1answer
109 views

Do I need diodes or resistor for PWM controlle RGB LED?

I am planning to build a custom keyboard, using a pro micro and QMK firmware, and on my plan there would be an excess of 3 PWM pin. So I thought I can maybe put RGB leds on it on parallel. But the ...
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3answers
3k views

RGB LED Strip without microcontroller

I have an RGB Led strip that I want to use for just white light. I currently use an arduino with some transistors to control each colour. I have now no need to have different colours and I think my ...
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3answers
1k views

Why do LEDs have only RGB (Red, Green, Blue) colors why not others? [duplicate]

After some studies I've found LEDs having 3 colors RGB (Red, Green and Blue), I was very interested in this topic so this question is up. The Diagram will tell the colors in LEDs. ...
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1answer
114 views

Wiring an RGB led light array

I'm building a grow light using 100 rgb leds. I know that I need resistors but I don't know how to calculate which ones to buy. Also before I buy the leds I have the choice between common cathode ...
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0answers
111 views

How to get the RGB values from a color sensor which changes color from yellow, green, grey, purple?

I am analysing a color sensor which will be immersed in water and the color of the sensor changes from yellow, green, purple when the chemical properties of water changes. Precautions to get better ...
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1answer
51 views

Switching backlight to RGB in the following monitor C24FG70

I have the following monitor: Samsung C24FG70. Is it possible to change the white led backlights with RGB leds? Possibly the smd APA102 with the following microcontroller: ESP8266. How could i hook ...
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3answers
3k views

Control Simple RGB LED Light Strip With ESP-01 Using Homebridge

What I am trying to do is control a simple 2m 5050 RGB Led Light Strip though a ESP-01 that receives http requests through Homebridge. I am doing this through the better-http-rgb Homebridge plugin and ...
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2answers
1k views

How to map RGB LED to wavelengths?

I've made a really primitive spectrophotometer using an RGB LED and a transimpedance amplifier, and I'd like to fine tune it a bit. Most importantly, I was wondering if it was possible to map RGB ...
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1answer
955 views

ATmega328p driving RGB LED WS2801

I am using an ATmega328p to control this RGB LED module. The ATmega is on an Arduino Uno, but I am programming it in C, without using the Arduino libraries. To power the RGB module I am also using a ...