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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395 views

RGB LED inverted logic Arduino

I followed this instruction, but I found that it doesnot work (the RGB LED is off). So, instead of connecting the long leg of RGB LED to ground (-), I connect it to the 5V source (+). And, it works. ...
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1answer
2k views

How do I calculate capacitor size in relation to LED quantities?

According to the NeoPixel best practices (which is the exact product I'm using): Before connecting NeoPixels to any large power source (DC “wall wart” or even a large battery), add a capacitor (...
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2answers
579 views

Using 2 I2C RGB Color Sensors in Arduino

I want to use two I2C RGB color sensors (TCS3414-A) in Arduino, but I cannot figure how I change his adresses and I'm asking this because I want them both in use. They come with 0x39 as default ...
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1answer
1k views

Please review my first PCB schematic | ESP8266 + led-strip

I wanted to create module based on ESP8266 to manage led-strips. Since I have both RGB(WS2811) and white LEDs I wanted to create universal PCB to be able to use both kinds of strips. Here is ...
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2answers
109 views

Could You Use Common cathode RGB LED without providing power to G and B

I know this kind of defeats the purpose of an (common cathode) RGB LED, but if you only wanted Red on a RGB LED would it be acceptable to use only the R pin and the Cathode pin to get just red? Sorry ...
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1answer
182 views

RGB LED Light Strip - Arduino

I've purchased a small WS2811 5050 RGB LED strip. I want to light them up without any controller currently. But I'm struggling to do that. The strip I'm using: http://www.ebay.co.uk/itm/201709948864?...
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0answers
2k views

How calibrate an RGB LED to get correct color mixing [closed]

We are using RGB LEDs in our product and we require to emit white light to indicate a certain state. But because of the tolerance of the resistors and the LED itself it is hard to achieve the same ...
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2answers
1k views

Raspberry Pi - Controlling Multiple RGB Led Strip

I am able to control an RGB LED strip using Raspberry Pi, using 3 x TIP120. However, I would like to add multiple strips, maybe about 7 to 10 RGB LED strips. I will use 12V 30A power supply. I am ...
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1answer
138 views

High power 12v regulator

Hi i am new to the forum and this is my first question so fell free to help me with formatting. I am working on a project that involves controlling RGB LED strips from a Arduino. I have as my power ...
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1answer
778 views

WS2811 RGB LED with arduino

I need to get this model of RGB working with Arduino , I can't find this model on the internet , it's says 12volts. I need to know how to hook it up ? and if there is an Arduino code that would be ...
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1answer
262 views

I am trying to use a LM324 4 channel opamp to create RGB color fading

Based on this design http://www.moddingtech.de/tutorials/44-lichteffekte/66-led-fader.html The LM324 has 4 opamps, this design is only using 2. In the design one opamp is the timing circuit and ...
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2answers
71 views

What type of switch should I use?

I have two signal lines, both will be running at the same time on a PCB. RGB lines running at 75 ohms impedance -0.3-+0.7v (1v). (Standard video lines). Currently both lines are active/running/...
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2answers
745 views

Use an op amp to remove negative signal

How would I configure an op-amp to filter out the negative portion of a signal. Would it just be to put the negative supply of the op-amp to ground? I wish to do this with the 200MHz EL1801 op-amp to ...
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1answer
120 views

Delay an 75 ohm rgb signal

I'm looking to add a controlled amount of delay to some 75 ohm impedance RGB lines. The signal will be an AC sginal. I'm looking for about 30 ns so would something like the Maxim DS1135 be a good chip ...
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2answers
3k views

How much does an op-amp delay?

I will be using the OPA694 for some video processing. I would like to know how much delay it introduces, so I can account for it. Here are some specifications of the op-amp: ...
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2answers
420 views

Single supply op amp that can swing -0.3v and output -0.6v

I'm limited to a single +5v rail and ground and so could anyone recommend an op amp which could swing atleast 0.3v below its negative rail and that would be able to amplify by atleast 2 (capable of -0....
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1answer
719 views

Creating a RGsB to RGBS converter

I am currently trying to create a circuit which will convert a 75 ohm Green RGB line with sync (sync on Green) to just Green. I will attach a very basic diagram. My question is will the latency cause ...
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2answers
414 views

IC which can drive an RGB input to two outputs

Is there a way to duplicate a wire from an RGB source without degrading the signal. I wish to take a wire and split it into two wires without the current halving. (edit) 75 ohms and one RGB signal ...
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2answers
610 views

Where do the RGB LED matrix resistors go?

I have a number of 8x8 RGB LED matrices. Each has 32 pins, and you could (barely) characterise them as common anode - all the anodes in a row are common, but so are all the Red, Green and Blue ...
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1answer
454 views

Connecting a single-colour LED strip to a RGBW controller [closed]

I have a RGBW strip that is connected to a RGBW controller; Is it possible to connect a single-colour strip (rated at the same voltage) to the same controller? If so, how? Thank you for your answers. ...
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1answer
155 views

high power rgb led current matching

i've picked up some 10w rgb leds with the following specs: DC Forward Voltage (VF):Red 5.4-6.6V;Green 8.7-9.3V; Blue 9.0-9.6V. DC Forward Current (IF): 300-330mA i would like to drive several in ...
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1answer
285 views

Pulling RGB24 signal out directly instead of LVDS interface

I am designing a display driver board. I have used a HDMI receiver ADV7619 for the same, I am using HDMI input to my board coming from PC. This receiver has RGB and YCrCb signal out. I have already ...
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2answers
18k views

How much current do I need for a 5050 RGB strip? [closed]

I want to use 5 meters 5050 RGB Waterproof 300 LED Strip + 20 Key Music IR Remote Controller Sensor. Is it okay if I use a 12V 6A Power Supply?
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1answer
670 views

Connecting Cathod Commond RGB Leds in parallel with arduino

I'm just starting with arduino, and want to light up 2 RGB leds (common cathode), and just think that the only thing I nedd was connecting them in parallel, no extra parts (my mistake), then I read ...
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1answer
369 views

Motherboard RGB diode control and resistance?

I've recently acquired a new motherboard for my PC which features RGB strip control. That's well and good but I have particular need to control a single RGB diode with that same header. The issue I'...
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1answer
5k views

Common Cathode vs. Common Anode (RGB LED) [closed]

What is the difference in power consumption between these two RGB LED circuits, one common cathode, the other common andode?
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3answers
2k views

Issues with NPN Transistors and RGB LEDs (Common Anode)

I have a question regarding the use of NPN transistors in an RGB LED (common anode) circuit connected to an Arduino Uno. I have spent the past several months developing LED color control software that ...
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0answers
104 views

Will a monitor work if I make a VGA cable with common return and ground? [duplicate]

This has been bugging me for a while but will a monitor unit work if I make common ground for returns for RGB and the ground? A bit scared to test it on my monitor.
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2answers
2k views

How can I stop the flicker of LEDs?

Recently I started messing around with controlling RGB leds with the Arduino for a project I'm building, so I built the following schematic: simulate this circuit – Schematic created using ...
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2answers
3k views

LED circuit is draining AA batteries REALLY fast

My question is long, rambling and weirdly specific. I hope I'm not violating like 50 stackexchange rules, but I'm completely lost. Long-time lurker, first time asker and pretty new to circuits in ...
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1answer
729 views

How to control a common-cathode RGB LED matrix with Arduino?

I have the Arduino Uno board, and I want to create a 17x31 RGB LED matrix. Unfortunately, I wasn't patient enough and already bought the LEDs, and I purchased common-cathode LEDs without doing much ...
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1answer
1k views

Can 5630 SMD on LED strips be RGB?

Hi I've been trying to look online for RGB 5630 LEDs strips but I can't find any. All the strips I've found carried 5050s which give a max of 1020 lm/m more or less.. Any idea if strips carrying ...
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3answers
323 views

Multiplexing 2 times 4 CC RGB LED's

I need to make 2 sets of 4 Common Cathode RGB LEDS. In each set of 4, every led must be individually addressable. It doesn't matter if both sets have duplicate outputs or not. (Although optimally they ...
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3answers
509 views

Diode destroys square wave?

I was developing a footwell controller for my car, using RGB LEDs for the lights, an Arduino Nano for RGB controlling and an auxiliary PWM generator (pure white lights) when the Arduino is off. The ...
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1answer
5k views

Long term reliability of addressable RGB LED strips? How do WS2812B, APA102, and SK6812 compare? [closed]

I'm about to order a lot of RGB LED strips for a project that will hopefully be running for years if not decades. I used to have very good luck with strips using the WS2812B chips, but in recent ...
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2answers
1k views

Why is my RGB LED not working with arduino? [duplicate]

I have an rgb led with a common annode connected to my 3.3v arduino mini pro in the following way: simulate this circuit – Schematic created using CircuitLab When I try to illuminate more than ...
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1answer
249 views

Please review my board design

This is a follow up to my question from yesterday about my schematic Please review my RGB Controller I've fixed the incorrect DC jack component that was present in my previous question, along with ...
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1answer
85 views

Please review my RGB Controller

First off, I just want to say that I'm still pretty new to PCB and schematics design, and electronics in general, so any suggestions on improvement are much appreciated! I'm creating a basic circuit ...
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1answer
2k views

RGB interface with MCU

I am referring 7" LCD (P/N : S070WV20-CT16) for interface with host controller LPC1769. Datasheet Part of datasheet I've added here: TFT has data pins ( R0-R7,G0-G7,B0-B7), Control pins (Mode,DE,...
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1answer
916 views

Use an Arduino to control a 12v rgb strip

I am wishing to use an Arduino UNO to control a 12v RGB LED strip. Can I use a transistor instead of a relay? The LED strip has 4 pins: + , ...
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1answer
975 views

RGB LED Driver (with PWM) not working as expected

I'm working on an RGB LED project for which I have designed a driver (Original Design). Everything seems to be in place but there is some problem that is causing the Drains/Output to be always High ...
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4answers
8k views

Why are the three component LEDs in an RGB LED so unbalanced?

I was recently spec-ing some RGB LEDs for a project, when I noticed that the millicandela ratings on the three colors are rarely close to the same number. (i.e. 710mcd Red, 1250mcd Green, 240mcd Blue)....
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2answers
2k views

How to feed custom RGB Led keyboard backlight

I have found a lot of topics but none of them describe what I want to use it for. Basically I want to put 104 RGB Leds under my laptop's keyboard and be able to control them individually. The ...
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1answer
62 views

Power for Strip lights

How many watts does a 12v 300 led - 5 meter strip light use roughly, is there a wattage per smd/led there 5050, I have a 5amp 12v = 60watts I think and was told that's more than enough, and I have a 1....
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1answer
241 views

A led mystery ? how to connect? [closed]

We have ordered from a supplier some high power leds - 20W RGB. They dont have any data sheet , and so we where thinking that we would try and find quickly how to ...
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1answer
6k views

Can I connect a single color LED string to a RGB DMX512 controller? [closed]

I am planning on doing a bit of a light show this christmas on my house, I have ordered a bunch of 5050 RGB LED Strings, DMX controller, DMX Bridge and will be running the show using Vixen software. ...
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1answer
173 views

tricolor single package LEDs do not have same intensity for each color, why?

LEDs that have 3-in-1 RGB capability where each is driven independantly of the other usually contain three seperate LEDs in a single package. Each of them is made using different material to get ...
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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 ...
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1answer
1k views

How do I measure the output voltage of an RGB LED controller?

I want to replace an RGB LED controller (much like this one) with my own MCU. Therefore, I think I need to know what voltage(s) the RGB LED controller outputs so I can make my MCU/component have the ...
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0answers
482 views

can't change LEDs states using PCA9685

I have a PCA9685 IC connected to i2c of cubieboard like board. Also OE pin is connected to one GPIO pin. I'm using ic2tools to communicate with PCA9685, I can read/...