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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389 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
234 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
2k 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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262 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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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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3answers
2k views

Change RGB leds intensity?

Sorry if this is too basic but I don't understand this issue. Right now, using an MCU, I change the RGB colours of an LED strip with 3 PWM signals. All colours works great . The thing is, when I am ...
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3answers
6k 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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1answer
63 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
1k 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
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
391 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
157 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
2k 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
56 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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24k views

Hooking up multiple RGB LEDs while using a minimal number of PWM pins on an Arduino?

I currently have an anode RGB connected to the 11, 10, & 9 PWM pins on my arduino. However I would like to add 3 more LED's to my project, but I don't want to necessarily take up every single PWM ...
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2answers
2k 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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3answers
204 views

Reference for color sensor [closed]

I am trying to make a colorimeter using TCS3200 sensor and white LED light source. After weeks of research and understanding on how different white light sources work and what are the algorithms ...
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1answer
256 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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1answer
392 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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2answers
416 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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2answers
569 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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2answers
2k views

7-color RGB LED Help

I bought a 3 legged Blinking (I have a theory this might be my problem) RGB LED from Radio Shack. I am not quite sure on how to code my arduino to make it emit one solid color constantly. The closest ...
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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
108 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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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
180 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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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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1answer
136 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
3k views

Raw RGB from CMOS image sensor to grayscale conversion

I am trying to produce an image with OV7740 color image sensor. As far as I know, the sensor is configured by default to provide 10bit parallel RAW RGB data (due to an on-chip Bayer filter). How ...
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2answers
596 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
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
769 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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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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1answer
706 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
700 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
118 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
410 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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1answer
453 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
154 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
283 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
17k 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
644 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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2answers
7k views

How does a PC detect a VGA monitor?

Currently I am trying to connect my LCD to my laptop through a VGA connector. The LCD has 6 wires out of it which I am trying to solder to a VGA male connector, But the laptop doesn't detect the LCD. ...
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0answers
98 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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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
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
725 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 ...