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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47 views

High Power RGB Led control

We have got a 20W led ,RGB from a good seller in China. I have a few questions regarding the led (see the attached image) Is there a data sheet to this Leds? something generic ? How can you know ...
2
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2answers
128 views

how to get the RGB value of a color using phototransistor or photodiode?

I'm making a color analyzer which can measure Red, Green, and Blue portions of a color (ex: 128,255,0).I'm not supposed to use pre-made color sensors and need 1% ACCURACY. I used three LEDs - R,B ...
0
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2answers
65 views

Arduino - Controlling 8 RGB LEDs (beginner question)

First time poster here. I have an Arduino Uno project that will require 8 RGB LEDs to be controlled. They will be turned on and off with pushbuttons, cycling through red, then green, then blue, then ...
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1answer
64 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 ...
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1answer
46 views

WS 2811 lights flickering

I'm working on a project involving a bunch of daisy-chained WS2811 lights and I'm noticing significant flickering on the ones at the end (lights #16-30 in a chain of 30). Right now, the circuit is a ...
2
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1answer
55 views

how to measure RBG values of a color using phototransistor

I am developing a circuit which can measure RGB values of a given color. I have used LED to transmit light and reflected light is filtered by 3 R, G, B filter papers. Earlier I used LDR and found that ...
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1answer
95 views

Use 4-pin S-video cable connector on RGB LED?

I'm hoping to make some 4-pin RGB LEDs (R, G, B, GND) easily hot pluggable, so I'm wondering if 4-pin S-video connectors could be used. Now, 2 of the pins on a S-video connector are GND, so would ...
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2answers
93 views

LM317 and PWM grounds

I have a question regarding the LM317 and PWM. My circuit receives +12v and has three grounds (R,G,B) that are PWM. I need to drop the voltage down to 3.2 volts from the 12 volt source. NOTE: I know ...
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2answers
51 views

10 3W RGB LEDs in series control current

I'm having the following schematics connected to a 5V 25A DC power supply. All LEDs are 3W RGB, additional values are. R1: 6.8 ohms 1/2W R2: 4,7 ohms 1/2W R3: 4,7 ohms 1/2W I'm using an Arduino Mini ...
2
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2answers
247 views

LDR + RGB Led = Color sensor. How to calibrate it?

1$ color sensor. My adventures in electronics continue. While talking with a friend about colors, he told me about color sensors. Later then, i remembered about the video where they sort smarties ...
2
votes
2answers
235 views

LED hub purpose?

What is the main purpose of LED hub, is it used only for RGB matrices to connect shift registers for every color or there are some other applications? I'm working with HUB75 and that is the reason ...
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1answer
69 views

Multiple LED's, one controller, diagram included

I want to make sure that my logic is correct and this would work. I'm trying to control 5, 16.4' LED strips of 5050 RGB SMD's at 60 LEDs/m or 300/strip. I want all of them to be ran off the single ...
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1answer
36 views

RGB matrix displays?

I'm working on firmware for LED display composed of Chinese RGB LED matrix modules (1/4 scan, 16x16, RGB). I want to find out how some pictures are displayed in three colors, is there any idea behind ...
0
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1answer
74 views

How does a PC detects 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. ...
0
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1answer
65 views

Can use 17 resistors with 16 rgb led's?

I always see an rgb led ran with 3 resistors, for example a 20ma led on 5v power uses 150ohm's for red due to it's lower voltage but only 100ohms for green and blue. I am running 6 shift registers off ...
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4answers
155 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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0answers
62 views

Splitting Digital RGB Signal Line to multiple LED strips

I am trying to connect multiple strings of WS2812B RGB LEDs to the same signal line (so that they will all behave the same way, display the same colors, etc). The WS2812B is very time sensitive, so I ...
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1answer
111 views

Controlling multiple RGB leds with PWM from a Atmega328P using one transistor per color

I want to be able to control 9 RGB leds, each color from a potentiometer. Each color needs 20mA, so when all the colors are present the leds will need 540mA (9*3=27, 27*20mA=540mA). My RGBs leds are ...
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1answer
51 views

What kind of IR controller is required to drive a 15m LED strip?

I have to light a 15m RGB LED strip but I don't know how many amps the IR controller (sensor) is required to drive. There are three LED strips, each 5 metres, and I need to connect them together ...
-2
votes
1answer
100 views

What circuit is used to power up a 3W LED light

What circuit should I use to power up a 3W common anode RGB LED direct from mains (220V)? I am working on a 3W rgb led which has 3 diodes connected in parallel with their + terminal as common anode. ...
2
votes
1answer
98 views

How to calculate image brightness for use with LED panel

I am using a 64x64 RGB LED matrix for which I'm preparing some content. The existing firmware reads RGB888 video files. I'd like to analyse these files before uploading them, to make sure the overall ...
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2answers
93 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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2answers
134 views

0.5m of RGB LED strip light with micro RGB controller powered by 12v li-ion battery pack?

my questions are all pretty basic but I'm very new to electronics and could really use the help. Ill try and be as specific as possible and would appreciate any advice. Abit about me - Im UK based ...
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1answer
79 views

rgb led current limit

I am working with RGB LED, my question is will it burn up / get damaged I have already chosen resistors proper for each color of R G B to draw 20mA, but running R G and B at same time draws lots of ...
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0answers
141 views

Connecting RGB LED light strip to LP3950 color LED driver

I want create color organ controller for use with 12V-24V RGB LED light strip. The LED light color changes need be synchronized to audio signal with both amplitude (beat) and frequency methods (4 ...
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0answers
50 views

multiple RGB LEDS on minimal pwm pins VS current limitions

the theory explained at Hooking up multiple RGB LEDs while using a minimal number of PWM pins on an Arduino? isn't really working with the arduino current limitations mentioned at ...
0
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1answer
75 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
297 views

powering 12V 5m/16ft 5050 RGB LED Strip with 16V power adapter?

I'm new to the forum found this using google. i have 2 (Two) 5050 RGB 12V LED Strips that are 5M/16ft. It's not as bright as i'd hoped it would be. I double powered one of them with the cheap power ...
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3answers
547 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 ...
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2answers
168 views

Show different colors using RGB LED strip and Arduino

I am a beginner, I am following this post to program RGB LEDs (smd 5050). I want few specific LEDs to glow in specific color while other LEDs are glowing in other color. Need help in doing this. I ...
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2answers
185 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 ...
3
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2answers
336 views

The Transistor Menace - Questions regarding an Arduino rgb LED project

I've been browsing this forum and the internet now for a couple of days and what I thought would be an easy side project turned into a (for me) quite complicated matter. I'm planning to build a mood ...
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1answer
96 views

How a decoded picture is stored in a memory? [closed]

If we decode an image (any format) we will get matrix of pixels. For example consider a picture with resolution 10x10 and colour depth of 16777216. Therefore pixel is represented by 24 (888 RGB) bit ...
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0answers
79 views

RGB Cable Assignments - help

I have a video cable D-Sub 9 pin. Someone know the connector pin assignments to do a RGB 3 bnc cable? Someone can help me? Below, the image of description of the cable
0
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1answer
306 views

RGB LED audio spectrum analyzer - Bandpass or FFT?

I'm about to build a coffee table which has a RGB LED matrix build in it just like in this video. https://www.youtube.com/watch?v=4NJDgvV8RZw I want the matrix to display an audio spectrum that ...
0
votes
1answer
220 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 ...
0
votes
1answer
59 views

Change of RGB LED to cheaper one

Right now I'm reading Raspberry Pi Cookbook and I would like to create the program described in the book. Because I'm beginner and I would like to buy more (cheaper) RGB LEDs at once and also I will ...
0
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1answer
1k views

LED strip segments Parallel vs Serial

I have 5050 RGB LED Strip and an RGB controller (Something like this ...
0
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2answers
452 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 ...
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votes
1answer
109 views

Prototype for 8x8 RGB LED display [closed]

I am planning to build a small, very low-resolution, 8x8 RGB LED display, which would be able to display a video (some kind of colorful visualization, lo-res) or a picture from PC via DVI or HDMI ...
2
votes
1answer
125 views

Can I interchange TIP3055 emitter & collector to avoid needing to insulate the heatsinks?

Using three TIP3055 transistors for RGB LED switching. Collectors are tied to cases. They need to be heat sunk and everything's already mounted and assembled and I don't have time to get rubber ...
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1answer
124 views

What kind of RGB LEDs are these?

I bought these RGB flood lights cause I liked the LEDs I saw in them and I was wondering what kind they are so I can just buy the LEDs and not the whole flood light.
1
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1answer
146 views

Color Changing LED Circuit upon power on

The circuit I plan to make will have 3 RGB LEDs in it and what I would Like is for it to change colour each time it turns on to a random colour. I'm a beginner level so any help will be greatly ...
0
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0answers
176 views

How to power Common Cathode RGB LED

I'm trying to figure out how to power a common cathode RGB LED. The setup I have below does not work. I assumed power would flow to R, G, and B, and there would be a white light; but nothing. Would ...
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2answers
118 views

Messing with rgb leds and have a question

I have some LEDs that I'm wanting to use in a project. I would like to know what's the best resistor I would need to get the most light out of the 3 different colors using a 12v source. I've measured ...
3
votes
3answers
333 views

RGB & Proximity Sensor at about 6 feet

New to this site so hoping it's the right place to ask. I'm trying to prototype something for use in a retail store and an idea a teammate had was using an RGB sensor to detect both ambient color as ...
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0answers
357 views

Mystery while driving a NeoPixel Ring (WS2812) with a GEMMA (ATtiny85)

I am working with an Adafruit GEMMA and NeoPixel Ring 16 LEDs (ATtiny85 and 16 WS2812 leds) and trying to get a program to light the LEDs according to my "pattern" structure below, representing R, G, ...
3
votes
1answer
111 views

RGB led driver maximum current

I am planning to build a device that includes an high power RGB LED (either a lightsaber or a decorative object for the girlfriend - I still have to decide), where high power means about 3x3W. I've ...
0
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1answer
80 views

Most efficient way to convert multiple voltages?

I'm driving a rgb led strip and an arduino from a variable power supply between 12-15 volts. So I'm looking at a buck converter for the 12v led's but I need 5v for the arduino as well. There must be a ...
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1answer
1k views

Arduino project: ultrasonic sensor + 5M 5050 RGB LED strip lights

I'm relatively new to electronics, and as a newbie, I am seeking advice. I'm my current project, I would like to test out the combination of RGB LED strip controlled by one ultrasonic sensor. I am ...