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
36 views

Is it feasible to decode an 15 kHz RGB (SCART) signal using a sound card?

Do you know whether it would be feasible to decode an 15 kHz RGB signal (from a video game console) using a sound card ? Providing such input can be captured finely enough by a 192 kHz sound card, ...
1
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0answers
53 views

Standard for right angle SMD LED?

I'm trying to specify a SMD LED which has "right angle" mounting, ie edge mounted, with the light going parallel to the horizontal PCB. I need a RGB version (tri-color). Example. As usual, there ...
0
votes
2answers
112 views

Re-design for common anode instead of common cathode

I have a very simple circuit, and I want to use a tri-color LED to indicate which 1 of 3 outputs is on. I currently have a design that works for a common cathode 4-pin LED. However, I have easier AND ...
0
votes
1answer
109 views

driving 4 RGB LEDs with PWM using MSP430

I have a project in which I must drive 4 RGB LEDs using PWM directly from the MSP430. They are separated in two groups of 2 LEDs (1 PWM connection controls one color element of two LEDs) which means I ...
1
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3answers
181 views

Control RGB LED without microcontroller

I have an RGB LED that I'd like to change from green to red when a circuit is completed. While I know this is very simple with tools like an Arduino, I'd love to not use a microcontroller. Would it ...
1
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1answer
64 views

LEDs flash briefly, but don't stay on [closed]

I've soldered a DC power pigtail to a string of 5V LED lights. When I connect the pigtail to the appropriate power source all of the lights flash very brightly and briefly just as the male end goes ...
2
votes
4answers
192 views

Single transistor instead of RGB screen

In today's screens, each individual pixel is created by the combination of three transistor as Red Green Blue. But, colours are already just different frequency waves. Why aren't pixels made by just ...
0
votes
3answers
130 views

How to transfer from arduino uno to strip board (rgb mood light) [closed]

I am new to circuits and just got a arduino uno. made this simple mood light with it for a project im working on. I used this for a start and just want to know what I need to do to transfer this to ...
2
votes
2answers
326 views

RGB LED brightness levels

Do RGB LEDs have very different brightness levels? I'm running an RGB LED (common cathode) via some TIP120 transistors, controlled from a raspberry Pi. There is a 5v feed from the rPi. Initially I ...
0
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2answers
132 views

Controlling RGB LED (common anode) with Arduino

I have an RGB LED (datasheet here) that I want to control using an Arduino R3 (datasheet here). How can I do this? The LED has a common anode, not a common cathode. However, the arduino's I/O pins can ...
0
votes
1answer
43 views

RGB LED and compatible drivers [duplicate]

I need some help regarding LED chips and compatible drivers. I previously included too little detail and spec's so here it is. I have a 50w RGB chip, voltages are red 16-20, green 24-28, and blue ...
0
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1answer
159 views

RGB LED and which drivers

I previously asked a question regarding 50W RGB multi chips and 50W warm white drivers. Here is the driver, a 50W RGB chip draws much lower amperage and compatible drivers usually max out at 650 ...
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2answers
136 views

Driving RGB LED's on white LED driver?

Hello I have recently bought a driver for 50w white LED, I was wondering if it is possible to power 50W RGB LED chip via this driver? I know white LED has different amperage, my driver is for warm ...
2
votes
1answer
97 views

Problem with circuit and led

I have made a board for Arduino that has an DS1307 and an L298P. The board looks that it is working correctly. I have an RGB LED at pins 31, 33, 35 and I try to make them HIGH but the volts that ...
1
vote
0answers
470 views

RGBHV (VGA) to YPbPr Converter and Waveforms?

Purely for hobby, I am working on an RGBHV (VGA) to YPbPr (Component) converter circuit for old games consoles modified to output RGBHV on a VGA cable. From the game consoles, the RGB signal is taken ...
0
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0answers
160 views

Display controller chip with parallel 24-bit RGB input for video rotation/scaling

I am looking for a display controller chip that has digital video input (parallel 24-bit RGB888) and is capable of scaling and rotating video images to be displayed on a 10" TFT-LCD. I'm streaming ...
4
votes
1answer
357 views

Driving three high power RGB LEDs with PWM, from a 9v battery

I'm building some LED juggling balls. I'm planning to power an Arduino with two AA batteries, and power the LEDs with a 9V battery. I want to drive three of these 3W RGB LEDS in parallel, with PWM. ...
1
vote
2answers
232 views

16 bit RGB to vga converter circuit

Can anyone please suggest a circuit to convert 16 bit TTL (3.3V) RGB signal to a VGA signal. I used a resistor network, it works but I think some active component is necessary for load matching ...
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votes
1answer
100 views

are the m74hc595bl and 74hct93 interchangeable?

Im about to put an RGB fader circuit together and it requires the 74hct93. I have quite a few of the 74hc595's. I thought since they are close in name and both shift registers I would ask. 74hc595 ...
7
votes
3answers
614 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.
0
votes
3answers
254 views

Control many RGBs by color group using transistors instead of using LED Driver ICs

I have 12 RGB LEDs that I need to control as per the following parameters: -The bulb is on or off -Brightness control of each color group (meaning I dont need control over each color of each bulb) ...
3
votes
1answer
165 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 ...
3
votes
4answers
802 views

Voltage regulator too hot to touch [duplicate]

I'm working on an RGB LED project. I'm using this as the power supply: https://www.sparkfun.com/products/114 It uses an LM317 which according to the data sheet can supply up to 1.5A. The LED's I'm ...
2
votes
0answers
189 views

Digital RGB interface EMI filtering

Consider the following system: where: The motherboard contains a LCD controller (SSD1963 from Solomon Systech) and other components (application processor, solenoid drivers, power supplies, etc.) ...
0
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3answers
319 views

Inexpensive programmable RGB LED driver/IC/solution?

My desire is to have a simple setup with a dial device (ideal would be a 3 click dial with 3 distinct settings but an analog dial would also be appropriate) whereby position 1 would display a color ...
1
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1answer
78 views

What value resistors should I use for this LED?

I'm trying to figure out the actual value resistance I need for the RGB LED I bought from here: http://www.adafruit.com/products/314#Description According to most of the online calculators, for the ...
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2answers
728 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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3answers
458 views

coding using Arduino, two 74HC595 and two RGB LED, problems with shifting out database

the whole point of this was to be able to send 8 bits of color code to 2 rgb leds through 2 74hc595 registers. if i can get the default color for each led to be sent out then the next part of code is ...
0
votes
3answers
250 views

RGB LED Diffuser

I have come across different techniques for diffusing colors. I found Fresnel Lens can be use for diffusing RGB led colors.Is it worth using it or not. I have tested transparent plastic and some ...
4
votes
1answer
120 views

RGB and SRGB difference and their use

I am working on a project which include displaying RGB colors. I would like to know what is the difference between RGB and SRGB. Is it possible to have srgb colors in led. As SRGB has been used for ...
1
vote
1answer
91 views

LED holder modification

I'm working on a project where I will be using a bunch of RGB LED's. I bought a quantity of this style of LED holders: https://www.sparkfun.com/products/11147 The way they work is you slide the ...
-1
votes
1answer
158 views

LED RGBW Lighting, Will this Design work?

I've got this schematic for a very small lighting setup for my basement. The goal is to have two fixtures that have red, green, and blue lights that can be controlled with knobs on a Separate ...
0
votes
1answer
622 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 ...
5
votes
2answers
427 views

Small, cheap, and simple driver for 16 RGB LEDs

I am working on a board design that will put 16 RGB LEDs in a circle around a rotary encoder. I want this setup to be simple so that I can run it from any micro with limited software (ie. built in PWM ...
1
vote
1answer
264 views

RGB led each color on at a specific voltage

My set up is a small solar panel(10W) charges battery's in my camper, the old led showing that it was charging no longer works, The old led had epoxy around it with 3 diodes in it as well,being a ...
2
votes
1answer
1k views

how to convert a Sync-on-green to VGA (seperate sync) signal?

I have a computer (VAXstation 3100/M76), that has a sync-on-green output: red --( green + sync --( blue --( I want to attach that to a standard ...
4
votes
2answers
1k views

Fading RGB led with ATtiny2313 timer

I'm trying to make mood lamp with only hardware PWM and interrupts (i. e. main loop should be empty). I'm doing it as a challenge to learn how timers work, not for any practical reason. So far I've ...
6
votes
1answer
283 views

RGB LED - Set intensity on Red and Blue

I've recently purchased SparkFun's starter arduino kit, which comes with a 4-legged RGB LED. If I understand correctly, this RGB LED should be able to access the full range of RGB colors, with 255 ...
1
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3answers
651 views

RGB LED - Fade Between Random Colors

I am trying to generate a random color RGB value -> light up RGB led -> wait for 5 minutes -> generate next random color -> fade from old color to new color. For showing the color on LED I am using ...
0
votes
2answers
324 views

Anode RGB LED Arduino Hookup Confusion

I'm having a really hard time getting this RGB Led working with my arduino. First i'll describe my setup (schematic) , and then i'll show you the code I have. I have 5 volts going into the second pin ...
1
vote
3answers
3k 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 ...
2
votes
1answer
1k views

Choosing between RGB LED types

I am building a POV LED Globe using ~200 RGB LEDs. I have three different types I am looking at and have no experience with: 5mm RGB LEDs - Diffused (example) 5mm Straw Hat RGB LEDs - Water Clear ...
4
votes
2answers
435 views

Powering RGB LED's and using a PWM chip; series or parallel?

I'm working on a hobby project where I will be using an Arduino board and a TLC 5940 to control 5 different groups of RGB LED's. The number of LED's in any particular group will not necessarily match ...
1
vote
1answer
572 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 ...
9
votes
2answers
1k views

Controlling an RGB LED color range from an analog temperature sensor (no Arduino, etc.)

I'd like to combine an analog temperature sensor with an RGB LED so that I get a range of colors based on temperature. Low temperature blue, high temperature red, with color fade between them as the ...
1
vote
2answers
295 views

RGB LED lighting controller

I am after an RGB controller or amp capable of powering 8 x strips of the RGB lights that come on 5 meter reels, which are 36W each. The problem T have is the client has supplied the lights which come ...
3
votes
4answers
285 views

Painting Rainbows

I was painting my 2 year old's daughter's bedroom yesterday, she handed me a paint brush and asked me to paint her a rainbow. I could paint her a rainbow, using paint, but I don't have many colour ...
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2answers
796 views

How to run 25 RGB LEDs by an arduino Duemilanove

I am constructing a 5x5 LED grid that has an RGB LED under a plastic cover, and a piezo sensor that changes the RGB LED to one of 8 colors when pressed. So as far as I can tell I need 75 outputs ...
2
votes
2answers
1k views

ATtiny25 PWM LED driver with brightness control

I'll be building a piece of RGB LED jewelry for my beloved one for the holidays. 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 ...
1
vote
3answers
1k views

Blending RGB LED colors together

Although this question is more of an optics than electronics, it strongly involves LEDs so I think it is a good idea to post it here. I have a simple 3W, RGB LED with a 5deg lens. Everything is ...