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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186 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
117 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
3k 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 ...
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2answers
12k views

How do I calculate what resistors I need for RGB LEDs with 3.7V? [duplicate]

I have a total of 4 x RGB LEDs. I am hoping to power these as well as a RFduino BLE module with a 3.7V lithium rechargeable battery. I was just wondering how I would go about calculating the ...
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1answer
704 views

HDMI to RGB conversion

I am working on a HDMI dongle based on I.MX6Q with reference to the design files shared in Freescale community. I want to feed HDMI input to processor. As there is no HDMI input available with I....
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3answers
873 views

Dimension RGB LED for peak current

I would like to drive a 3x3 RGB LED matrix multiplexed. This means each RGB LED has 1/9 duty cycle and that means it consumes 1/9 of total current. The RGB LED I am using is designed for max 35 mA ...
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3answers
1k views

Powering RGB Leds from 2 AA batteries

For a hobby project I'm trying to power a PIC microcontroller and 4 RGB leds from two AA batteries. I have both the PIC and the circuit shown below being powered by the batteries and the PIC ...
2
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2answers
2k views

RGB LED flickering with PWM

I just have issues with the RGB LED flickering under low duty-cycle like 10% on time with 780 Hz. I tried changing the PWM frequency to lower and higher rate but I still see flickering at low duty-...
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1answer
261 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, ...
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2answers
1k 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
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1answer
1k 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 ...
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3answers
4k 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 ...
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1answer
5k 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 ...
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4answers
236 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 ...
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3answers
418 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 ...
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2answers
3k 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 ...
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2answers
682 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 ...
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1answer
68 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 24-...
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1answer
242 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
414 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
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1answer
142 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 ...
4
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1answer
5k 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 ...
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1answer
1k 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. I'...
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2answers
2k 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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1answer
235 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 ...
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5answers
8k 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.
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3answers
1k 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 don't need control over each color of each bulb) ...
3
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1answer
4k 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
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4answers
20k 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 ...
6
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1answer
2k 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.) ...
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3answers
651 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 (...
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1answer
104 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 ...
9
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2answers
23k 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
2k 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 ...
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3answers
1k 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
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1answer
388 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 ...
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1answer
254 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 ...
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1answer
331 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 ...
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1answer
3k 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 ...
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2answers
2k 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 ...
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1answer
2k 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 ...
3
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1answer
6k 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 ...
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2answers
3k 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 ...
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1answer
1k 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 ...
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3answers
2k 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 3 ...
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2answers
986 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 ...
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5answers
38k 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 ...
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1answer
4k 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 (...
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2answers
817 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 ...
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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 ...