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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PWM RGB LED strip with IRLZ44N

So this is part 3 (or 4 depending how you look at it) in a series of questions I've had around PWMing an RGB LED strip from an ESP8266 (check my question history if you desire). I apparently keep ...
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What could cause intermittent flickering in a RGBIC LED Strip?

I have a 5m RGBIC LED Strip (specifically this one), cut and connected (using this set) with wires of less than 1.5m length in total. Generally everthing seems to be fine. Colour, brightness, segments ...
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Arduino PWM MOSFET LED strip driver

First off, my electronics knowledge is really basic. I learned some at school and very simple projects with Arduino. I'm a scale modeler making a specific diorama with LED lighting. I'm trying to ...
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How to isolate an I2C Bus from its controller for large RGB strip projects?

Last year I controlled my RGB, 5v (not 12v) strips with a Raspberry Pi. The Raspberry Pi was powered separately from the lights via a 5v barrel supply. Everything worked mostly ok. Some erratic ...
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How can front- and backporch in TFT displays be inexact?

Today I had the question as to why front- and backporches in TFT displays can vary. There is this image (from https://www.youtube.com/watch?v=hnzhK5Vvvao) which shows the HSYNC, HBP, Active Width and ...
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Getting AV video from RGB or VGA or HDMI [closed]

Which is the simplest option? In order to get Composite video with NTSC/PAL video we will use a CS5213 to convert HDMI to VGA, then use some resistors to get Composite video with NTSC/PAL. Then I ...
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WS2811 IC Supply Current

There are ten RGB LEDs and ten WS2811 ICs in my circuit. I'm trying to find out how much current the WS2811 IC draws from my 5 V supply. No information about supply current is given in the datasheet. ...
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DotStar micro LED run at 3.3 V

I am designing a Binary Coded Decimal watch which uses DotStar micro LEDs for the watch face and an ATtiny1616 MCU. I want the watch to run off a Li-ion battery, but I am stuck on this circuit since ...
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RGB LED Color Calibration to D65

I am trying to determine resistor values to set the forward current per color of an RGB LED. I would like to achieve approximate D65 (daylight white) when all LED channels are driven at maximum ...
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2 answers
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Inductive load turns on PC mouse RGB

I have a floor fan connected on the same outlet as my PC. When the PC is off, if I turn on or turn off the fan the mouse RGB lights up for a split second. The mouse is plugged in to a USB port that ...
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1 answer
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LED driver resistors

I'm designing a circuit using an LED driver that is intended for RGB LEDs and uses a resistor to set the current for the constant current supply. On the LED datasheet, each color is tested at ...
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ESP 01M LED circuit

I designed a small LED board using an ESP 01M. At first, the 5mm LED was working as I wanted. Sometimes the processor was reset, so I plugged a capacitor into the inputs and outputs of the AMS1117 and ...
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Why does pixel binning remove colors and provide monochrome image only with CMOS color cameras?

Some industrial cameras (astrophotography or microscopy) offer a hardware digital "binning" feature. Indeed, sending uncompressed 10 megapixels x 3 RGB bytes per pixel x 30 frames per second ...
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Using channel A to control the operation of a segmentation module

I need to write a segmentation module in VHDL where a pixel with four channels, R, G, B and A is given as an input. The segmentation is a simple thresholding operation. Since the channel A does not ...
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Driving an RGB LED strip with an ESP8266

simulate this circuit – Schematic created using CircuitLab That's my circuit, although it's an RGB LED strip that I'm driving, rather than three individual LEDs. It works. I can PWM each channel ...
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Building a simple USB notification light

I successfully used an Arduino with the FastLED library to operate my WS2812 Ring Light. For my next project, I want to create a notification light for my PC. Instead of using an arduino, I picked up ...
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1 answer
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RGB LED simulation with Arduino code

In this Arduino code, I want to when press numbers from 0 to 8, my LED s respond to it. Everything is working fine from 1 to 6 and 8. But when I select 7 and my code doesn't run well and Red and Green ...
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Looking for 5mm discrete multi color LED [closed]

I want to make an electronic version of the Master Mind game as a hobby project. The challenge at the moment is to find right type of LEDs for the job. Below you ...
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1 answer
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ST7789 display: pins IM0, IM1, IM2, IM3 are not accesible

In a [ST7789 LCD](https://www.adafruit.com/product/3787, how do I set the IM[3:0] pins for select the MPU Interface Mode? The manual just shows the values of IM[3:0] for each interface but doesn't ...
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RGB LED driver, PWMs seem to interfere with each other

I have inherited a project from colleague that is leaving the company. This project is a RGB LED driver with three LEDs, red green and blue, that uses an Elmos E521.36 chip. Its datasheet is available ...
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WS2812B absolute maximum voltage

The data sheet I have of the WS2812B is found here. I can see that there is a defined operational voltage that puts it below 5.3 V. It doesn't mention an absolute maximum voltage which I am interested ...
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Convert RGB to the composite video / S-video (math)

I used to do it in circuits with CXA1645 or AD725. But this question is not about soldering, it is about math and digital processing. Imagine I am designing the entry-level graphics processor using ...
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1 vote
1 answer
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16 high frequency ~4khz or more pwm ESP8266

I do colorful led light near my table. I have 5 common anode led rgb strips, glued to a different places. I'm trying to develop my own rgb controller based on ESP8266, with WIFI and USB, and met a ...
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Connectors on ARGB strip confuse me

I am looking for a nice ARGB strip for a project of mine. I am quite familiar with the 3 pads concept for ground, data and power, but a lot of the strips that I'm looking into buying have multiple ...
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How to convert composite AV signal or RGB to luma (grayscale)?

As the title says- how can you convert composite signal into luma?? As we all know, composite is just what it says, composite video with grayscale and color signal combined and luma is just grayscale. ...
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1 answer
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Are rgb changes affected by monitor response time?

If I'm not wrong, response time on monitors just has to do with how dark or light the image is. In that case, if a monitor has a dark blue frame followed by a light red frame and response time is 10ms,...
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1 answer
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How data is sent to a raw TFT?

I have used TFT drivers before but now I want to challenge myself by connecting an FPGA to a raw TFT without a driver. I am having hard time understanding the basics of the signals : how RGB pins are ...
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Using an RGB TFT screen on the Raspberry Pi 4

I want to use the HT0700EI02A TFT screen on the Raspberry Pi 4 Compute Module. Raspberry Datasheet: https://datasheets.raspberrypi.org/cm4/cm4-datasheet.pdf Screen Datasheet: https://cdn.ozdisan.com/...
2 votes
1 answer
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When using multiple constant current drivers for High Power RGB LEDs, connect Vo- together? [closed]

I'm using a set of three Mean Well HLG-60A-C350AB in order to drive a string of 48 no-name high power RGB LEDs. I chose these drivers because they provide an easy way to regulate the constant between ...
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1 answer
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SPI PWM LED driver [closed]

I am looking for an integrated circuit that would connect via SPI to a Raspberry Pi (this should not be overly important besides 3,3V input logic and limited clock frequency). Target use is LED strip ...
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1 answer
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I need to find a housing connector for an LED [closed]

I am trying to find a connector for an RGB LED (Mfg P/N: LZ1-10R102-0000). I don't want to solder wires onto the board because I want to gift it to my grandparent for easy assembly and change if LED ...
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2 answers
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Mystery RGB LED ring from defunct Hello Sense device. Trying to make it work

I can't seem to figure out how to get this LED ring to work. It's got 4 labeled pads: GND, VCC, VIN, DO. I tried wiring DO to an Arduino and running FastLed on it but it won't light up. I tried using ...
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LED Lighting Project: Components for RGB controllable system using cree® Xlamp® Xm-l color leds

Experience: Novice, I know not to touch 220v circuits... Objective: LED lighting system for exterior trellis with controllable color, using Cree® Xlamp® Xm-l color leds. Required: What is the ...
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3 answers
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Does a USB port provide enough power for my LED project?

I'm not quite sure whether or not my LEDs will draw too much current. I can't put the schematic right now, but basically I'm using just using the power line from the USB 2.0 port on my board, and it ...
9 votes
3 answers
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My DIY RGB LED panel powered by 9V battery works but certain colors like blue, white, and purple don't work

I am able to power on my LED unit here with a 9V battery. I'm using a recharble lithium 9V as well. I can't figure out why I can't get blue, purple, and white. The only colors I get are red, orange, ...
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How can I at least estimate the optical power that an RGB LED radiates given the typical parameters?

How can I at least estimate the optical power that an RGB LED radiates given the typical parameters - say luminous intensity in Candela or Luminous efficiency - from a data sheet? Assume this is a ...
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1 answer
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RGB LED matrix 64x32 + ESP32 powering

I'm trying to figure out what's the best way to power a 64x32 RGB LED matrix and an ESP32 WROOM 32D using both a power bank (some 18650 2000mAh 3.7V in parallel + voltage regulator) and USB C (5V 3A). ...
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2 answers
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Driving Smart LEDs (integrated IC) at 24V

I need the help of someone more competent at deciphering datasheets of obscure components. I am currently building an LED indoor light installation and would like to have hundreds (400-800) of ...
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How to control 400 RGB LEDs individually?

I've got a little home project that I want to start. I don't have really have any experience in this field. So be gentle. I need control up to 400 RGB LEDs individually. They only need to function in ...
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Small RGB chip identification

I seem to be struggling in locating a replacement set of LEDs for my DRL board. The manufacture is in China and will not help me out The led is an RGB chip but every replacement I have found so far ...
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1 answer
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Which of these is the correct wiring of an RGB light strip with n-channel MOSFET for Arduino

In these 2 examples, they connect the source to the gate with a 10K resistor, and both source and gate are connected to ground (edit clarification: gate connects to ground via 10K resistor - source ...
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1 answer
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Film over an SMD LED to change its colour?

I require an RGB white + amber LED SMD chip. Unfortunately, it looks like nobody really makes such a thing except for one seller on Aliexpress. I tried purchasing a few of these only to find their ...
1 vote
1 answer
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Determine the relative postion of a Chip to another one

For a project I want to have an unspecified amount of modules connected to each other. All of them will be controlled via a Controller. I would like to create a virtual map within the Controller, of ...
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Representing AC sine wave with common anode/cathode RGB LED

I have a AC sine/triangle wave I want to represent with single red/green LED. When positive side goes up then green light increases and opposite for negative/red light. This is pretty simple with two ...
2 votes
1 answer
184 views

Why would an RGB LED still glow with only the cathode side connected?

The Setup I have an RGB LED controller that is mostly a black box to me (I assume it's using PWM to produce color transitions). It's connected to an assortment of common anode RGB LEDs (they're all ...
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Why GRB format for programmable LEDs?

Why manufacturers use GRB(Green, Red, Blue) format for "RGB programmable LEDs" instead classic RGB format? Eg. IN-PI55TAT RGB LED 4 pin From the bottom of Page 6 on the datasheet: Is this ...
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Safe to use series resistors for powering common anode RGB LED from single constant current source?

I have a 3-9W common anode RGB LED (https://cdn-shop.adafruit.com/product-files/2524/FD-9RGB-Y2.pdf) and want to vary each leg's voltage with PWM through FETs, namely IRLZ44Ns, and an Arduino, in a ...
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Routing Guidelines for Analog Video (VGA, RGsB, PAL)

I am currently into the design of the analog video IN/OUT. Basically I have a 3U PCB on which the encoder/decoder ICs are present, that converts the digital video to the analog RGsB (RGsB OUT) and PAL ...
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Resistor on data line between SK6812MINI-E and an MCU

Im getting pretty confused by the resistor that is supposed to be between the DIN of the first SK6812MINI-E and the pin of the MCU. The LEDS are being powered by a 5V 2A power supply (but should only ...
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RGB 24-bit resolution on 12-bit DAC

I am looking to pass my 24-bit RGB color value through a DAC, but my resolution of the DAC is 12-bits. Would I have to reduce the resolution of each channel to fit it on my 12-bit DAC? Is there a way ...
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