Questions tagged [colour]

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80 views

Wiring colour code/law on universal power supply

Is it legal to use brown and blue for live and neutral wires in equipment sold in the USA, which uses 110v? I was looking at a teardown of an ATX power supply and one of the photos (see below) showed ...
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0answers
90 views

Value of Green as Multiplier for an Inductor Color code

I was going through the Internet searching for the Color code table for an Inductor. The more or less same table which I got is : I have got an inductor : So I cannot find out the Value of this ...
5
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1answer
371 views

What impact, if any, does the solder mask color have on the electrical and mechanical properties of a PCB

At my place of work, we use soldermask colors as a sort of poke-yoke for manufacturing purposes E.g. Technicians know that green pcb goes with green, blue pcb with blue, etc. This has lead to some ... ...
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1answer
111 views

Do purple LEDs mix blue and red, or do they emit true violet?

Do the rare "violet" LEDs emit true violet (400-420nm) light, or do they mix blue and red (440nm and 700nm) light?
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2answers
2k views

What are wavelengths of RGB diodes?

Disclaimer: I am not an electrical engineer, and nowhere near studying it either. This is just a curious question which I got and couldn't find an answer to. I am aware of how several pixels are used ...
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3answers
1k views

How to compare brightness of different color LEDs (not RGB)?

I wonder - let's assume one would build some user interface using green, yellow and red or just any other available colored LED (not RGB LED) - what would be the proper (aka best) way to compare the ...
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3answers
182 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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4answers
45k views

Which color should be soldered to which connector for an earphone jack [closed]

I have an earphone plug having four colored wires (gold, red, green, blue) and a jack with four connectors: I need to know which colour should be soldered to which connector.
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1answer
2k views

How to estimate green or yellow based on the output of RCCC CMOS image sensor

RCCC is a kind of color filter array with one Red filter and three Clear filters, which means it only outputs red color or monochrome signal (Interfacing Red/Clear Sensors ) I know that some RCCC ...
2
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2answers
241 views

Using multiple white LEDs to obtain a unique CCT

I need to swipe between two white shades from one to another color temperature, let's say from 2700K to 6000K. Can it be done by simply mixing the intensities of two LEDs of respectively 2700 and ...
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0answers
384 views

PIC18 Reading from TCS34725 Colour Sensor

I am trying to read from my TCS34725 Colour Sensor (datasheet) however I am not having much luck actually getting data back. When I make my call to read from the sensor, the values that I am getting ...
1
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1answer
672 views

Bi-color LED Intensity + Color Control

Full transparency, I'm a cinematographer, not an engineer, so forgive my ignorance here! I'm attempting to make an inline dimmer for small bi-color LED strips and fixtures. I have larger, more ...
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0answers
75 views

How could I interpret these-2 YUV modulated picture given in wikipedia? is it correct simulation? or something I'm missing?

While reading the wikipedia article on YUV color modulation (which is used in PAL color tv receivers); I visited this diagram: (Wikimedia); (and according to the image description there; i.e. "...
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1answer
394 views

How can I use 5 LEDs for additive colour mixing using the CIE 1931 Chromaticity diagram?

I am using Amber, Green, Blue, White (2500K - Colour Temperature) and White (6500K - Colour Temperature) LEDs, and altering their brightness to get to a specific colour and brightness (luminous flux) ...
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3answers
160 views

What is the correct way to read color codes? [duplicate]

For example, The resistor above has four colors. Green, blue, red, gold. My calculation says its value is 562 ohms +-10%. But this page says its value is 5.6K-1/4W. What is my mistake?
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1answer
124 views

cheapo CCFL LCD keeps colour-drifting - what is the cause? [closed]

My display's (Phillips 231E) white point drifts continiously. Once I have created profile for it it will be fine for some time but then it will shift slightly or badly. For example: in some cases I ...
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2answers
749 views

Color-coded 50 Ohm BNCs

I would like to use some color coding in our experimental rig (microscope). All BNC cables so far are black 50 Ohm, and I'd like to use some yellow, red or any other very-not-black colors. I can't ...
2
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1answer
577 views

Detect the colour of an LED (Red Blue or Green)

I am trying to find a way of determining the colour of an LED without an electrical connection to it, i.e a sensor pointed at the LED. I can place the sensor quite close to the RGB LED I intend to ...
2
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2answers
3k 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 &...
3
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1answer
1k 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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3answers
423 views

Colour Sensor from discrete components?

I am participating in a robotics competition that requires colour detection using discrete components. The aim is to detect red and green lights of traffic signals. I have tried making a sensor ...
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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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1answer
1k views

How to change colour of a 7-segment display using the Arduino [closed]

Is it possible to change colour of a 7-segment display using an Arduino Uno?
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1answer
98 views

LED-colour for clock [closed]

I'm making a big led-clock, and I'll use 55 LEDs per each Segment. The clock will be 15cm high and consits of 4 Segments. That are approx. 250LEDs. Now I'm looking for cheap LEDs which suit my ...
2
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1answer
938 views

How can PAL (TV) encode 3 colors in 1 phase?

As I understand it luminance is the amplitude of the signal, and color is the phase. You need 2 color signals (the third one can be derived from the other 2, like B = 1 - R - G). How can 1 phase ...
7
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4answers
9k views

Specific color sensing, is it possible in an economical way, without using camera/image recognition?

While I understand that color sensing with camera and sufficiently powered processor running image histogram logic (or other such algorithms) can determine presence of certain colours fairly reliably. ...
5
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2answers
5k views

Can a computer monitor output light invisible to the human eye?

From what I understand a computer monitor can output lots (couldn't think of a better word) of colours. Is it possible for a computer monitor (television etc) to output light invisible to the human ...
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1answer
6k views

Distance range of a Color Sensor?

I would like to know what is the usual range of a color sensor ? Can it detect a light source from a few meters away ? for example, if I want to use a color sensor to detect a particular LED 1 meter ...
11
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3answers
13k views

What do the colors of resistor bodies mean?

I don't mean the colored bands, but the colors of the bodies themselves. They come in brown, blue, green, etc. Is there a standard? For instance, epanorama says: But there are two resistor body ...
3
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1answer
226 views

Colour correcting RGB LEDs - possibly with science

I have some RGB LEDs (eBay - no datasheet, 4 pin, common cathode, 5mm). I am colourblind. I'd like to create a palette of colours which appear distinctly for most people's eyes, perhaps 16 colours or ...
8
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2answers
189 views

LED changing colour over time

Can a LED change colour over time? I've had a blue LED set up for some time and it use to be a much brighter (ultramarine blue) now it's heading to a more greenish dull colour. How is this happening?...