Saturday, December 12, 2020

Fastled random color

The FastLED Hue-Saturation-Value color model differs from 'traditional' computer HSV color models in two important respects: first is differences in the numeric range of values used to represent colors everything here is a one-byte value fromand second is in the mapping of hue numbers to colors themselves FastLED defaults to using a richer 'rainbow' color map, instead of the traditional 'spectrum' color mapping.

In 'traditional' computer HSV color models, hue is represented as a number of degrees from Saturation and value are often represented as numbers percentages from But neither "" nor "" is a particularly computer-native number, and there's no strong reason to use 'degrees' to represent hue, nor 'percentages' to represent saturation or value; they're all pretty much arbitrary scales.

Accordingly, to make your code smaller, faster, and more efficient, the FastLED library uses simple one-byte values from for hue, and for saturation, and for value. The performance implications are discussed further below, but suffice it to say that it's faster this way. However, by default FastLED uses a 'rainbow' color map instead of a spectrum. The 'rainbow' color map provides more evenly-spaced color bands, including a band of 'yellow' which is the same width as other colors, and which has an appropriately high inherent brightness.

Traditional 'spectrum' HSV color maps have much narrower bands of yellow, and the yellow can also appear muddy. One of the big design decisions was to represent hue as a number fromrather than from or ; here's a code example of how the FastLED hue range design from makes your animation code faster and more compact, just by keeping 'hue' down to a single full-range one-byte number.

FastLED HSV Colors

If 'hue' were to run fromas with traditional HSV ranges, here's roughly what you'd have to do have a variable that cycles to a new hue each time through your main loop, stepping by an arbitrary amount each time, and wrapping around back to the start.

This code above takes up about 84 bytes of program space, and can execute the "hue calculation" about 75, times per second. Using a hue value ofas shows up in some 'color wheel' HSV functions winds up with similar constraints; you have to keep checking to keep the hue 'in range' from zero to This code, using FastLED's hue range of takes up less than half the program space just 34 bytesand can execute the "hue calculation" about 1.

Of course, there's far more to animation performance than just incrementing one variable. But by keeping the range of 'hue' to a single, one-byte value with the full range of is a design decision we've made that leads to the rest of your animation code becoming more compact, fast, and efficient as well. Skip to content. Numeric range differences: everything here is In 'traditional' computer HSV color models, hue is represented as a number of degrees from These charts show several things about each part of the color map: The bottom grayscale bar is the Radiance of each color: the total amount of light emitted.

The FastLED color maps have extremely uniform radiance across the entire color map, and a correspondingly uniform power consumption across colors. In the Rainbow color map, rendering yellow takes a little bit more power than other colors, but otherwise the power usage and radiance curves are absolutely flat.

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The top grayscale bar is the Luminance Y of each color: Luminance is Radiance weighted by the sensitivity of the human eye to each component of the light, and represents the apparent brightness of each color, more or less. All things being equal, the human eye is most sensitive to green.By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service. The dark mode beta is finally here. Change your preferences any time.

Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information. I'm using a simple code to debug the issue but still not working.

Some leds are red but most are blue. I tried with a Arduino Mega and Arduino Nano no difference. This was already answered in the comments, but, yes, you need to connect the ground from the power supply to the arduino GND pin. I don't recognize that LED strip but it does physically look, from the picture, like it only lets you set colors in blocks of 3. Learn more. Arduino FastLed random behaviour Ask Question. Asked 1 year ago. Active 6 months ago. Viewed times. Arduino is powered with a usb cable from my PC.

No the correct led strip, I have a WS but it's the closest I found Any idea what can be the issue? Marchah Marchah 13 13 bronze badges. The power supply in question doesn't matter if you don't show a schematic of how you've got things wired. Please add a schematic. Active Oldest Votes. Sign up or log in Sign up using Google. Sign up using Facebook.

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Stack Overflow works best with JavaScript enabled.CRGB has three one-byte data members, each representing one of the three red, green, and blue color channels of the color. There is more than one way to access the RGB data; each of these following examples does exactly the same thing:.

You are welcome, and invited, to directly access the underlying memory of this object if that suits your needs. All of the methods on the CRGB class expect this, and will continue to operate normally. The CRGB object "is trivially copyable", meaning that it can be copied from one place in memory to another and still function normally.

In addition to simply providing data storage for the RGB colors of each LED pixel, the CRGB class also provides several useful methods color-manipulation, some of which are implemented in assembly language for speed and compactness.

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CRGB colors can be set by assigning values to the individual red, green, and blue channels. In addition, CRGB colors can be set a number of other ways which are often more convenient and compact. The two pieces of code below perform the exact same function.

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Some performance-minded programmers may be concerned that using the 'high level', 'object-oriented' code in the second example comes with a penalty in speed or code size. However, this is simply not the case; the examples above generate literally identical machine code, taking up exactly the same amount of program memory, and executing in exactly the same amount of time.

Given that, the choice of which way to write the code, then, is entirely a matter of personal taste and style.

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All other things being equal, the simpler, higher-level, more object-oriented code is generally recommended. Again, for the performance-minded programmer, it's worth noting that all of the examples above compile down into exactly the same number of machine instructions.

Choose the method that makes your code the simplest, most clear, and easiest to read and modify. If you are copying a large number of colors from one part of an array to another, the standard library function memmove can be used to perform a bulk transfer; the CRGB object "is trivially copyable". By mixing different amounts of red, green, and blue, thousands or millions of resultant colors can be displayed. However, working with raw RGB values in your code can be awkward in some cases.

For example, it is difficult to work express different tints and shades of a single color using just RGB values, and it can be particular daunting to describe a 'color wash' in RGB that cycles around a rainbow of hues while keeping a constant brightness. To simplify working with color in these ways, the library provides access to an alternate color model based on three different axes: Hue, Saturation, and Value or 'Brightness'. In the library, the "hue" angle is represented as a one-byte value ranging from It runs from red to orange, to yellow, to green, to aqua, to blue, to purple, to pink, and back to red.

Here are the eight cardinal points of the hue cycle in the library, and their corresponding hue angle. Click here for full-size chart.

Often in other HSV color spaces, hue is represented as an angle from degrees. But for compactness, efficiency, and speed, this library represents hue as a single-byte number from The CHSV object has the three one-byte data members that you might expect:.

Many of these are automatic and require no explicit code.By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service. The dark mode beta is finally here. Change your preferences any time.

Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information. I want to have a loop that does every iteration and displays every possible colour, to end up with.

But as it was mentioned in the comments, this will take a long time to display all the 16 million colors not to mention that the leds can be unable to display all these colors, so you will probably want something like this:.

And you code will look like this:. One of the possible implementations you can find here. Unfortunately, I can't test it, but I think it should work without problems.

And of course you can optimize it as you want. Learn more. Ask Question. Asked 7 years, 9 months ago. Active 2 years, 6 months ago. Viewed 6k times. Do you need a hex string or an int value? You're going to spend a long time looking at the leds.

fastled random color

That's more than 16 million different colors. If you look at each colour for one second, and continue to do so 8 hours a day, 5 days a week, it will take you about 27 months to see all the colours.

Jul 10 '12 at Active Oldest Votes.To the right are raw WSB modules front and back. When having modules per meter, there is almost no space left between the modules. Wiring up a basic setup is very easy, as the LED pixel strip has only three input pins which must be connected. The color of the inputs might differ among manufacturers.

Therefore, have a look at the description or datasheet of the LED pixel strip that you bought. For this reason, we can connect the GND pin and the 5V pin directly to the white and red wire, correspondingly. Basically, you can use any pin that supports PWM signals. At the beginning, the FastLED header file is included. In the setup function, the LED strip representation is initialized. Optionally, a color correction can be set in order to improve the fidelity of the colors.

Each light program is implemented as a function. In this light program, each pixel has a randomly selected color. In the loop function, each light program is called twice with different parameters. When the source code is compiled and transferred to the Arduino, the LED strip should show colored pixels according the active light program.

LED pixel strip controlled by an Arduino Uno. Your email address will not be published. Save my name, email, and website in this browser for the next time I comment. This site uses Akismet to reduce spam. Learn how your comment data is processed. Leave a Reply Cancel reply Your email address will not be published.High level controller interface for FastLED.

Definition at line of file FastLED.

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There are two ways to call this method as well as the other addLeds variations. The first is with 3 arguments, in which case the arguments are the controller, a pointer to led data, and the number of leds used by this controller.

The second is with 4 arguments, in which case the first two arguments are the same, the third argument is an offset into the CRGB data where this controller's CRGB data begins, and the fourth argument is the number of leds for this controller object.

Definition at line 30 of file FastLED. The first is with 2 arguments, in which case the arguments are a pointer to led data, and the number of leds used by this controller. The second is with 3 arguments, in which case the first argument is the same, the second argument is an offset into the CRGB data where this controller's CRGB data begins, and the third argument is the number of leds for this controller object.

This method also takes a 1 to 5 template parameters for identifying the specific chipset, data and clock pins, RGB ordering, and SPI data rate. This method also takes a 2 to 3 template parameters for identifying the specific chipset, data pin, and rgb ordering RGB ordering, and SPI data rate.

This method also takes a 1 to 2 template parameters for identifying the specific chipset and rgb ordering RGB ordering, and SPI data rate. This method also takes a 2 to 3 template parameters for identifying the specific chipset and rgb ordering RGB ordering, and SPI data rate.

Definition at line 63 of file FastLED. Provided to allow the library to be used on platforms that don't have a delay function to allow code to be more portable. Note: this will call show constantly to drive the dithering engine and will call show at least once. Definition at line 73 of file FastLED. Sets the color correction for all added led strips, overriding whatever previous color correction those controllers may have had.

fastled random color

Sets the dithering mode for all added led strips, overriding whatever previous dithering option those controllers may have had. This is global for all leds. Attempts to call show faster than this rate will simply wait. Note that the refresh rate defaults to the slowest refresh rate of all the leds added through addLeds.

Sets the color temperature for all added led strips, overriding whatever previous color temperature those controllers may have had. Definition at line 42 of file FastLED.Welcome to the Tweaking4All community forums! Topics for particular software or systems: Start your topic link with the name of the application or system. Below, for practical testing reasons, squeezed into 10 minutes with the sunrise part only. The total duration is divided into intervals, so the strip updates every 2.

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Later, the update intervals will lengthen, with the sunrise duration stretched over 3 hours. So far, so good. But for good realism, I need to introduce the effect of light passing through long grass, shrubs, foliage or clouds. In other words, while with every interval all LEDs of the strip receive new colour values from the active palette in skyEffect and then the result is displayed with FastLED. Maybe you or any of the resident effect wizards has an idea how that shimmering effect can be "overlaid"?

I'm having a hard time understanding exactly what you're looking for, but maybe I need some more coffee first just woke up haha. So you're looking to apply a color pattern, which you want to slowly increase in brightness? Possibly combined with some randomness? Apply palette do not use "Show" yet and before using "show" apply a nscale "darkening" per LED wikifor example. I need coffee to get me through this quest, which on paper sounds so very simple and straightforward.

fastled random color

You could upload the code above, which works wellto see what actually happens a 10 minute version of what later will take 3 hours and of course maybe change the 10 minute value to only 2 minutes to not fall asleep :. What the above does is lighting an entire LED strip with colours fetched from a self-made palette later, there will be three palettes - sunrise, daytime, sunset or paletteknife palette it is quite simple to create one's own palettes rather than using the built-in "disco palettes".

What you suggest makes sense trying nscale8 and I try it out today, if I find the time; I realised that fadeToBlackBy is not right for what I'm after, because that turns off LEDs fully. I see I'm not alone when it comes to the need for coffee. I'd love to give it a try, but I recently moved and all my Arduino gear is still boxed up haha.

So testing is a challenge here. The entire strip is fully lit via the palette at all times, as shown in the first code example that works. The shimmer effect should then simply modulate that illumination by way of random brightness changes of random LEDs concurrently. It's really that simple on paper. But the FastLED documentation is not very thorough for each basic function and most examples I found online are nearly the same, packed full of bouncy disco effects where one user just seemingly copied from another or modifies things to their liking.

But there is no from-the-ground-up explanation online that goes from the basics upwards - addressing LEDs, addressing LEDs randomly, addressing LEDs from external inputs What I mean is that most examples are extremely convoluted so it is hard to dissect them for essential information, for the "FastLED building blocks", so to speak.

Now the first thing that would worry me, is that we never wil be sure all LEDs are dimmed. So for that purpose we can do an attempt to see if a LED has gone below a certain value. We keep this assumption until we find that a max value of each color component red, green, blue that exceeds For this I used the " max " function twice.

Once to determine the max value of green and blue Max allows only 2 parameters in "max leds. The return value of that gets plugged in a second call "max leds. The result is then returned. I glued that in a " do The problem with this is that we may run for ever, in case the random function keeps skipping a particular number. So we need to fine tune that. Here we pick a random led, and check if it's dimmed enough.

This is just a start of course.


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