Hi everyone, I am new to using Fast LED - I am looking to

Jared_Lichtenberg · September 18, 2018, 7:14pm

Hi everyone,

I am new to using Fast LED - I am looking to produce a static gradient from one color to the other, no movement is necessary - just the gradient needs to display when powered on…

I attempted to explore using the Palette Knife tool, and have also reviewed the “ColorPalette” example sketch that comes with the FastLED library, and where I would replace the code in there with the generated code from Palette Knife, but still unsure where to start.

Does anyone have any suggestions? Only variables is number of LEDs and obviously the RGB values on either end of the strip.

Thanks!
Jared

Andrew_Tuline · September 18, 2018, 7:27pm

Will this do?

github.com

atuline/FastLED-Demos/blob/master/fill_grad/fill_grad.ino

/* fill_grad
 *
 * By: Andrew Tuline
 *
 * Date: August, 2015
 *
 * Here's a simple method to blend between a couple of colours across a strand of LED's.
 *
 * It uses FastLED's:
 *
 * - fill_gradient() function to blend between two colours.
 * - beatsin8() to provide a time based smooth varying input to blend().
 *
 * An issue when using the fill_gradient is which way you want the gradient to sweep around the colour wheel. Options are:
 *
 * FORWARD_HUES: hue always goes clockwise
 * BACKWARD_HUES: hue always goes counter-clockwise
 * SHORTEST_HUES: hue goes whichever way is shortest and is the DEFAULT
 * LONGEST_HUES: hue goes whichever way is longest
 *

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marmil · September 19, 2018, 6:04am

And another example for you.

github.com

marmilicious/FastLED_examples/blob/master/fill_gradient_examples.ino

// There are multiple examples below showing the use of
//   fill_gradient, and fill_gradient_RGB
//
// Un-comment examples one at a time to experiment.
//
// Note1:
//   When filling all the way to the end always use NUM_LEDS-1.
//   (If you don't subtract 1 then it will break things.)
//
// Note2:
//   When using fill_gradient_RGB, do NOT include gradient direction
//   info (FORWARD_HUES, BACKWARD_HUES, SHORTEST_HUES, LONGEST_HUES)
//
// Marc Miller,  Nov 2016
//---------------------------------------------------------------

#include "FastLED.h"
#define LED_TYPE WS2812B
#define DATA_PIN 11
//#define CLOCK_PIN 13

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github.com

marmilicious/FastLED_examples/blob/master/fill_gradient_examples.ino

// There are multiple examples below showing the use of
//   fill_gradient, and fill_gradient_RGB
//
// Un-comment examples one at a time to experiment.
//
// Note1:
//   When filling all the way to the end always use NUM_LEDS-1.
//   (If you don't subtract 1 then it will break things.)
//
// Note2:
//   When using fill_gradient_RGB, do NOT include gradient direction
//   info (FORWARD_HUES, BACKWARD_HUES, SHORTEST_HUES, LONGEST_HUES)
//
// Marc Miller,  Nov 2016
//---------------------------------------------------------------

#include "FastLED.h"
#define LED_TYPE WS2812B
#define DATA_PIN 11
//#define CLOCK_PIN 13

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Jared_Lichtenberg · September 21, 2018, 7:19am

@marmil Marc - your code worked great! So it if I’m trying to have more of a gradient towards the middle of my strip, instead of spead out across the entirety of the strip, how would I add more solid colors to the beginning and end of the code?

Thanks!

marmil · September 21, 2018, 1:56pm

You could use fill grad on a smaller range of pixels (that is in a ways from each end), and then use fill solid to fill in the beginning and end section with appropriate matching colors.

Or

Another thing you could try would be FastLEDs gradient palettes where you can make your own. You can adjust where the tradition points are this way.