Hello, looking for information on where I should be researching for my answer.

Stefin_T · May 4, 2018, 4:43am

If I have a LED strip of 100 LEDs and want the sketch to start at 1-10, then go to 11-20 as 1-10 starts over. Example: A sketch where lights fade from red to orange to yellow. 1-10 starts off at red, then 11-20 start off at red while 1-10 fade to orange. Basically, the sketch transitions down the strip in defined “chunks” (in this case, chunks of 10 LEDs). Looking in documentation on where I should be researching. Thanks for any help.

marmil · May 4, 2018, 5:13am

Check out gradient palettes.

And also FastLED waves.

Gibbedy_G · May 5, 2018, 6:39am

If I’m understanding the question your algorithm is:
1.Copy the first 10 leds to the last 10 leds
2. Fill your first 10 leds.

I don’t think I’m adding anything here. Just thinking out loud.

marmil · May 5, 2018, 7:06am

@Stefin_T Can you clarify if pixels 1-10 is a solid color (all the same color, but slowly transitioning), or if it’s a gradient (color changes from pixel 1 to 10)? I originally might have misunderstood.

If solid blocks of colors, these might give you some ideas to mess with. Code should be able to be modified to do the transitioning over time.

github.com

marmilicious/FastLED_examples/blob/master/repeating_block_pattern.ino

//***************************************************************
//  Basic example that repeats colored blocks of random size down
//  the strip.  The block size is changed every several seconds.
//
//  Important to note is there is a check to make sure we don't
//  try to write data to pixels that don't exist (ie. values
//  equal or greater then NUM_LEDS).  Trying to write pixel
//  data to pixels that don't exist the causes bad things to
//  happen in memory.
//
//  Marc Miller, July 2017
//               May 2020 - replaced delays with EVERY_N
//***************************************************************


#include "FastLED.h"
#define DATA_PIN    11
#define CLOCK_PIN   13
#define LED_TYPE    LPD8806
#define COLOR_ORDER GRB

This file has been truncated. show original

and

github.com

marmilicious/FastLED_examples/blob/master/moving_colored_bars.ino

//***************************************************************
// Moving colored bars
// Original code by Richard Bailey,  Feb. 2017
//
// Modified to allow a few other options (which might be
// useful for Christmas!)
// You'll probably need to adjust stuff for longer strips.  I only
// tested with a tiny 32 pixel setup.
//
// Marc Miller, Dec 2017
//***************************************************************

#include "FastLED.h"
#define DATA_PIN    11
#define CLK_PIN     13
#define LED_TYPE    LPD8806
#define COLOR_ORDER GRB
#define NUM_LEDS    32
#define BRIGHTNESS  64
CRGBArray<NUM_LEDS> leds;

This file has been truncated. show original

Stefin_T · May 7, 2018, 7:14am

Marc, thanks for the reply. The “blocks” of color are a single color and transition from block to block. The code you posted might give me a good direction, I will tinker with it when I get back home.

Stefin_T · May 11, 2018, 4:11pm

@marmil , thanks for the code example…I really like defining the color block length.

What I am trying to figure out is… having a sketch, such as “FadingRainbow” and have the gradient transitions happen across a defined “bar length”. Instead of the gradient happening continously along the strip, I can define that I want the same gradient to happen in chunks of LEDs.

Thanks again, trying to find out where I should be looking in the documentation… I didn’t see anything yet.

marmil · May 11, 2018, 4:25pm

If you’re using fill_rainbow there’s some info in this post that might give you some ideas about how to start the rainbow on a specific hue and transition at a specific rate or over a certain distance: https://plus.google.com/100542328320334100166/posts/Y5BdWFEvfo1

https://plus.google.com/100542328320334100166/posts/Y5BdWFEvfo1

Stefin_T · May 11, 2018, 5:35pm

@marmil thanks Marc, I’ll spend some time looking that over. Looking at the video, it looks close to what I am trying to figure out… with one exception. Instead of multiple strips displaying at the same time, I’d like each strip to act sequential to each other. Thanks again, I appreciate it