Can you make arrays of CRGB or CHSV colors or do they have to

Stephen_Kramer · April 8, 2018, 1:32am

Can you make arrays of CRGB or CHSV colors or do they have to go in a palette? For example CRGB colors[numColors] .

marmil · April 8, 2018, 5:46am

Yes. That’s basically what I did in this example.

marmilicious/FastLED_examples/blob/master/moving_gradient_example.ino

//***************************************************************
// Moving gradient example
// It will wrap around, and the direction can be reversed.
// This is done a bit different then you might expect as I'm
// filling the gradient once in setup() and saving the colors
// in a seperate CRGB array.  Then coping those into the main
// leds array as needed when moving it around.
//
// Marc Miller, Jan 2016
//***************************************************************

#include "FastLED.h"
#define LED_TYPE LPD8806
#define DATA_PIN 11
#define CLOCK_PIN 13
#define NUM_LEDS 32
#define COLOR_ORDER GRB
#define BRIGHTNESS 255
CRGB leds[NUM_LEDS];

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Ken_White · April 8, 2018, 11:57am

Hi @Stephen_Kramer : Yes, you can. Look at my following sketches which illustrate how to create a CRGB array of colors and use those arrays in functions in the sketch:

gist.github.com

https://gist.github.com/chemdoc77/2994b935d333c0c8cbf68d4d7782f6b3

CD77_Special_Request_Red_White_and_Blue_using_CRGBSet.ino

// special request - fill NeoPixel strip with one third red, one third white and one third blue.
// by Chemdoc77

//This was run on a Teensy 3.6 using the Arduino 1.8.3 and the Teensyduino 1.37


#include "FastLED.h"
#define NUM_LEDS 240
#define Data_Pin 6
#define chipset NEOPIXEL

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See line 21 in the above sketch.

See line 20 in the Chase.h tab of the above sketch.

Both have functions that utilize those arrays.

Sam_Guyer · April 8, 2018, 11:56pm

It is worth noting that 24-bit RGB values are the fundamental way that FastLED represents colors, and it is the native “language” that the strips understand. The palettes are just a convenient way to store a set of colors for quick indexing, rather than having to compute or store large numbers of colors.

Stephen_Kramer · April 11, 2018, 3:34am

Thanks. A related question can you have arrays of defined ‘CRGB leds’ strips for example I have 6 strips of different types controlled from 6 pins should I be able to define CRGB ledStripArray[numStrips][numLeds] = {leds0, leds1…} I thought then I could do ledStripArray[ledStripNumber][ledNumber] = color. I tried but no output.

marmil · April 11, 2018, 5:18am

I’m doing this in one of my programs:

#define NUM_LEDS 35
CRGB leds[4][NUM_LEDS];

FastLED.addLeds<APA102, 7,13,BGR>(leds[0],NUM_LEDS);
FastLED.addLeds<APA102, 7,14,BGR>(leds[1],NUM_LEDS);
FastLED.addLeds<APA102, 11,13,BGR>(leds[2],NUM_LEDS);
FastLED.addLeds<APA102, 11,14,BGR>(leds[3],NUM_LEDS);

And can do something like:
leds[2][11] = CRGB(255,255,255);
to set that particular pixel on that one strip.