sub array of FastLed CRBG array.

Other Hardware LEDs and Multiplexing
1

I have a long pixel string that I would like to treat as separate multiple arrays. I have read "multiple array controllers" but still don't understand.

FastLED.addLeds<NEOPIXEL, 4>(leds, NUM_LEDS_PER_STRIP);

What is the code for create a new array call newLeds that starts at pixel 12 and goes for 20 more pixels?

2

From reading that page, I think you are misunderstanding what they are saying.

You need to physically have separate strips.

3

you do not need separate strips.

create arrays of crgb or chsv objects, then fill the main array with those arrays, eg:
(may have some errors, but you get the general idea)

#define NUM_LEDS 100
 CRGB leds[NUM_LEDS];

 

CRGB zone1[zone1Size];
CRGB zone2[zone2Size];
CRGB zone2[zone3Size];
CRGB zone2[zone4Size];

void setup(){
  FastLED.addLeds<NEOPIXEL, 4>(leds, NUM_LEDS);
} 

loop(){

for(i = 0; i < zone1Size; i++){
 leds[i] = zone1[i];
}
for(i = zone1Size; i< zone1Size + zone2Size; i++){
 leds[i] = zone2[i];
}
for(i = zone2Size; i< zone1Size + zone2Size + zone3Size; i++){
 leds[i] = zone4[i];
}
for(i = zone3Size; i<NUM_LEDS; i++){
 leds[i] = zone4[i];
}
}
4

Thanks to all the answered.

The answer was provided by Marc Miller on google+ fast led.

CRGBArray<NUM_LEDS> leds;
CRGBset beginning(leds(1,10)); //set custom ranges
CRGBset middle(leds(11,20));
CRGBset end(leds(21,30));

CRGB colorBeginning(0,0,0); //give names to colors
CRGB colorMiddle(255,0,0);
CRGB colorEnd = CRGB::Black;

Then in the main loop you can do something like:

beginning = colorBeginning;
middle = colorMiddle;
end = colorEnd;
FastLED.show();