Multiple FastLED strips, but only one works at a time

Hi all,

I have 3 WS2812B strips with different lengths. I would like to control each of them from separate data pins on the same controller. For now, I’m sending each strip the same animation.

The issue is that only one strip will activate. For example, the code below results in only the LARGE strip lighting up. If I comment out the LARGE animation (in the loop), then the MEDIUM strip will light up.

I’m going nuts debugging, so I’m starting to think that I am missing a fundamental concept here.

#include <FastLED.h>

#define DATA_PIN_SMALL    0
#define DATA_PIN_MEDIUM   1
#define DATA_PIN_LARGE    2

#define NUM_LEDS_SMALL    12
#define NUM_LEDS_MEDIUM   20
#define NUM_LEDS_LARGE    43

#define LED_TYPE    WS2812B
#define COLOR_ORDER GRB

CRGB Small[NUM_LEDS_SMALL];
CRGB Medium[NUM_LEDS_MEDIUM];
CRGB Large[NUM_LEDS_LARGE];

#define BRIGHTNESS          96
#define FRAMES_PER_SECOND  120

void setup() {
  delay(3000);
  
  FastLED.addLeds< LED_TYPE, DATA_PIN_SMALL, COLOR_ORDER >(Small, NUM_LEDS_SMALL).setCorrection(TypicalLEDStrip);
  FastLED.addLeds< LED_TYPE, DATA_PIN_MEDIUM, COLOR_ORDER >(Medium, NUM_LEDS_MEDIUM).setCorrection(TypicalLEDStrip);
  FastLED.addLeds< LED_TYPE, DATA_PIN_LARGE, COLOR_ORDER >(Large, NUM_LEDS_LARGE).setCorrection(TypicalLEDStrip);

  FastLED.setBrightness(BRIGHTNESS);
}


  
void loop() {
  // Animation for Small Strip
  fadeToBlackBy( Small, NUM_LEDS_SMALL, 5);
  int posSmall = beatsin16( 13, 0, NUM_LEDS_SMALL-1 );
  Small[posSmall] += CHSV( 160, 255, 192);
  
  // Animation for Medium Strip
  fadeToBlackBy( Medium, NUM_LEDS_MEDIUM, 5);
  int posMedium = beatsin16( 13, 0, NUM_LEDS_MEDIUM-1 );
  Medium[posMedium] += CHSV( 160, 255, 192);
  
  // Animation for Medium Strip
  fadeToBlackBy( Large, NUM_LEDS_LARGE, 5);
  int posLarge = beatsin16( 13, 0, NUM_LEDS_LARGE-1 );
  Small[posLarge] += CHSV( 160, 255, 192);

  FastLED.show();  

  FastLED.delay(1000/FRAMES_PER_SECOND); 
}

Oh my gosh, I just noticed that typo in the third line of the "Large" animation.

I'll see myself out...