I thought this was going to be fairly straight forward. I'm trying to drive four 16x16 LED panels using data two pins from my Arduino Nano Every. Power is being supplied separately. The data pins D2 and D4 are each wired to two of the 16x16 LED panels. I want to see the same animation on all 4 panels.
Modifying some example code I thought all I would need to do would be to define my second LED output (D4) and add a the second controller pointing to D4.
#define LED_PIN_2 2
#define LED_PIN_4 4
FastLED.addLeds<NEOPIXEL, LED_PIN_2>(leds, NUM_LEDS);
FastLED.addLeds<NEOPIXEL, LED_PIN_4>(leds, NUM_LEDS);
The two LED panels connected to pin D2 are working fine but nothing from the panels connected to pin D4.