Quick reference example of actuating a WS2812B 8x8 Led matrix with FastLed.h

matrix.ino

#include <FastLED.h>

#define NUM_LEDS 64
#define DATA_PIN 0

CRGB leds[NUM_LEDS];
int set = 0;


void setup() {
    FastLED.addLeds<WS2812B, DATA_PIN, GRB>(leds, NUM_LEDS);
    FastLED.setBrightness(20);
    FastLED.showColor(CRGB::Black);
}

void loop() {
    switch (set) {
    case 0:
        FastLED.showColor(CRGB::Black);
        break;
    case 1:
        FastLED.showColor(CRGB::Blue);
        break;
    case 2:
        FastLED.showColor(CRGB::Aquamarine);
        break;
    case 3:
        FastLED.showColor(CRGB::Green);
        break;
    case 4:
        FastLED.showColor(CRGB::Orange);
        break;
    case 5:
        FastLED.showColor(CRGB::Yellow);
        break;
    case 6:
        FastLED.showColor(CRGB::Red);
        set = 0;
        break;
    default:
        FastLED.showColor(CRGB::Black);
        set = 0;
        break;
    }
    set++;
    delay(5000);
}