#include <FastLED.h>
#define WIDTH 36
#define HEIGHT 16
#define LED_PIN 2

const int NUM_LEDS = WIDTH * HEIGHT;
CRGB leds[NUM_LEDS];

void setup() {
  FastLED.addLeds<WS2812B, LED_PIN, GRB>(leds, NUM_LEDS);
}

void loop() {
  for (int i = 0; i < NUM_LEDS; i++){
    leds[i].r = 100;
    FastLED.show();
    leds[i].r = 0;
    delay(10);
  }
}