#include <FastLED.h> // https://github.com/FastLED/FastLED
#define LEDnum 8     // number of WS2812B
#define LEDpin 4     // data pin
CRGB led[LEDnum];    // FastLED object (led[])
int  i, r, g, b;
unsigned long timer, timeout = 250;
int rv, gv, bv;

void setup() {
  Serial.begin(115200);
  randomSeed(analogRead(A0));
  FastLED.addLeds<WS2812, LEDpin, RGB>(led, LEDnum);  // initialize
  FastLED.clear();                                        // clear buffer
  FastLED.show();                                         // show buffer
}

void loop() {
  if (millis() - timer >= timeout) {
    timer = millis();
    while ((r == 0 && g == 0 && b == 0) || (r == 1 && g == 1 && b == 1)) {
      r = random(2); g = random(2); b = random(2);
    }

    led[i] = CRGB(255 * r, 255 * g, 255 * b); // load WS2812 buffer with random colors
    FastLED.show(); // display WS2812 buffer
    FastLED.clear(); // clear WS2812 buffer
    if (r) rv++;
    if (g) gv++;
    if (b) bv++;
    Serial.print(rv);
    Serial.print(" ");
    Serial.print(gv);
    Serial.print(" ");
    Serial.print(bv);
    Serial.println();
    r = 0; g = 0; b = 0;
    i++;
    if (i == LEDnum)
      i = 0;
  }
}