led - milis arduino와 함께 깜박이는 WS2812 fastLED

좀 더 가까이 가나 요?

#include "FastLED.h"
#define NUM_LEDS 12 // number of LEDS in neopixel ring
#define DATA_PIN 10 // for neopixel ring
CRGB leds[NUM_LEDS];
unsigned long period = 2000;        
unsigned long currentMillis = 0;
unsigned long startMillis = 0;
boolean ledOn = false;
void setup() {
FastLED.addLeds<WS2812, DATA_PIN, RGB>(leds, NUM_LEDS);
}
void loop() {
 currentMillis = millis();
  if (currentMillis - startMillis >= period) {
    startMillis = currentMillis;
    ledOn = !ledOn;
    if(ledOn){
      leds[7]=CRGB(255,0,0);
    }
    else {
      leds[7]=CRGB(0,0,0);
    }
    FastLED.show();
  }
}