#include <FastLED.h>

#define LED_PIN     15
#define NUM_LEDS    5

CRGB leds[NUM_LEDS];

void setup() {
  FastLED.addLeds<WS2812, LED_PIN, GRB>(leds, NUM_LEDS);
  FastLED.setBrightness(128);
  FastLED.clear(true);
}

// Helper: blink one LED with a color then turn it off
void blinkLED(int idx, CRGB color, int onMs = 300, int offMs = 150) {
  if (idx < 0 || idx >= NUM_LEDS) return;
  
  leds[idx] = color;
  FastLED.show();
  delay(onMs);

  leds[idx] = CRGB::Black;
  FastLED.show();
  delay(offMs);
}

void loop() {
  // Make sure all LEDs start off
  FastLED.clear();
  FastLED.show();

  for (int i = 0; i < NUM_LEDS; i++) {
    // R -> G -> B for this LED
    blinkLED(i, CRGB::Red);
    blinkLED(i, CRGB::Green);
    blinkLED(i, CRGB::Blue);

    // Ensure it's off before moving on
    leds[i] = CRGB::Black;
    FastLED.show();
    delay(200);
  }
}