#include <FastLED.h>

#define LEDSNUM 3
#define DATAPIN 5

CRGB leds[LEDSNUM];

void setup()
{
 FastLED.addLeds<NEOPIXEL, DATAPIN> (leds, LEDSNUM);
}

void loop()
{
  for(uint8_t i = 0; i < 3; i++)
  {
    leds[i] = CRGB:: Red;
    FastLED.show();
    delay(1000);
    leds[i] = CRGB:: Black;
    
  }
}