// https://wokwi.com/projects/422627222463888385

# include <FastLED.h>

#define NUM_LEDS 31
#define DATA_PIN 7

CRGB leds[NUM_LEDS];

void setup() { 
	Serial.begin(115200);
	Serial.println("resetting");

	FastLED.addLeds<WS2812,DATA_PIN,RGB>(leds,NUM_LEDS);

}

void loop() {
  int halfWay = NUM_LEDS / 2;  // the middle of the strip

  for (int i = 0; i <= halfWay; i++) {
    leds[halfWay + i] = CRGB(190, 0, 254);
    leds[halfWay - i] = CRGB(190, 0, 254);

    FastLED.show();

    leds[halfWay + i] = CRGB(0, 0, 0);
    leds[halfWay - i] = CRGB(0, 0, 0);

    delay(100);
  }
}