#include <FastLED.h>
#define LEDPIN 7
#define NUMOFLEDS 10
CRGB leds[NUMOFLEDS];
void setup() {
FastLED.addLeds<WS2812, LEDPIN, GRB>(leds, NUMOFLEDS);
}
void loop() {
for (int i = 0; i <= 9; i++) {
leds[i] = CRGB ( 0, 0, 255);
FastLED.show();
delay(40);
}
for (int i = 9; i >= 0; i--) {
leds[i] = CRGB ( 255, 0, 0);
FastLED.show();
delay(40);
}
}