#include <Adafruit_NeoPixel.h>

#define PIN 3
int n=0;
Adafruit_NeoPixel strip = Adafruit_NeoPixel(3, PIN, NEO_GRB + NEO_KHZ800);


void setup() {
  strip.begin();
  strip.show();
}

void loop() {
		strip.setPixelColor(n%3,255,0,0);
    strip.setPixelColor((n+1)%3,0,255,0); 
    strip.setPixelColor((n+2)%3,0,0,255);
    strip.show();
    delay(1000);
    n++;
}