#include <Adafruit_NeoPixel.h>

#define numPixels 7

Adafruit_NeoPixel loading(numPixels, 21);

uint8_t rainbowColors[][3] = {
        {255, 0, 0},    
        {255, 127, 0},   
        {255, 255, 0},   
        {0, 255, 0},     
        {30,144,255},     
        {0, 0, 255},    
        {148, 0, 211}    
    };

void setup() {
  loading.begin();

}

void loop() {
  for(uint8_t i = 0; i<7; i++){
    loading.setPixelColor(i,rainbowColors[i][0],rainbowColors[i][1],rainbowColors[i][2]);
    loading.show();
    delay(500);
    loading.clear();
  }

}