// 9 March 2022
// For: https://forum.arduino.cc/t/multiple-led-neopixel/967303

#include <Adafruit_NeoPixel.h>

const int ledPins[9] = { 2, 3, 4, 5, 6, 7, 8, 9, 10};

#define PIN 11         // input pin Neopixel is attached to
#define NUMPIXELS  3   // number of neopixels in strip
Adafruit_NeoPixel pixels = Adafruit_NeoPixel(NUMPIXELS, PIN, NEO_GRB + NEO_KHZ800);

int delayval = 100; // timing delay in milliseconds

void setup() 
{
  // ---------------------------------
  // Nine white leds
  // ---------------------------------
  for( int i=0; i<9; i++)
  {
    pinMode( ledPins[i], OUTPUT);
  }

  // ---------------------------------
  // Three Neopixel leds
  // ---------------------------------
  pixels.begin();
}

void loop() 
{
  // ---------------------------------
  // Nine white leds
  // ---------------------------------
  for( int i=0; i<9; i++)
  {
    digitalWrite( ledPins[i], HIGH);      // turn led on
    delay( 150);
  }

  // ---------------------------------
  // Three Neopixel leds
  // ---------------------------------

  for( int j=0; j<20; j++)        // a number of times a random color
  {
    for (int i=0; i < NUMPIXELS; i++) 
    {
      int redColor   = random( 0, 256);
      int greenColor = random( 0, 256);
      int blueColor  = random( 0, 256);

      // pixels.Color takes RGB values, from 0,0,0 up to 255,255,255
      pixels.setPixelColor(i, pixels.Color(redColor, greenColor, blueColor));

      // This sends the updated pixel color to the hardware.
      pixels.show();

      // Delay for a period of time (in milliseconds).
      delay(delayval);
    }
  }
 

  // ---------------------------------
  // Nine white leds
  // ---------------------------------
  for( int i=8; i>=0; i--)
  {
    digitalWrite( ledPins[i], LOW);      // turn led off
    delay( 150);
  }

  delay( 500);
}