//this sketch sequentially lights up an array of NeoPixels with randomly generated colours

#include <Adafruit_NeoPixel.h>


// Which pin on the Arduino is connected to the NeoPixels?
#define PIN        D0 // On Trinket or Gemma, suggest changing this to 1

// How many NeoPixels are attached to the Arduino?
#define NUMPIXELS 16 // Popular NeoPixel ring size

// When setting up the NeoPixel library, we tell it how many pixels,
// and which pin to use to send signals. Note that for older NeoPixel
// strips you might need to change the third parameter -- see the
// strandtest example for more information on possible values.
Adafruit_NeoPixel pixels(NUMPIXELS, PIN, NEO_GRB + NEO_KHZ800);

#define DELAYVAL 500 // Time (in milliseconds) to pause between pixels

void setup() {
  // put your setup code here, to run once:
  pixels.begin(); // INITIALIZE NeoPixel strip object (REQUIRED)

}

void loop() {
  // put your main code here, to run repeatedly:
  pixels.clear(); // Set all pixel colors to 'off'

  for(int i=0; i<NUMPIXELS; i++) { // For each pixel...

    // pixels.Color() takes RGB values, from 0,0,0 up to 255,255,255
    // Here we're using a moderately bright green color:

    int r = random(0,128);
    int g = random(0,128);
    int b = random(0,128);
    
    pixels.setPixelColor(i, pixels.Color(r, g, b));

    pixels.show();   // Send the updated pixel colors to the hardware.

    delay(DELAYVAL); // Pause before next pass through loop
  }
}