purple fade

#include <Adafruit_NeoPixel.h>

#define PIN 6
#define NUMLEDS 60
#define BRIGHTNESS 25 // 0-255 max brightness 'number of steps'
#define COLOR 255, 0, 175 // rgb value
#define DELAY 75 // in milliseconds between 'steps'

// Parameter 1 = number of pixels in strip
// Parameter 2 = Arduino pin number (most are valid)
// Parameter 3 = pixel type flags, add together as needed:
//   NEO_KHZ800  800 KHz bitstream (most NeoPixel products w/WS2812 LEDs)
//   NEO_KHZ400  400 KHz (classic 'v1' (not v2) FLORA pixels, WS2811 drivers)
//   NEO_GRB     Pixels are wired for GRB bitstream (most NeoPixel products)
//   NEO_RGB     Pixels are wired for RGB bitstream (v1 FLORA pixels, not v2)
Adafruit_NeoPixel strip = Adafruit_NeoPixel(NUMLEDS, PIN, NEO_GRB + NEO_KHZ800);

boolean flag;

void setup() {
  // put your setup code here, to run once:

  strip.begin();
  strip.show(); // Initialize all pixels to 'off'
  strip.setBrightness(BRIGHTNESS);
  strip.fill(strip.Color(COLOR), 0, NUMLEDS);
}


void loop() {

  strip.fill(strip.Color(COLOR), 0, NUMLEDS);

  if (flag){
    brighten();
  }
  else{
    darken();
  }

  if (strip.getBrightness() == 0 || strip.getBrightness() >= BRIGHTNESS)
    flag = !flag;

  strip.show();
  delay(DELAY); // adjust time between brightness steps
}


// brighten strip
void brighten() {
  strip.setBrightness(strip.getBrightness() + 1);
}

// darken strip
void darken() {
  strip.setBrightness(strip.getBrightness() - 1);
}