[Solved] Assistance with "NeoPixels"

thanks for shaking me loose...

#include "application.h"
#include "neopixel.h"

#define PIXEL_COUNT 150

Adafruit_NeoPixel myPixels = Adafruit_NeoPixel(PIXEL_COUNT, D2, WS2812B);

const uint8_t mySegment[] = {117,118,119,120};  //<<<<<<<correct, now
uint32_t arraySize = 0;

void setup()
{
  Particle.variable("myArray", &arraySize, INT);
  arraySize = sizeof(mySegment);
  myPixels.begin();
  myPixels.setBrightness(255);
  myPixels.show();
}

void loop()
{
  breatheUpdate(mySegment, 5, 1, 0);
}

void breatheUpdate(const uint8_t * segment, const uint32_t increment, const uint8_t step, const uint8_t lowLimit)
{
  static uint32_t lastTimeChange = 0;
  static uint8_t direction = 1;
  static uint8_t value = lowLimit;
  if(millis() - lastTimeChange > increment)
  {
    value += (direction * step);
    if (value <= lowLimit || value >= 255)
    {
      direction = direction * -1;
    }
    for(uint8_t i = 0; i < sizeof(segment); i++)
    {
      myPixels.setPixelColor(segment[i], myPixels.Color(value, value, value));
    }
    myPixels.show();
    lastTimeChange += increment;
  }
}

the 'fixed' array length....

const uint8_t mySegment[8] = {10,11,12,13,14};

I didn't notice my error.

yeah, I just tossed that together to pull out the test... Well noted!