#include <Adafruit_NeoPixel.h>

// Pin to use to send signals to WS2812B
#define LED_PIN 10

// Number of WS2812B LEDs attached to the Arduino
#define LED_COUNT 16

// Setting up the NeoPixel library
Adafruit_NeoPixel strip(LED_COUNT, LED_PIN, NEO_GRB + NEO_KHZ800);

void setup() {
  strip.begin();           // Initialize NeoPixel object
  strip.setBrightness(150); // Set BRIGHTNESS to about 4% (max = 255)
  strip.show();            // Initialize all pixels to 'off'
}

void loop() {
  rainbow(10);
}

// Rainbow cycle along whole strip. Pass delay time (in ms) between frames.
void rainbow(int wait) {
  // 5 cycles of all colors on wheel
  for(long firstPixelHue = 0; firstPixelHue < 5*65536; firstPixelHue += 256) {
    strip.rainbow(firstPixelHue);
    strip.show(); // Update strip with new contents
    delay(wait);  // Pause for a moment
  }
}