#include <Adafruit_NeoPixel.h>

#define LED_PIN 6      // Arduino pin connected to NeoPixel DIN
#define NUM_LEDS 10    // Number of LEDs in the strip

Adafruit_NeoPixel strip(NUM_LEDS, LED_PIN, NEO_GRB + NEO_KHZ800);

void setup() {
  strip.begin();     
  strip.show();       // Initialize all pixels to 'off'
}

void loop() {
  rainbowCycle(10);   // Run a rainbow effect
}

// Function to set individual pixel color
void setColor(int pixel, int red, int green, int blue) {
  strip.setPixelColor(pixel, strip.Color(red, green, blue));
  strip.show();
}

// Rainbow cycle effect
void rainbowCycle(uint8_t wait) {
  uint16_t i, j;
  for(j=0; j<256*5; j++) { // 5 cycles of all colors on wheel
    for(i=0; i<strip.numPixels(); i++) {
      strip.setPixelColor(i, Wheel(((i * 256 / strip.numPixels()) + j) & 255));
    }
    strip.show();
    delay(wait);
  }
}

// Color wheel (used for rainbow)
uint32_t Wheel(byte WheelPos) {
  WheelPos = 255 - WheelPos;
  if(WheelPos < 85) {
    return strip.Color(255 - WheelPos * 3, 0, WheelPos * 3);
  }
  if(WheelPos < 170) {
    WheelPos -= 85;
    return strip.Color(0, WheelPos * 3, 255 - WheelPos * 3);
  }
  WheelPos -= 170;
  return strip.Color(WheelPos * 3, 255 - WheelPos * 3, 0);
}