#include <Adafruit_NeoPixel.h>

#define PIN 6 // D6 on Arduino Nano
#define NUM_LEDS 16 // Number of LEDs in Neopixel Ring

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

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

void loop() {
  for (int i = 0; i < NUM_LEDS; i++) {
    strip.setPixelColor(i, 255, 0, 0); // Set the current pixel to red
    strip.show(); // Update the pixel
    delay(40); // Delay to create spinning effect
    strip.setPixelColor(i, 0, 0, 200); // Turn off the current pixel
    strip.show();
    delay(100);
  }
}