#include <Adafruit_NeoPixel.h>

// Define the pin for the NeoPixel data input
#define PIN 6

// Define the number of pixels in the NeoPixel Ring
#define NUMPIXELS 24

// Create an instance of the Adafruit_NeoPixel class
Adafruit_NeoPixel strip = Adafruit_NeoPixel(NUMPIXELS, PIN, NEO_GRB + NEO_KHZ800);

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

void loop() {
  // Run the chaser effect to and fro
  chaserEffect();
}

void chaserEffect() {
  // Define the delay between updates
  int delayTime = 50;

  // Move the chaser from the first pixel to the last
  for (int i = 0; i < NUMPIXELS; i++) {
    strip.setPixelColor(i, Wheel((i * 256 / NUMPIXELS) & 255));
    if (i > 0) {
      strip.setPixelColor(i - 1, 0); // Turn off the previous pixel
    }
    strip.show();
    delay(delayTime);
  }

  // Move the chaser from the last pixel to the first
  for (int i = NUMPIXELS - 1; i >= 0; i--) {
    strip.setPixelColor(i, Wheel((i * 256 / NUMPIXELS) & 255));
    if (i < NUMPIXELS - 1) {
      strip.setPixelColor(i + 1, 0); // Turn off the previous pixel
    }
    strip.show();
    delay(delayTime);
  }
}

// Input a value 0 to 255 to get a color value.
// The colors are a transition r - g - b - back to r.
uint32_t Wheel(byte WheelPos) {
  WheelPos = 255 - WheelPos;
  if (WheelPos < 85) {
    return strip.Color(255 - WheelPos * 3, 0, WheelPos * 3);
  } else if (WheelPos < 170) {
    WheelPos -= 85;
    return strip.Color(0, WheelPos * 3, 255 - WheelPos * 3);
  } else {
    WheelPos -= 170;
    return strip.Color(WheelPos * 3, 255 - WheelPos * 3, 0);
  }
}