WS2812B RGB Ring

#include <Adafruit_NeoPixel.h>

#define LED_PIN     1      // Pin where NeoPixel strip is connected
#define LED_COUNT   37     // Number of LEDs in strip

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

// Define 5 colors (R, G, B)
uint32_t colors[5];

void setup() {
  strip.begin();
  strip.setBrightness(50); // Brightness (0-255)

  // Prepare the colors
  colors[0] = strip.Color(255,   0,   0); // Red
  colors[1] = strip.Color(0,   255,   0); // Green
  colors[2] = strip.Color(0,     0, 255); // Blue
  colors[3] = strip.Color(255, 255,   0); // Yellow
  colors[4] = strip.Color(255,   0, 255); // Magenta

  strip.show(); // Initialize all pixels to off
}

void loop() {
  for (int i = 0; i < 5; i++) {      // Loop through all 5 colors
    setAllColor(colors[i]);          // Set all LEDs to the current color
    delay(1000);                      // Keep it for 1 second
  }
}

// Function to set all LEDs to one color
void setAllColor(uint32_t color) {
  for (int j = 0; j < LED_COUNT; j++) {
    strip.setPixelColor(j, color);
  }
  strip.show();
}

#include <Adafruit_NeoPixel.h>

#define PIN_WS2812B 7  // The ESP32 pin GPIO16 connected to WS2812B
#define NUM_PIXELS 16   // The number of LEDs (pixels) on WS2812B LED strip

Adafruit_NeoPixel ws2812b(NUM_PIXELS, PIN_WS2812B, NEO_GRB + NEO_KHZ800);

void setup() {
  ws2812b.begin();  // initialize WS2812B strip object (REQUIRED)
}

void loop() {
  ws2812b.clear();  // set all pixel colors to 'off'. It only takes effect if pixels.show() is called

  // turn pixels to green one-by-one with delay between each pixel
  for (int pixel = 0; pixel < NUM_PIXELS; pixel++) {         // for each pixel
    ws2812b.setPixelColor(pixel, ws2812b.Color(0, 255, 0));  // it only takes effect if pixels.show() is called
    ws2812b.show();                                          // update to the WS2812B Led Strip

    delay(500);  // 500ms pause between each pixel
  }

  // turn off all pixels for two seconds
  ws2812b.clear();
  ws2812b.show();  // update to the WS2812B Led Strip
  delay(2000);     // 2 seconds off time

  // turn on all pixels to red at the same time for two seconds
  for (int pixel = 0; pixel < NUM_PIXELS; pixel++) {         // for each pixel
    ws2812b.setPixelColor(pixel, ws2812b.Color(255, 0, 0));  // it only takes effect if pixels.show() is called
  }
  ws2812b.show();  // update to the WS2812B Led Strip
  delay(1000);     // 1 second on time

  // turn off all pixels for one seconds
  ws2812b.clear();
  ws2812b.show();  // update to the WS2812B Led Strip
  delay(1000);     // 1 second off time
}