FastLED rainbow

#include <FastLED.h>

#define NUM_LEDS 30     // Number of LEDs in your strip
#define DATA_PIN 6      // Data pin connected to your LED strip
#define LED_TYPE WS2813 // Type of LED strip (e.g., WS2812B, NeoPixel)
#define BRIGHTNESS 255  // Global brightness (0-255)
#define SATURATION 255  // Global saturation (0-255)

CRGB leds[NUM_LEDS]; // Array to store LED colors

void setup() {
  FastLED.addLeds<LED_TYPE, DATA_PIN>(leds, NUM_LEDS);
  FastLED.setBrightness(BRIGHTNESS);
}

void loop() {
  // Create a moving rainbow effect
  for (int j = 0; j < 255; j++) { // Loop through hues
    for (int i = 0; i < NUM_LEDS; i++) {
      // Assign a hue based on LED position and the current 'j' value
      leds[i] = CHSV(i * (255 / NUM_LEDS) + j, SATURATION, BRIGHTNESS);
    }
    FastLED.show(); // Update the LED strip
    delay(25);      // Control animation speed
  }
}