#include <FastLED.h>

#define LED_PIN     1   // Pin to which the LED strip is connected (change as needed)
#define NUM_LEDS    20  // Number of LEDs in your strip (change as needed)
#define BRIGHTNESS  150  // Set the brightness of the LEDs (0-255)

// Define your custom colors here (add or remove as needed)
CRGB colors[] = {
  CRGB(25, 200, 200),
  CRGB(25, 100, 200),
  CRGB(100, 10, 30),
  CRGB(250,165,0)
};

// Calculate the number of colors in the array
#define NUM_COLORS (sizeof(colors) / sizeof(colors[0]))

// Declare the LED array
CRGB leds[NUM_LEDS];

void setup() {
  FastLED.addLeds<WS2812B, LED_PIN, GRB>(leds, NUM_LEDS);
  FastLED.setBrightness(BRIGHTNESS);
}

void loop() {
  // Change the delay value to adjust the speed of the gradient
  gradientEffect(50);
}

void gradientEffect(int delayTime) {
  static int colorIndex = 0;

  // Calculate the indices of the current and next colors
  int currentColorIndex = colorIndex % NUM_COLORS;
  int nextColorIndex = (colorIndex + 1) % NUM_COLORS;

  // Linear interpolation between the current and next colors
  for (int i = 0; i <= 255; i++) {
    for (int j = 0; j < NUM_LEDS; j++) {
    leds[j] = blend(colors[currentColorIndex], colors[nextColorIndex], i);
    }
    FastLED.show();
    delay(delayTime);
  }

  // Increment the color index for the next iteration
  colorIndex++;

  // Reset color index when it exceeds the number of colors
  if (colorIndex == NUM_COLORS) {
    colorIndex = 0;
  }
}