#include <FastLED.h>

#define LED_PIN     5 // Pin number connected to the LED strip
#define NUM_LEDS    60 // Number of LEDs in the strip
#define LED_TYPE    WS2812B // Type of the LED strip
#define COLOR_ORDER GRB // Color order of the LED strip

CRGB leds[NUM_LEDS]; // Define an array of CRGB objects representing each LED

// Function to convert color temperature to RGB values
void colorTemperatureToRGB(uint16_t kelvin, uint8_t& r, uint8_t& g, uint8_t& b) {
    // Calculate the red component
    if (kelvin <= 66) {
        r = 255;
    } else {
        double tempRed = 329.698727446 * pow((kelvin - 60), -0.1332047592);
        r = constrain(tempRed, 0, 255);
    }

    // Calculate the green component
    if (kelvin <= 66) {
        double tempGreen = 99.4708025861 * log(kelvin) - 161.1195681661;
        g = constrain(tempGreen, 0, 255);
    } else {
        double tempGreen = 288.1221695283 * pow((kelvin - 60), -0.0755148492);
        g = constrain(tempGreen, 0, 255);
    }

    // Calculate the blue component
    if (kelvin >= 66) {
        b = 255;
    } else if (kelvin <= 19) {
        b = 0;
    } else {
        double tempBlue = 138.5177312231 * log(kelvin - 10) - 305.0447927307;
        b = constrain(tempBlue, 0, 255);
    }
}

void setup() {
  FastLED.addLeds<LED_TYPE, LED_PIN, COLOR_ORDER>(leds, NUM_LEDS); // Initialize the LED strip
}

void loop() {
  // Set color temperature to daylight (5500K to 6500K)
  uint16_t kelvin = 6000; // You can adjust this value to your desired color temperature

  // Convert color temperature to RGB values
  uint8_t r, g, b;
  colorTemperatureToRGB(kelvin, r, g, b);

  // Set all LEDs to the calculated daylight color
  fill_solid(leds, NUM_LEDS, CRGB(r, g, b));

  // Show the updated LEDs
  FastLED.show();

  // Add a delay to control the speed of color changes
  delay(1000); // 1000 milliseconds = 1 second
}