// Define RGB LED pins (adjust if needed for your board)
#define LED_R  38  // Red pin
#define LED_G  39  // Green pin
#define LED_B  40  // Blue pin

// HSV to RGB conversion
void hsvToRgb(float h, float s, float v, int &r, int &g, int &b) {
  int i = int(h * 6);
  float f = h * 6 - i;
  float p = v * (1 - s);
  float q = v * (1 - f * s);
  float t = v * (1 - (1 - f) * s);

  switch (i % 6) {
    case 0: r = v * 255; g = t * 255; b = p * 255; break;
    case 1: r = q * 255; g = v * 255; b = p * 255; break;
    case 2: r = p * 255; g = v * 255; b = t * 255; break;
    case 3: r = p * 255; g = q * 255; b = v * 255; break;
    case 4: r = t * 255; g = p * 255; b = v * 255; break;
    case 5: r = v * 255; g = p * 255; b = q * 255; break;
  }
}

void setup() {
  // Set RGB pins as output
  pinMode(LED_R, OUTPUT);
  pinMode(LED_G, OUTPUT);
  pinMode(LED_B, OUTPUT);
}

void loop() {
  static float hue = 0.0;
  int r, g, b;

  // Convert hue to RGB
  hsvToRgb(hue, 1.0, 0.5, r, g, b);

  // Write RGB values using PWM
  analogWrite(LED_R, r);
  analogWrite(LED_G, g);
  analogWrite(LED_B, b);

  // Increment hue for next color
  hue += 0.01;
  if (hue > 1.0) hue = 0.0;

  delay(30); // Adjust for speed of transition
}