// PWM pins for RGB
const int redPin = 9;
const int greenPin = 10;
const int bluePin = 11;

void setup() {
  // Set RGB pins as outputs
  pinMode(redPin, OUTPUT);
  pinMode(greenPin, OUTPUT);
  pinMode(bluePin, OUTPUT);
}

void loop() {
  // Fade RED from 0 to 255
  for (int i = 0; i <= 255; i++) {
    setColor(i, 0, 0);   // Increase red
    delay(40);
  }

  // Fade GREEN from 0 to 255
  for (int i = 0; i <= 255; i++) {
    setColor(0, i, 0);   // Increase green
    delay(50);
  }

  // Fade BLUE from 0 to 255
  for (int i = 0; i <= 255; i++) {
    setColor(0, 0, i);   // Increase blue
    delay(50);
  }

  // Optionally, fade all back to 0 for a clean loop
  for (int i = 255; i >= 0; i--) {
    setColor(i, i, i);   // Fade all down
    delay(50);
  }
}

// Function to set RGB values using PWM
void setColor(int red, int green, int blue) {
  analogWrite(redPin, red);
  analogWrite(greenPin, green);
  analogWrite(bluePin, blue);
}