#define RED 9
#define GREEN 10
#define BLUE 11

void setup() {
  pinMode(RED, OUTPUT);
  pinMode(GREEN, OUTPUT);
  pinMode(BLUE, OUTPUT);
}

void setColor(int r, int g, int b) {
  // Invert values for common anode
  analogWrite(RED, 255 - r);
  analogWrite(GREEN, 255 - g);
  analogWrite(BLUE, 255 - b);
}

void loop() {
  setColor(255, 0, 0);   // Red
  delay(1000);

  setColor(0, 255, 0);   // Green
  delay(1000);

  setColor(0, 0, 255);   // Blue
  delay(1000);

  setColor(255, 255, 255); // White
  delay(1000);
}