#define RED_PIN    3  // Connect to the red pin of the RGB LED
#define GREEN_PIN  4 // Connect to the green pin of the RGB LED
#define BLUE_PIN   5 // Connect to the blue pin of the RGB LED

void setup() {
  pinMode(RED_PIN, OUTPUT);
  pinMode(GREEN_PIN, OUTPUT);
  pinMode(BLUE_PIN, OUTPUT);
}

void loop() {
  // Display Cyan
  analogWrite(RED_PIN, 0);
  analogWrite(GREEN_PIN, 255);
  analogWrite(BLUE_PIN, 255);
  delay(1000);

  // Display Magenta
  analogWrite(RED_PIN, 255);
  analogWrite(GREEN_PIN, 0);
  analogWrite(BLUE_PIN, 255);
  delay(1000);

  // Display Yellow
  analogWrite(RED_PIN, 255);
  analogWrite(GREEN_PIN, 255);
  analogWrite(BLUE_PIN, 0);
  delay(1000);
}