#define RED_PIN 3 
#define GREEN_PIN 5  
#define BLUE_PIN 6   

int main() {
  pinMode(RED_PIN, OUTPUT);
  pinMode(GREEN_PIN, OUTPUT);
  pinMode(BLUE_PIN, OUTPUT);

  while (true) {
    // Turn on red (assuming common anode RGB LED)
    analogWrite(RED_PIN, 255);  // Full brightness
    analogWrite(GREEN_PIN, 0);  // No green
    analogWrite(BLUE_PIN, 0);   // No blue
    delay(3000);  // Wait for 3 seconds

    // Turn on green
    analogWrite(RED_PIN, 0);    // No red
    analogWrite(GREEN_PIN, 255); // Full brightness
    analogWrite(BLUE_PIN, 0);   // No blue
    delay(3000);  // Wait for 3 seconds

    // Turn on blue
    analogWrite(RED_PIN, 0);    // No red
    analogWrite(GREEN_PIN, 0);  // No green
    analogWrite(BLUE_PIN, 255); // Full brightness
    delay(3000);  // Wait for 3 seconds
  }

  return 0;
}