int red_led = 11;
int green_led = 10;
int blue_led = 9;

void setup() {
  pinMode(red_led, OUTPUT);
  pinMode(green_led, OUTPUT);
  pinMode(blue_led, OUTPUT);
}

void loop() {
  led_color(0,255,255);
  delay(500);
  led_color(255,0,255);
  delay(500);
  led_color(255,0,0);
  delay(500);
  led_color(0,0,255);
  delay(500);
  led_color(0,0,0);
  delay(500);
  led_color(0,255,0);
  delay(500);
  led_color(255,255,255);
  delay(500);
}
void led_color(int red_value, int green_value,int blue_value)
{
  analogWrite(red_led,red_value);
  analogWrite(green_led,green_value);
  analogWrite(blue_led,blue_value);
}