int red_light_pin =11;
int green_light_pin =10;
int blue_light_pin = 9;

void setup() {
pinMode(red_light_pin ,OUTPUT);
pinMode(green_light_pin ,OUTPUT);
pinMode(blue_light_pin , OUTPUT);  
}

void loop() {
  rgb_color(255,0,0);
  delay(500);
  rgb_color(0,255,0);
  delay(500);
 rgb_color(0,0,255);
 delay(500);
}
void rgb_color(int red_light_value,int green_light_value, int blue_light_value)
{
  analogWrite(red_light_pin,red_light_value);
  analogWrite(green_light_pin,green_light_value);
  analogWrite(blue_light_pin,blue_light_value);

}