#define LED_RED 13
#define LED_GREEN 12
#define LED_BLUE 8

void setup() 
{
  pinMode(LED_RED, OUTPUT);
  pinMode(LED_GREEN, OUTPUT);
  pinMode(LED_BLUE, OUTPUT);
}

void loop() 
{
  int cycle = (millis() % 8000)/1000;
  int red = cycle % 2;
  int green = (cycle % 4) / 2;
  int blue = (cycle % 8) / 4;
 
  digitalWrite(LED_RED, !red);
  digitalWrite(LED_GREEN, !green);
  digitalWrite(LED_BLUE, !blue);

  //cycle = 0(000) - Выключено
  //cycle = 1(001) - Красный
  //cycle = 2(010) - Зелёный
  //cycle = 3(011) - жёлтый
  //cycle = 4(100) - Синий
  //cycle = 5(101) - Сиреневый
  //cycle = 6(110) - Бюриюзовый
  //cycle = 7(111) - Белый    
}