RED LED at 13, BLUE LED at 12 - Police Lights

int main() {
  DDRB = B00110000;
  PINB = 1 << PINB5;
  while (true) {
    PINB = B00110000;
    for (long i = 0; i < 500000; i++) {
     asm("");
    }
  }
}

Tags: Arduino, AVR, ATmega