text: #include<avr/io.h>
  #include<util/delay.h>
  
  #define BV(x) (1<<x)
  
  int main(void)
  {
      DDRC=0xFF;
      PORTC=0xFF;
      while (1)
      {
          PORTC=~(BV(5));
          _delay_ms(1000);
          PORTC=BV(5);
          _delay_ms(1000);
      }
      return 0;
  }
  