/* Blinker Demo */

/* Include useful pre-defined functions */
#include <avr/interrupt.h>    // Defines pins, ports, etc to make programs easier to read
#define F_CPU 100000UL	      // Sets up the default speed for delay.h
#include <util/delay.h>

int main(){

  DDRD = _BV(PD4);		      /* enable output on port D, pin 4 */
	
  while(1){

    PORTD = _BV(PD4); 
    _delay_ms(1000);

    PORTD &= ~_BV(PD4);	
   _delay_ms(1000);

  }

  return(0);
}