#define F_CPU 1000000UL;
#include <avr/io.h>
#include <util/delay.h>
int main(void) {
    DDRB = 0x03;
    while(1){
    PORTB = 0x01;
    _delay_ms(1000);
    
    PORTB = 0x00;
    _delay_ms(1000);
}
return 0;
}