#include <avr/io.h>
#include <util/delay.h>

int main(void)
{
DDRB |= (1 << PB1);
while (1)
{
PORTB |= ( 1 << PB1);
_delay_ms(1000);

PORTB &= ~( 1<<PB1);
_delay_ms(5000);
}
}