#define F_CPU 16000000UL

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


int main(void)
{	
	DDRB |= 0b00100000;		// Interne LED an PB5
    while (1) 
    {
		PORTB |= 0b00100000;	// PB5 an
		_delay_ms(2000);
		PORTB &= ~0b00100000;	// PB5 aus
		_delay_ms(1000);
    }
}