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

int main(void) {
    // Set Pin 13 (PORTB5) as Output
    DDRB |= (1 << DDB5);

    while (1) {
        // Toggle Pin 13
        PORTB ^= (1 << PORTB5);

        // Wait for 1 second
        _delay_ms(1000);
    }
}