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

#define BUZZER_PIN 7

int main(void) {
    DDRB |= (1 << BUZZER_PIN);

    while (1) {
        PORTB |= (1 << BUZZER_PIN);
        _delay_ms(200);

        PORTB &= ~(1 << BUZZER_PIN);
        _delay_ms(100); 
    }
}