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

int main(void)
{
    /* PB4 output */
    DDRB  |=  _BV(4);
    PORTB &= ~_BV(4);

    //for (;;)
    //{
    //    _delay_ms(1000);
    //    PORTB ^= _BV(4);
    //}

    // wait for 45s and enable the amplifier
    for (uint8_t i = 0; i < 32; ++i) {
        _delay_ms(1000);
    }
    PORTB |= _BV(4);

    return 0;
}