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#define LED_BUILTIN _BV(PORTB5)
int main(void) { DDRB |= LED_BUILTIN;
while (1)
{
PORTB |= LED_BUILTIN; // turn on led
_delay_ms(1000); // delay 1s
PORTB &= ~LED_BUILTIN; // turn off led
_delay_ms(1000); // delay 1s
}
}