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#include <avr/io.h>
#include <util/delay.h>
int main() {
DDRB |= _BV(DDB3);
while (1) {
PORTB |= _BV(PORTB3);
_delay_ms(500);
PORTB &= ~_BV(PORTB3);
_delay_ms(500);
}
}
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