#include <avr/io.h>
#include <avr/delay.h>
int main()
{
DDRB = 0b00000001; // Set PB0 pin mode to OUTPUT
while(1)
{
PORTB = 0b00000001; // Set PB0 state to HIGH
_delay_ms(500); // Delay 500 ms
PORTB = ~0b00000001; // Set PB0 state to LOW
_delay_ms(500); // Delay 500 ms
}
}