#include <avr/io.h>
void setup(){
  DDRB = 32; // set PB5 as an output pin 0b00100000
  while(true){
     PORTB= 32; //make PB5 HIGH (5Volts)
     delay(100);
     PORTB= 0; //make PB5 LOW (0 Volts)
     delay(100);
  }
}
void loop(){
  }