void setup() {
  Serial.begin(9600);
}


void loop() {
  pinMode(LED_BUILTIN, OUTPUT);
  digitalWrite(LED_BUILTIN, HIGH); 
  PINinfo();
  delay(1000);                      
  digitalWrite(LED_BUILTIN, LOW); 
  PINinfo();
  delay(1000);  
  pinMode(LED_BUILTIN, INPUT_PULLUP); 
  PINinfo();
  delay(1000);

}
void PINinfo(){
  Serial.print("Pin directions ");
  Serial.print(DDRB, BIN);
  Serial.print("      Pin states: ");
  Serial.println(PORTB, BIN);

}