/*
   very crazy blinken ;-)
   keine Ahnung, wofür das gut sein soll ;-)
*/
int pause = 500;

void setup() {
  // put your setup code here, to run once:

}

void loop() {
  // put your main code here, to run repeatedly:
  digitalWrite(PB0, HIGH);
  digitalWrite(PB5, LOW);
  digitalWrite(PB4, HIGH);
  delay(pause);
  digitalWrite(PB0, LOW);
  digitalWrite(PB5, HIGH);
  delay(pause);
  digitalWrite(PB0, HIGH);
  digitalWrite(PB5, HIGH);
  digitalWrite(PB4, LOW);
  delay(pause);
  digitalWrite(PB0, LOW);
  digitalWrite(PB5, LOW);
  delay(pause);
}