void setup() {
pinMode(PB5, OUTPUT);
pinMode(PB6, OUTPUT);
pinMode(PB7, OUTPUT);
pinMode(PB8, OUTPUT);

}

void loop() {
digitalWrite(PB5, HIGH);
delay(1000);
digitalWrite(PB5, LOW);
delay(500);
digitalWrite(PB6, HIGH);
delay(1000);
digitalWrite(PB6, LOW);
delay(500);
digitalWrite(PB7, HIGH);
delay(1000);
digitalWrite(PB7, LOW);
delay(500);
digitalWrite(PB8, HIGH);
delay(1000);
digitalWrite(PB8, LOW);
delay(500);



}