void setup() {
  // Initialize Serial communication for debugging

  // Configure PD1 as a digital output pin
  pinMode(PD1, OUTPUT);
  pinMode(PD2, OUTPUT);
}

void loop() {
  // Set PD1 high
  digitalWrite(PD1, HIGH);
  
  // Wait for 100 milliseconds
  delay(500);
  
  // Set PD1 low
  digitalWrite(PD1, LOW);
  
  // Wait for 100 milliseconds
  delay(500);
  // Set PD1 high
  digitalWrite(PD2, HIGH);
  
  // Wait for 100 milliseconds
  delay(500);
  
  // Set PD1 low
  digitalWrite(PD2, LOW);
  
  // Wait for 100 milliseconds
  delay(500);
}