void setup() {
  // put your setup code here, to run once:
  pinMode(23,OUTPUT);
  pinMode(22,OUTPUT);
}

void loop() {
  digitalWrite(23, HIGH);
  digitalWrite(22, LOW);

  delay(500);

  digitalWrite(23, LOW);
  digitalWrite(22, HIGH);

  delay(500);
  // put your main code here, to run repeatedly:
  // this speeds up the simulation
}