// https://wokwi.com/projects/452494236197117953

# define INTERVAL 777  

void setup() {
  Serial.begin(115200);
  Serial.println("\nhi Mom!\n");
}

void loop() {
  Serial.println("STEP ONE");

  digitalWrite(2, HIGH);
  pinMode(3, OUTPUT);

  Serial.println("wrote 2 HIGH     set pin 3 OUTPUT");
  Serial.println("");

  delay(INTERVAL);

  Serial.println("STEP TWO");

  digitalWrite(3, HIGH);
  pinMode(2, OUTPUT);

  Serial.println("wrote 3 HIGH     set pin 2 OUTPUT");
  Serial.println("");

  delay(INTERVAL);

  pinMode(2, INPUT);
  pinMode(3, INPUT);

  Serial.println("reset 2 and 3 (INPUT mode)");

  Serial.println("\nWanna see that again? Pay attention!\n");

  delay(3 * INTERVAL);
}