# define pushButton01 15
# define pushButton02 2

void setup() {
  // put your setup code here, to run once:
  pinMode(pushButton01, INPUT);
  pinMode(pushButton02, INPUT);

  Serial.begin(9600);
}

void loop() {
  // put your main code here, to run repeatedly:
  int pushButtonState01 = digitalRead(pushButton01);
  int pushButtonState02 = digitalRead(pushButton02);

  if (pushButtonState01 == LOW){
    Serial.println("push button 01 is pressed.");
    delay(100);
  }

  if (pushButtonState02 == LOW){
    Serial.println("push button 02 is pressed.");
    delay(100);
  }
}