void setup() {
  pinMode(2, INPUT_PULLUP);
  pinMode(9, OUTPUT);
  Serial.begin(9600);
}

void loop() {
  if (digitalRead(2) == LOW) {
    Serial.println("Button 1 (C4) Pressed");
    tone(8, 262);
    delay(300);
    noTone(8);
    delay(100);
  }
}