   pinMode(LED_PIN, OUTPUT);
   // Initialize serial communication for debugging.
   Serial.begin(9600);
-
 }
 
 int buttonState = 0;

      // went from off to on:
      Serial.println("on");

      // Light the LED.
      digitalWrite(LED_PIN, HIGH);
      delay(100);
      digitalWrite(LED_PIN, LOW);

    } else {
      Serial.println("off");
    }
    // Delay a little bit to avoid bouncing.
    delay(50);
  }
  lastButtonState = buttonState;
}
const int BUTTON_PIN = 12;
const int LED_PIN = 13;
const int PIEZO_PIN = 8;

// See https://www.arduino.cc/en/Tutorial/StateChangeDetection

