text: #ifndef SPEAKER_H_INCLUDED
  #define SPEAKER_H_INCLUDED
  
  /**
   * Piezo buzzer representing speaker.
   */
  class Speaker {
      private:
          // Number of pin buzzer is connected to
          int pin;
          
      public:
          /**
           * Default constructor.
           * 
           * @param pin Number of pin buzzer is connected to
           */
          Speaker(int pin);
  
          /**
           * Sets the pin to <code>HIGH</code>
           */
          void playSound();
  
          /**
           * Sets the pin to <code>LOW</code>
           */
          void muteSound();
  };
  
  #endif
  