text: /*
   * Copyright (c) 2019 Lori Hogan
   * All rights reserved.
   *
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions are met:
   *
   * * Redistributions of source code must retain the above copyright notice, this
   *   list of conditions and the following disclaimer.
   *
   * * Redistributions in binary form must reproduce the above copyright notice,
   *   this list of conditions and the following disclaimer in the documentation
   *   and/or other materials provided with the distribution.
   *
   * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
   * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
   * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
   * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
   * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
   * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
   * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
   * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   */
  
  #include "digital-support.h"
  
  //Functions to support various "typical" digital devices
  
  /**
   * This function plays a note of the given frequency using the Grove speaker/buzzer
   *
   * @param   	f     	the frequency of note to be played in Hz @pre > 0
   * @param		port  	the digital post into which the buzzer or speaker in connected
   * @param		seconds	approximate time in seconds you want note to play
   *
   * @returns     nothing
   * @modifies	plays a note from the speaker/buzzer corresponding to the frequency
   */
  void speakerPlayNote(int f, int port, float seconds)
  {
  
    //Convert frequency of note to time period in microseconds
    int time = 1000000.0 / (2 * f);
  
    //Send digital square wave to speaker with the calculated period
    for (int i = 0; i < 300*seconds; i++)
    {
      digitalWrite(port, HIGH);
      delayMicroseconds(time);
      digitalWrite(port, LOW);
      delayMicroseconds(time);
    }
  }
  