toneAC v1.2 - Twice the volume, higher quality, higher frequency, etc.

Using Arduino Audio
24

Example 2 : A whistling kettle with boiling water sound.
This is a full sketch.

// Example for the toneAC library
// A whistling kettle with boiling water sound.
// public domain

#include <toneAC.h>

void setup()
{
}

void loop()
{
  int i, freq, freq_extra, freq_shift, vol;

  freq = 1440;
  vol = 1;

  for (i=0; i<1000; i++)
  {
    freq_shift = random (-15, 15);
    freq += freq_shift;
    
    // Stay around the frequency 1440
    if (freq < 1440)
      freq ++;
    else
      freq --;

    vol = i/50;      
    if (vol > 10)
      vol = 10;
    if (i > 800)
      freq_extra = (vol * vol) + 800;
    else
      freq_extra = (vol * vol) + i;
    
    toneAC( freq + freq_extra, vol, 0, true);
    delay(30);
  }
  noToneAC();
  
  delay(5000);
}