pwm and for loops to create a simple sound

pwmAudioAlert

// hook up a speakers positive wire to your pwm pin
// speaker ground goes to ground 
// you can add in a potentiometer for volume control 
    // just put the pwm pin to one end lead of the pot 
    // the the middle pin on pot goes to the speakers (+)


// define the speaker pin. (pin 4 is D2 on the wemos mini)
#define speaker 4 

// define some frequencies 
int freq1 = 528;
int freq2 = 420;
int freq3 = 518;
int freq4 = 430;

//function using pwm and for loops to create a simple sound. 
void bleep()
{
  for (int i = 0; i < 15; i++)
  {
    freq1 += i; 
analogWriteRange(1023);
analogWriteFreq(freq1);
analogWrite(speaker,512);
delay(10);
  }
  freq1 = 580; 
  for (int i = 5; i > 0; i--)
  {
freq1 -= i; 
analogWriteRange(1023);
analogWriteFreq(freq1);
analogWrite(speaker,512);
delay(25);
  }

    for (int i = 0; i < 10; i++)
  {
freq3 += i; 
analogWriteRange(1023);
analogWriteFreq(freq3);
analogWrite(speaker,512);
delay(10);
  }
  
analogWriteRange(1023);
analogWriteFreq(freq1);
analogWrite(speaker,512);
delay(100);

  freq3 = 425;
  freq1 = 415;
}

void setup() {
pinMode (speaker, OUTPUT);
}

void loop() {
bleep();

//pause the sound for 5 seconds 
analogWrite(speaker,0);
delay(5000); 
}