// Find the most annoying buzzer frequency.
//
// Louder in Wokwi: 
//   1: Change the volume in "diagram.json"
// Louder in real life:
//   1: Put a box around it with a hole for the buzzer sound.
//   2: Use the toneAC library.

const int buzzerPin = 11;
const int tunePin = A0;
const int fineTunePin = A1;
const int extraFinePin = A2;

void setup() 
{
  Serial.begin(115200);
}

void loop() 
{
  int tune      = analogRead(tunePin);
  int finetune  = analogRead(fineTunePin);
  int extrafine = analogRead(extraFinePin);

  float t1 = (float) tune / 1023.0;
  float t2 = (float) finetune / 1023.0;
  float t3 = (float) extrafine / 1023.0;

  // Use a logaritmic scale for the first one.
  // Start at 35Hz, up to 10kHz.
  // The values are found by trying.
  // The lowest frequence for the Arduino Uno
  // with the tone() function is 31.
  //
  // The values are found by trying.
  float f1 = pow(sqrt(10000.0)  * t1, 2.0) + 35.0;
  float f2 = (1000.0 * t2) - 500.0;
  float f3 = (50.0 * t3) - 25.0;

  int frequency = (int) (f1 + f2 + f3);
  Serial.print(frequency);
  Serial.print(" Hz");
  if(frequency <= 31)
  {
    Serial.print(" !");
    noTone(buzzerPin);
  }
  else
  {
    tone(buzzerPin,frequency,200);
  }
  Serial.println();
  
  delay(200);
}