Petite code minimaliste et sans fioriture pour faire sonner un buzzer.

/*

  note  frequency

  c     262 Hz

  d     294 Hz

  e     330 Hz

  f     349 Hz

  g     392 Hz

  a     440 Hz

  b     494 Hz

  C     523 Hz

*/



	const int buzzerPin = 9;



// We'll set up an array with the notes we want to play

// change these values to make different songs!



// Length must equal the total number of notes and spaces 



const int songLength = 18;



// Notes is an array of text characters corresponding to the notes

// in your song. A space represents a rest (no tone)



char notes[] = "cdfda ag cdfdg gf "; // a space represents a rest



// Beats is an array of values for each note and rest.

// A "1" represents a quarter-note, 2 a half-note, etc.

// Don't forget that the rests (spaces) need a length as well.



int beats[] = {1,1,1,1,1,1,4,4,2,1,1,1,1,1,1,4,4,2};



// The tempo is how fast to play the song.

// To make the song play faster, decrease this value.



int tempo = 113;





void setup() {

  pinMode(buzzerPin, OUTPUT);

}





void loop() 

{

  int i, duration;



  for (i = 0; i < songLength; i++) // step through the song arrays

  {

    duration = beats[i] * tempo;  // length of note/rest in ms



    if (notes[i] == ' ')          // is this a rest? 

    {

      delay(duration);            // then pause for a moment

    } else {

      tone(buzzerPin, frequency(notes[i]), duration);

      delay(duration);            // wait for tone to finish

    }

    delay(tempo/10);              // brief pause between notes

  }



  // We only want to play the song once, so we'll pause forever:

  while(true){}

  // If you'd like your song to play over and over,

  // remove the above statement

}





int frequency(char note) 

{

  // This function takes a note character (a-g), and returns the

  // corresponding frequency in Hz for the tone() function.



  int i;

  const int numNotes = 8;  // number of notes we're storing



  // The following arrays hold the note characters and their

  // corresponding frequencies. The last "C" note is uppercase

  // to separate it from the first lowercase "c". If you want to

  // add more notes, you'll need to use unique characters.



  // For the "char" (character) type, we put single characters

  // in single quotes.



  char names[] = { 'c', 'd', 'e', 'f', 'g', 'a', 'b', 'C' };

  int frequencies[] = {262, 294, 330, 349, 392, 440, 494, 523};



  // Now we'll search through the letters in the array, and if

  // we find it, we'll return the frequency for that note.



  for (i = 0; i < numNotes; i++)  // Step through the notes

  {

    if (names[i] == note)         // Is this the one?

    {

      return(frequencies[i]);     // Yes! Return the frequency

    }

  }

  return(0);  // We looked through everything and didn't find it,

              // but we still need to return a value, so return 0.

}

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