doorbell.ino

/*
  
  Doorbell

  Passive Buzzer/Piezoelectric Speaker
  * Digital output 8
  * Other end of speaker connected to GND

  Pushbutton (for doorbell):
  * Digital input 2
  * Pulled down with 10k resistor to GND
  * Other end of switch connected to 5V

*/

// include pitches and song header files
#include "pitches.h"
#include "songs.h"

// use these to configure speaker and button pins
#define BUTTON_PIN 2
#define SPEAKER_PIN 8

// put your setup code here, to run once:
void setup() {

  // seed random() function so that we get a different order
  randomSeed(analogRead(0));

  // setup your pins here

}

// put your main code here, to run repeatedly:
void loop() {

  // check the switch state

  // add an if statement if the switch is pressed
  
    // randomly choose a song
    // put these 2 lines of code inside of your if statement
    int song_choice = random(5);
    select_song(song_choice);
  
}

/***    DON'T TOUCH CODE BELOW HERE    ***/

/* selects the song to play */
void select_song(int selection) {
  // make sure it's a number between 0-4
  selection %= 5;
  if (selection == 0) {
    play_song(haircutLength,haircut,haircutDurations,haircutTempo);
  }
  else if (selection == 1) {
    play_song(marioLength,mario,marioDurations,marioTempo);
  }
  else if (selection == 2) {
    play_song(miiLength,mii,miiDurations,miiTempo);
  }
  else if (selection == 3) {
    play_song(hpLength,hp,hpDurations,hpTempo);
  }
  else if (selection == 4) {
    play_song(takeonmeLength,takeonme,takeonmeDurations,takeonmeTempo);
  }
}

/* plays the song */
void play_song(int num_notes, int melody[], int noteDurations[], int tempo) {
  // step through and play all of the notes
  for (int i=0; i<num_notes; i++){
    int duration = 0;
    // calculate the duration of each note
    if (noteDurations[i] > 0) {
      duration = tempo / noteDurations[i];
    }
    // if it's a negative number, means dotted note
    // increases the duration by half for dotted notes
    else if (noteDurations[i] < 0) {
      duration = tempo / abs(noteDurations[i]) * 1.5;
    }
    tone(SPEAKER_PIN, melody[i], duration);
    // to distinguish the notes, set a minimum time between them.
    // the note's duration + 30% seems to work well:
    int pauseBetweenNotes = duration * 1.30;
    delay(pauseBetweenNotes);
    // stop the tone playing:
    noTone(SPEAKER_PIN);
  }
}

pitches.h

#define REST      0
#define NOTE_B0  31
#define NOTE_C1  33
#define NOTE_CS1 35
#define NOTE_D1  37
#define NOTE_DS1 39
#define NOTE_E1  41
#define NOTE_F1  44
#define NOTE_FS1 46
#define NOTE_G1  49
#define NOTE_GS1 52
#define NOTE_A1  55
#define NOTE_AS1 58
#define NOTE_B1  62
#define NOTE_C2  65
#define NOTE_CS2 69
#define NOTE_D2  73
#define NOTE_DS2 78
#define NOTE_E2  82
#define NOTE_F2  87
#define NOTE_FS2 93
#define NOTE_G2  98
#define NOTE_GS2 104
#define NOTE_A2  110
#define NOTE_AS2 117
#define NOTE_B2  123
#define NOTE_C3  131
#define NOTE_CS3 139
#define NOTE_D3  147
#define NOTE_DS3 156
#define NOTE_E3  165
#define NOTE_F3  175
#define NOTE_FS3 185
#define NOTE_G3  196
#define NOTE_GS3 208
#define NOTE_A3  220
#define NOTE_AS3 233
#define NOTE_B3  247
#define NOTE_C4  262
#define NOTE_CS4 277
#define NOTE_D4  294
#define NOTE_DS4 311
#define NOTE_E4  330
#define NOTE_F4  349
#define NOTE_FS4 370
#define NOTE_G4  392
#define NOTE_GS4 415
#define NOTE_A4  440
#define NOTE_AS4 466
#define NOTE_B4  494
#define NOTE_C5  523
#define NOTE_CS5 554
#define NOTE_D5  587
#define NOTE_DS5 622
#define NOTE_E5  659
#define NOTE_F5  698
#define NOTE_FS5 740
#define NOTE_G5  784
#define NOTE_GS5 831
#define NOTE_A5  880
#define NOTE_AS5 932
#define NOTE_B5  988
#define NOTE_C6  1047
#define NOTE_CS6 1109
#define NOTE_D6  1175
#define NOTE_DS6 1245
#define NOTE_E6  1319
#define NOTE_F6  1397
#define NOTE_FS6 1480
#define NOTE_G6  1568
#define NOTE_GS6 1661
#define NOTE_A6  1760
#define NOTE_AS6 1865
#define NOTE_B6  1976
#define NOTE_C7  2093
#define NOTE_CS7 2217
#define NOTE_D7  2349
#define NOTE_DS7 2489
#define NOTE_E7  2637
#define NOTE_F7  2794
#define NOTE_FS7 2960
#define NOTE_G7  3136
#define NOTE_GS7 3322
#define NOTE_A7  3520
#define NOTE_AS7 3729
#define NOTE_B7  3951
#define NOTE_C8  4186
#define NOTE_CS8 4435
#define NOTE_D8  4699
#define NOTE_DS8 4978

songs.h

/* 

 * Song definitions - 4 variables per song
 * 1st array defines notes in melody
 * 2nd array defines duration of notes
   * Note durations:
   * 4 = quarter note, 8 = eighth note, etc.
 * Int length of song i.e. number of notes
 * Int tempo multiplier

*/

#include "pitches.h"

void select_song(int selection);
void play_song(int num_notes, int melody[], int noteDurations[], int tempo);

/* shave and a haircut */
int haircut[] = {
  NOTE_C4, NOTE_G3, NOTE_G3, NOTE_A3, NOTE_G3, REST, NOTE_B3, NOTE_C4
};
int haircutDurations[] = {
  4, 8, 8, 4, 4, 4, 4, 4
};
int haircutLength = 8;
int haircutTempo = 1000;

/* mario theme */
int mario[] = {
  NOTE_E4, NOTE_E4, REST, NOTE_E4, REST, NOTE_C4, NOTE_E4, REST, NOTE_G4, REST, NOTE_G3
};
int marioDurations[] = {
  8, 8, 8, 8, 8, 8, 8, 8, 8, 3, 8
};
int marioLength = 11;
int marioTempo = 1000;

/* mii theme */
int mii[] = {
  NOTE_FS4, REST, NOTE_A4, NOTE_CS5, REST, NOTE_A4, REST, NOTE_FS4,
  NOTE_D4, NOTE_D4, NOTE_D4, REST, NOTE_D5, NOTE_D5, NOTE_D5
};
int miiDurations[] = {
  8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8
};
int miiLength = 15;
int miiTempo = 1600;

/* harry potter */
int hp[] = {
  NOTE_D4, NOTE_G4, NOTE_AS4, NOTE_A4, NOTE_G4, NOTE_D5, NOTE_C5,
  NOTE_A4, NOTE_G4, NOTE_AS4, NOTE_A4, NOTE_F4, NOTE_GS4, NOTE_D4
};
int hpDurations[] = {
  4, -4, 8, 4, 2, 4, -2, -2, -4, 8, 4, 2, 4, 1
};
int hpLength = 14;
int hpTempo = 1050;

/* take on me */
int takeonme[] = {
  NOTE_FS5, NOTE_FS5, NOTE_D5, NOTE_B4, REST, NOTE_B4, REST, NOTE_E5,
  REST, NOTE_E5, REST, NOTE_E5, NOTE_GS5, NOTE_GS5, NOTE_A5, NOTE_B5,
  NOTE_A5, NOTE_A5, NOTE_A5, NOTE_E5, REST, NOTE_D5, REST, NOTE_FS5, 
  REST, NOTE_FS5, REST, NOTE_FS5, NOTE_E5, NOTE_E5, NOTE_FS5, NOTE_E5
};
int takeonmeDurations[] = {
  8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8,
  8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8
};
int takeonmeLength = 32;
int takeonmeTempo = 1200;