Rain alarm - Proto 3 - Passive Buzzer + PWM Modulation

main.cpp

#include "Arduino.h"

#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
#define REST 0

int buzzer = 13;

void play();

int tempo = 88;
int melody[] = {
    /*
    The legend of Zelda theme
    Connect a piezo buzzer or speaker to pin 11 or select a new pin.
    More songs available at https://github.com/robsoncouto/arduino-songs

    Robson Couto, 2019
    */

    NOTE_AS4, 4, NOTE_F4, -4, NOTE_AS4, 8, NOTE_AS4, 16, NOTE_C5, 16, NOTE_D5, 16, NOTE_DS5, 16, // 7
    NOTE_F5, 2, NOTE_F5, 8, NOTE_F5, 8, NOTE_F5, 8, NOTE_FS5, 16, NOTE_GS5, 16,
    NOTE_AS5, -2, NOTE_AS5, 8, NOTE_AS5, 8, NOTE_GS5, 8, NOTE_FS5, 16,
    NOTE_GS5, -8, NOTE_FS5, 16, NOTE_F5, 2, NOTE_F5, 4,

    NOTE_DS5, -8, NOTE_F5, 16, NOTE_FS5, 2, NOTE_F5, 8, NOTE_DS5, 8, // 11
    NOTE_CS5, -8, NOTE_DS5, 16, NOTE_F5, 2, NOTE_DS5, 8, NOTE_CS5, 8,
    NOTE_C5, -8, NOTE_D5, 16, NOTE_E5, 2, NOTE_G5, 8,
    NOTE_F5, 16, NOTE_F4, 16, NOTE_F4, 16, NOTE_F4, 16, NOTE_F4, 16, NOTE_F4, 16, NOTE_F4, 16, NOTE_F4, 16, NOTE_F4, 8, NOTE_F4, 16, NOTE_F4, 8,

    NOTE_AS4, 4, NOTE_F4, -4, NOTE_AS4, 8, NOTE_AS4, 16, NOTE_C5, 16, NOTE_D5, 16, NOTE_DS5, 16, // 15
    NOTE_F5, 2, NOTE_F5, 8, NOTE_F5, 8, NOTE_F5, 8, NOTE_FS5, 16, NOTE_GS5, 16,
    NOTE_AS5, -2, NOTE_CS6, 4,
    NOTE_C6, 4, NOTE_A5, 2, NOTE_F5, 4,
    NOTE_FS5, -2, NOTE_AS5, 4,
    NOTE_A5, 4, NOTE_F5, 2, NOTE_F5, 4,

    NOTE_FS5, -2, NOTE_AS5, 4,
    NOTE_A5, 4, NOTE_F5, 2, NOTE_D5, 4,
    NOTE_DS5, -2, NOTE_FS5, 4,
    NOTE_F5, 4, NOTE_CS5, 2, NOTE_AS4, 4,
    NOTE_C5, -8, NOTE_D5, 16, NOTE_E5, 2, NOTE_G5, 8,
    NOTE_F5, 16, NOTE_F4, 16, NOTE_F4, 16, NOTE_F4, 16, NOTE_F4, 16, NOTE_F4, 16, NOTE_F4, 16, NOTE_F4, 16, NOTE_F4, 8, NOTE_F4, 16, NOTE_F4, 8};

int notes = sizeof(melody) / sizeof(melody[0]) / 2;
int wholenote = (60000 * 4) / tempo;
int divider = 0, noteDuration = 0;

void setup()
{
    ledcSetup(0, 1000, 8);

    play();
}

void loop()
{
    // Empty.
}

void play()
{
    for (int thisNote = 0; thisNote < notes * 2; thisNote = thisNote + 2)
    {
        divider = melody[thisNote + 1];
        if (divider > 0)
        {
            noteDuration = (wholenote) / divider;
        }
        else if (divider < 0)
        {
            noteDuration = (wholenote) / abs(divider);
            noteDuration *= 1.5;
        }
        tone(buzzer, melody[thisNote], noteDuration * 0.9);
        delay(noteDuration);
        noTone(buzzer);
    }
}