Код на Arduino

• Фоторезистор - 1 шт.
• Пищалка (в моем случае пассивная) - 1 шт.
• Резистор на 1 кОм - 1 шт.

 #define PASSIVE_BUZZER_PIN 3                      // D3 
#define PHOTORESISTOR_PIN A0                      // AO 
 
#define SONG_COUNT_NOTES 98 
#define NO_LIGHT_VALUE 250 
 
static const uint16_t g_SongTones[SONG_COUNT_NOTES] = { 
    523, 587, 523, 440, 440, 440, 392, 440, 466, 440, 466, 392, 
    523, 440, 349, 294, 392, 262, 392, 587, 523, 466, 440, 392, 
    440, 466, 440, 330, 440, 440, 415, 494, 659, 587, 554, 587, 
    392, 440, 466, 440, 349, 587, 523, 349, 262, 466, 440, 392, 
    349, 523, 587, 523, 440, 440, 440, 392, 440, 466, 440, 466, 
    392, 523, 440, 349, 294, 392, 262, 392, 587, 523, 466, 440, 
    392, 440, 466, 440, 330, 440, 440, 415, 494, 659, 587, 554, 
    587, 392, 440, 466, 440, 349, 587, 523, 349, 262, 466, 440, 
    392, 349 
}; 
 
static const uint16_t g_SongToneDur[SONG_COUNT_NOTES] = { 
    489, 364, 119, 489, 489, 364, 119, 364, 119, 983, 489, 364, 
    119, 983, 489, 364, 119, 983, 1335, 244, 244, 244, 244, 244, 
    244, 244, 983, 489, 489, 489, 364, 119, 2074, 244, 244, 244, 
    244, 244, 489, 244, 244, 244, 983, 244, 244, 244, 489, 489, 
    983, 489, 364, 119, 489, 489, 364, 119, 364, 119, 983, 489, 
    364, 119, 983, 489, 364, 119, 983, 1335, 244, 244, 244, 244, 
    244, 244, 244, 983, 489, 489, 489, 364, 119, 2074, 244, 244, 
    244, 244, 244, 489, 244, 244, 244, 983, 244, 244, 244, 489, 
    489, 983 
}; 
 
static uint16_t g_CurNoteIndex = 0; 
 
void setup() 
{ 
    pinMode(PASSIVE_BUZZER_PIN, OUTPUT); 
} 
 
void loop() 
{ 
    int pValue = analogRead(PHOTORESISTOR_PIN); 
 
    if (pValue <= NO_LIGHT_VALUE) { 
        tone(PASSIVE_BUZZER_PIN, g_SongTones[g_CurNoteIndex]); 
        delay(g_SongToneDur[g_CurNoteIndex]); 
        noTone(PASSIVE_BUZZER_PIN); 
 
        g_CurNoteIndex++; 
    } 
    else 
        g_CurNoteIndex = 0; 
     
    if (g_CurNoteIndex == SONG_COUNT_NOTES) 
        g_CurNoteIndex = 0; 
}