Knock Knock Music Box

/*************************************************
   NOTE FREQUENCYS
   *************************************************/
#define B0  31
#define C1  33
#define CS1 35
#define D1  37
#define DS1 39
#define E1  41
#define F1  44
#define FS1 46
#define G1  49
#define GS1 52
#define A1  55
#define AS1 58
#define B1  62
#define C2  65
#define CS2 69
#define D2  73
#define DS2 78
#define E2  82
#define F2  87
#define FS2 93
#define G2  98
#define GS2 104
#define A2  110
#define AS2 117
#define B2  123
#define C3  131
#define CS3 139
#define D3  147
#define DS3 156
#define E3  165
#define F3  175
#define FS3 185
#define G3  196
#define GS3 208
#define A3  220
#define AS3 233
#define B3  247
#define C4  262
#define CS4 277
#define D4  294
#define DS4 311
#define E4  330
#define F4  349
#define FS4 370
#define G4  392
#define GS4 415
#define A4  440
#define AS4 466
#define B4  494
#define C5  523
#define CS5 554
#define D5  587
#define DS5 622
#define E5  659
#define F5  698
#define FS5 740
#define G5  784
#define GS5 831
#define A5  880
#define AS5 932
#define B5  988
#define C6  1047
#define CS6 1109
#define D6  1175
#define DS6 1245
#define E6  1319
#define F6  1397
#define FS6 1480
#define G6  1568
#define GS6 1661
#define A6  1760
#define AS6 1865
#define B6  1976
#define C7  2093
#define CS7 2217
#define D7  2349
#define DS7 2489
#define E7  2637
#define F7  2794
#define FS7 2960
#define G7  3136
#define GS7 3322
#define A7  3520
#define AS7 3729
#define B7  3951
#define C8  4186
#define CS8 4435
#define D8  4699
#define DS8 4978
#define Silence 0

#include <LowPower.h>


int val; // variable for analogread piezo
int knockPin = 2; //interrupt on pin 2 or 3
volatile int interruptSwitch = 0;

unsigned long countInterval = 1200; //max time between knocks
unsigned long startTime;
unsigned long endTime;


//melody
int tempo = 330;
int melodyLength = 145;

int melody[] = {
  C4, E4, G4, E4, G4, E4, C4, E4, G4, E4, G4, E4, B3, E4, G4, E4, G4, E4, B3, E4, G4, E4, G4, E4,
  A3, E4, G4, E4, G4, E4, A3, E4, G4, E4, G4, E4, B3, E4, G4, E4, G4, E4, B3, E4, G4, E4, G4, E4,
  C5, E4, G4, E4, G4, E4, C5, E4, G4, E4, G4, E4, B4, E4, G4, E4, G4, E4, B4, E4, G4, E4, G4, E4,
  A4, E4, G4, E4, G4, E4, A4, E4, G4, E4, G4, E4, B4, E4, G4, E4, G4, E4, B4, E4, G4, E4, G4, E4,
  C5, E5, G5, E4, G5, E5, C5, E5, G5, E4, G5, E5, B4, E5, G5, E4, G5, E5, B4, E5, G5, E4, G5, E5,
  A4, E5, G5, E4, G5, E5, A4, E5, G5, E4, G5, E5, B4, E5, G5, E4, G5, E5, B4, E5, G5, E4, G5, E5,
  C5,
};

// note durations: 4 = quarter note, 8 = eighth note, etc.:
int noteDurations[] = {

  2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
  2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
  2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
  2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
  2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
  2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
  1,

};


// interrupt function
void Interrupt ()
{
  interruptSwitch = 1;
  detachInterrupt (knockPin);
}

void setup() {
  pinMode(knockPin, INPUT);
  Serial.begin (9600);
  attachInterrupt (digitalPinToInterrupt (knockPin), Interrupt, RISING);
}


void loop() {
  pinMode(knockPin, INPUT);
  val = digitalRead (knockPin);
  if (interruptSwitch == 1) {
    delay (200);
    startTime = millis ();
    endTime = millis ();
    while (endTime - countInterval < startTime) {
      val = digitalRead (knockPin);
      endTime = millis();
      if (val == HIGH) {
        for (int thisNote = 0; thisNote < melodyLength; thisNote++) {
          int noteDuration = tempo / noteDurations[thisNote];
          tone(2, melody[thisNote], noteDuration);
          int pauseBetweenNotes = noteDuration * 1.30;
          delay(pauseBetweenNotes);
          noTone(8);
        }
      }
      Serial.println (val);
      interruptSwitch = 0;
    }

  }
  else {
    LowPower.powerDown(SLEEP_8S, ADC_OFF, BOD_OFF);
  }
}