Arduino for Kids - PIR Alarm

/*
 * Arduino for Kids - PIR Intruder Alarm
 *
 * learnelectronics
 * 13 JUN 2017
 *
 * www.youtube.com/c/learnelectronics
 * [email protected]
 */


                                              //Here we define the frequency of all the notes used
#define  C0 16.35
#define Db0 17.32
#define D0  18.35
#define Eb0 19.45
#define E0  20.60
#define F0  21.83
#define Gb0 23.12
#define G0  24.50
#define Ab0 25.96
#define LA0 27.50
#define Bb0 29.14
#define B0  30.87
#define C1  32.70
#define Db1 34.65
#define D1  36.71
#define Eb1 38.89
#define E1  41.20
#define F1  43.65
#define Gb1 46.25
#define G1  49.00
#define Ab1 51.91
#define LA1 55.00
#define Bb1 58.27
#define B1  61.74
#define C2  65.41
#define Db2 69.30
#define D2  73.42
#define Eb2 77.78
#define E2  82.41
#define F2  87.31
#define Gb2 92.50
#define G2  98.00
#define Ab2 103.83
#define LA2 110.00
#define Bb2 116.54
#define B2  123.47
#define C3  130.81
#define Db3 138.59
#define D3  146.83
#define Eb3 155.56
#define E3  164.81
#define F3  174.61
#define Gb3 185.00
#define G3  196.00
#define Ab3 207.65
#define LA3 220.00
#define Bb3 233.08
#define B3  246.94
#define C4  261.63
#define Db4 277.18
#define D4  293.66
#define Eb4 311.13
#define E4  329.63
#define F4  349.23
#define Gb4 369.99
#define G4  392.00
#define Ab4 415.30
#define LA4 440.00
#define Bb4 466.16
#define B4  493.88
#define C5  523.25
#define Db5 554.37
#define D5  587.33
#define Eb5 622.25
#define E5  659.26
#define F5  698.46
#define Gb5 739.99
#define G5  783.99
#define Ab5 830.61
#define LA5 880.00
#define Bb5 932.33
#define B5  987.77
#define C6  1046.50
#define Db6 1108.73
#define D6  1174.66
#define Eb6 1244.51
#define E6  1318.51
#define F6  1396.91
#define Gb6 1479.98
#define G6  1567.98
#define Ab6 1661.22
#define LA6 1760.00
#define Bb6 1864.66
#define B6  1975.53
#define C7  2093.00
#define Db7 2217.46
#define D7  2349.32
#define Eb7 2489.02
#define E7  2637.02
#define F7  2793.83
#define Gb7 2959.96
#define G7  3135.96
#define Ab7 3322.44
#define LA7 3520.01
#define Bb7 3729.31
#define B7  3951.07
#define C8  4186.01
#define Db8 4434.92
#define D8  4698.64
#define Eb8 4978.03
                                              // DURATION OF THE NOTES
#define BPM 120                               //  you can change this value changing all the others
#define H 2*Q                                 //half 2/4
#define Q 60000/BPM                           //quarter 1/4
#define E Q/2                                 //eighth 1/8
#define S Q/4                                 // sixteenth 1/16
#define W 4*Q                                 // whole 4/4

void setup() {

pinMode(2,INPUT);                             //digital pin 2 set as an input for PIR sensor
pinMode(8, OUTPUT);                           //digital pin 8 set as output for speaker
pinMode(9, OUTPUT);                           //digital pin 9 set as output
digitalWrite(9,LOW);                          //digital pin 9 driven low

}

void alarm(){                                 //alarm function, plays Star Wars Imperial March
                                              //tone(pin, note, duration)
    tone(8,LA3,Q);
    delay(1+Q);                               //delay duration should always be 1 ms more than the note in order to separate them.
    tone(8,LA3,Q);
    delay(1+Q);
    tone(8,LA3,Q);
    delay(1+Q);
    tone(8,F3,E+S);
    delay(1+E+S);
    tone(8,C4,S);
    delay(1+S);

    tone(8,LA3,Q);
    delay(1+Q);
    tone(8,F3,E+S);
    delay(1+E+S);
    tone(8,C4,S);
    delay(1+S);
    tone(8,LA3,H);
    delay(1+H);

    tone(8,E4,Q);
    delay(1+Q);
    tone(8,E4,Q);
    delay(1+Q);
    tone(8,E4,Q);
    delay(1+Q);
    tone(8,F4,E+S);
    delay(1+E+S);
    tone(8,C4,S);
    delay(1+S);

    tone(8,Ab3,Q);
    delay(1+Q);
    tone(8,F3,E+S);
    delay(1+E+S);
    tone(8,C4,S);
    delay(1+S);
    tone(8,LA3,H);
    delay(1+H);

    tone(8,LA4,Q);
    delay(1+Q);
    tone(8,LA3,E+S);
    delay(1+E+S);
    tone(8,LA3,S);
    delay(1+S);
    tone(8,LA4,Q);
    delay(1+Q);
    tone(8,Ab4,E+S);
    delay(1+E+S);
    tone(8,G4,S);
    delay(1+S);

    tone(8,Gb4,S);
    delay(1+S);
    tone(8,E4,S);
    delay(1+S);
    tone(8,F4,E);
    delay(1+E);
    delay(1+E);//PAUSE
    tone(8,Bb3,E);
    delay(1+E);
    tone(8,Eb4,Q);
    delay(1+Q);
    tone(8,D4,E+S);
    delay(1+E+S);
    tone(8,Db4,S);
    delay(1+S);

    tone(8,C4,S);
    delay(1+S);
    tone(8,B3,S);
    delay(1+S);
    tone(8,C4,E);
    delay(1+E);
    delay(1+E);
    tone(8,F3,E);
    delay(1+E);
    tone(8,Ab3,Q);
    delay(1+Q);
    tone(8,F3,E+S);
    delay(1+E+S);
    tone(8,LA3,S);
    delay(1+S);

    tone(8,C4,Q);
    delay(1+Q);
     tone(8,LA3,E+S);
    delay(1+E+S);
    tone(8,C4,S);
    delay(1+S);
    tone(8,E4,H);
    delay(1+H);

     tone(8,LA4,Q);
    delay(1+Q);
    tone(8,LA3,E+S);
    delay(1+E+S);
    tone(8,LA3,S);
    delay(1+S);
    tone(8,LA4,Q);
    delay(1+Q);
    tone(8,Ab4,E+S);
    delay(1+E+S);
    tone(8,G4,S);
    delay(1+S);

    tone(8,Gb4,S);
    delay(1+S);
    tone(8,E4,S);
    delay(1+S);
    tone(8,F4,E);
    delay(1+E);
    delay(1+E);//PAUSE
    tone(8,Bb3,E);
    delay(1+E);
    tone(8,Eb4,Q);
    delay(1+Q);
    tone(8,D4,E+S);
    delay(1+E+S);
    tone(8,Db4,S);
    delay(1+S);

    tone(8,C4,S);
    delay(1+S);
    tone(8,B3,S);
    delay(1+S);
    tone(8,C4,E);
    delay(1+E);
    delay(1+E);
    tone(8,F3,E);
    delay(1+E);
    tone(8,Ab3,Q);
    delay(1+Q);
    tone(8,F3,E+S);
    delay(1+E+S);
    tone(8,C4,S);
    delay(1+S);

    tone(8,LA3,Q);
    delay(1+Q);
     tone(8,F3,E+S);
    delay(1+E+S);
    tone(8,C4,S);
    delay(1+S);
    tone(8,LA3,H);
    delay(1+H);

    delay(2*H);

}


void loop() {

 bool trigger=digitalRead(2);                 //define boolean (true/false) variable trigger as read of pin 2
 if(trigger){                                 //if trigger (pin 2 reads HIGH/TRUE/1)
  alarm();                                    //call alarm function
 }
}