This is a mini turntable for playing Super Mario theme song. It consists of 3 parts: play button (FSR), power(DC motor), and brightness reading part (photocell). Basic idea is as soon as you push a FSR over a certain threshold, DC motor will start. The motor drives CD disk rotated so that the surface of the disk reflects ambient lights enough to play music. The reflected light will be received by a photocell. 

 

 

/*

* Super Mario mini turntable

* Eungchan Kim

* 2013-03-12

* 

* SuperMario Sound from http://www.youtube.com/watch?v=VqeYvJpibLY

* http://www.arduino.cc/en/Tutorial/Melody

*/

    

int speakerPin = 7;

int motorPin = 8; // select the pin for the Motor

int photoPin = A0; 

int FSRPin=A1; // play button

 

int val =0;

int motorval= 0;

int threshold = 500; // for photocell

 

int length = 295; // the number of notes

char notes[] = "EE E CE G  g  C  g e  a b ia gEGA FG E CDb C  g e  a b ia gEGA FG E CDb  GNFR E uaC aCD GNFR E 1 11   GNFR E uaC aCD L  D C   CC C CD EC ag  CC C CDE  CC C CD EC ag  EE E CE G  g  C  g e  a b ia gEGA FG E CDb C  g e  a b ia gEGA FG E CDb EC g u aF Fa  bAAAGFEC ag  EC g u aF Fa  bF FFEDCe ec  "; // a space represents a rest

float beats[] = { 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 2, 1, 1, 2, 1, 1, 1, 1, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 2, 1, 1, 1, 1, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 2, //Page 1

                2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 2, 1, 1, 1, 1, 2, 1, 1, 2, 4, //Page 2

                1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 2, 1, 1, 1, 1, 1, 1, 1, 1, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 2, 1, 1, 2, //Page4

                1, 1, 1, 1, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 2, 1, 1, 1, 1, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 2, //Page 5

                1, 1, 1, 1, 2, 1, 1, 1, 1, 1, 1, 1, 1, 2, 1.3, 1.3, 1.3, 1.3, 1.3, 1.3, 1, 1, 1, 1, 1, 1, 2, 1, 1, 1, 1, 2, 1, 1, 1, 1, 1, 1, 1, 1, 2, 1, 1, 1, 1, 1.3, 1.3, 1.3, 1, 1, 1, 1, 1, 1, 2 }; //Page 6

                

int tempo = 95;

 

void playTone(int ton1, int duration) {

  for (long i = 0; i < duration * 1000L; i += ton1) {

    tone(speakerPin, ton1);

    delayMicroseconds(ton1);

  }

  noTone(speakerPin);

}

 

void playNote(char note, int duration) {

//                        c    c#   d    d#   e    f    f#   g    g#   a    a#   b

  char names[] = { ' ',  '!', '2', '3', '4', '5', '6', '7', '8', '9', '0', '-', '=', 'c', 'd', 'e', 'f', 'g', 'a', 'b', 'C', 'D', 'E', 'F', 'G', 'A', 'B', 'i', 'N', 'R', 'u',  '1', 'L', 'k'}; // [i = b flat] [N = G flat] [R = D#] [u = g#] [1 = C oct. 5] [L = E flat]

  int tones[] =  {   0, 1046, 138, 146, 155, 164, 174, 184, 195, 207, 220, 233, 246, 261, 293, 329, 349, 391, 440, 493, 523, 587, 659, 698, 783, 880, 987, 466, 740, 622, 415, 1046, 622u, 227};

  

  // play the tone corresponding to the note name

  for (int i = 0; i < 34; i++) {

    if (names[i] == note) {

      playTone(tones[i], duration);

    }

  }

}

 

void setup() {

  pinMode(speakerPin, OUTPUT);

  pinMode(motorPin, OUTPUT);

  pinMode(photoPin, INPUT);

  pinMode(FSRPin,INPUT);

  digitalWrite(LED[0],HIGH);

  Serial.begin(9600);

}

 

void loop() {

 

  for (int i = 0; i < length; i++) {

    motorval = analogRead(FSRPin);

    Serial.println(motorval);

    

    if (notes[i] == ' ') {

      delay(beats[i] * tempo); // rest

    } else {

      val = analogRead(photoPin);

      Serial.println(val);

      if (val > threshold){

        playNote(notes[i], beats[i] * tempo);

      }

      analogWrite(motorPin, motorval*0.25); 

    }

    

    // pause between notes

    delay(tempo / 2); 

  }

}

Demo