Seinfeld Door Sensor

// Author c_alix on reddit

#include <SPI.h>
#include <Adafruit_VS1053.h>
#include <SD.h>

// These are the pins used for the breakout example
#define BREAKOUT_RESET  9      // VS1053 reset pin (output)
#define BREAKOUT_CS     10     // VS1053 chip select pin (output)
#define BREAKOUT_DCS    8      // VS1053 Data/command select pin (output)
// These are the pins used for the music maker shield
#define SHIELD_RESET  -1      // VS1053 reset pin (unused!)
#define SHIELD_CS     7      // VS1053 chip select pin (output)
#define SHIELD_DCS    6      // VS1053 Data/command select pin (output)

// These are common pins between breakout and shield
#define CARDCS 4     // Card chip select pin
// DREQ should be an Int pin, see http://arduino.cc/en/Reference/attachInterrupt
#define DREQ 3       // VS1053 Data request, ideally an Interrupt pin

Adafruit_VS1053_FilePlayer musicPlayer = Adafruit_VS1053_FilePlayer(SHIELD_RESET, SHIELD_CS, SHIELD_DCS, DREQ, CARDCS);



int n_files;
int led = 9;


void setup()
{
  Serial.begin(9600);
  Serial.println("Ready, Start!");

  pinMode(led, OUTPUT);
  pinMode(2,INPUT);

  // initialise the music player
  if (! musicPlayer.begin()) { // initialise the music player
    Serial.println(F("Couldn't find VS1053, do you have the right pins defined?"));
    while (1);
  }
  Serial.println(F("VS1053 chip found..."));


  musicPlayer.sineTest(0x44, 500);    // Make a tone to indicate VS1053 is working

  if (!SD.begin(CARDCS)) {
    Serial.println(F("SD failed, or not present"));
    while (1);  // don't do anything more
  }

  Serial.println("SD Card Loaded...");
  Serial.println();

  musicPlayer.setVolume(1,1);

  n_files = countMP3File(SD.open("/"));

  Serial.print("Number of MP3 files: ");
  Serial.println(n_files);
  Serial.println();
}

int countMP3File(File dir)
{
  int counter = 0;

  Serial.println("Listing files:");

  while(true)
  {
    File entry = dir.openNextFile();
    if (! entry)
    {
      dir.rewindDirectory();
      break;
    }

    Serial.println(entry.name());

    counter++;

    entry.close();
  }

  dir.close();

  Serial.println();
  return counter;
}


void loop()
{
  int i, rand_song;

  Serial.print("Motion Sensor Val: ");
  Serial.println(digitalRead(2));

  if (digitalRead(2) == 1)
  {
    File folder = SD.open("/");
    File random_file;

    rand_song = random(0, n_files)+1;

    folder.rewindDirectory();

    random_file = selectFileN(rand_song, folder);

    folder.close();

    Serial.print("Playing: ");
    Serial.println(random_file.name());

    // smoke machine
    //digitalWrite(led, LOW);

    if(!musicPlayer.playFullFile(random_file.name()))
    {
      Serial.println("Could not open mp3 file");
    }
    random_file.close();

    // stop smoke machine
    //digitalWrite(led, HIGH);

    Serial.println("Waiting 6 sec...");
    delay(6000);
  }


  Serial.println();
  delay(100);
}

File selectFileN(int number, File dir)
{
  int counter = 0;
  File return_entry;

  while(true)
  {
    File entry = dir.openNextFile();
    if (! entry)
    {
      //Serial.println("Last file reached");
      dir.rewindDirectory();
      break;
    }

    //Serial.println(entry.name());

    counter++;

    if(counter==number)
    {
      return_entry = entry;
      dir.rewindDirectory();
      break;
    }

    entry.close();
  }
  return return_entry;
}