TheCount.cc

// include SPI, MP3 and SD libraries
#include <SPI.h>
#include <Adafruit_VS1053.h>
#include <SD.h>

// 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)

int photoresistor = 15; // This is where your photoresistor is plugged in. The other side goes to the "power" pin (below).

const int darkValue = 25; 
const int lightValue = 75;

bool open = false;


// 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);
  
void setup() {
  Serial.begin(9600);
  Serial.println("Adafruit VS1053 Simple Test");

  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 found"));
  
  SD.begin(CARDCS);    // initialise the SD card
  
  // Set volume for left, right channels. lower numbers == louder volume!
  musicPlayer.setVolume(5,5);

  // If DREQ is on an interrupt pin (on uno, #2 or #3) we can do background
  // audio playing
  musicPlayer.useInterrupt(VS1053_FILEPLAYER_PIN_INT);  // DREQ int
}

// keeps state of which file to play next
int fileNum = 0;
char* filenames[] = {"track001.mp3", "track002.mp3", "track003.mp3", "track004.mp3", "track005.mp3", "track006.mp3", "track007.mp3", "track000.mp3"};

void loop() {
    int analogValue = analogRead(photoresistor);
    if (analogValue <= darkValue) {
      open = false;
    } else if (analogValue >= lightValue) {
        if (!open) {
            open = true;
          musicPlayer.playFullFile(filenames[fileNum % 8]);
          fileNum++;
            delay(2000);
        }
    }
}