Final project update 1

I'm working to create a force sensor that plays audio files when activated. It gives an value between 260 and 900 and, depending on what value it sends to the arduino, it plays a variable audio file. Here is the code I'm using.

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#include <FatReader.h>
#include <SdReader.h>
#include <avr/pgmspace.h>
#include "WaveUtil.h"
#include "WaveHC.h"


SdReader card;    // This object holds the information for the card
FatVolume vol;    // This holds the information for the partition on the card
FatReader root;   // This holds the information for the filesystem on the card
FatReader f;      // This holds the information for the file we're play

WaveHC wave;      // This is the only wave (audio) object, since we will only play one at a time

#define DEBOUNCE 5

int fsrPin = 0;     // the FSR and 10K pulldown are connected to a0
int fsrReading;     // the analog reading from the FSR resistor divider

byte buttons[] = {14};

#define NUMBUTTONS sizeof(buttons)

volatile byte pressed[NUMBUTTONS], justpressed[NUMBUTTONS], justreleased[NUMBUTTONS];

int freeRam(void)
 {
  extern int  __bss_end;
  extern int  *__brkval;
  int free_memory;
  if((int)__brkval == 0) {
    free_memory = ((int)&free_memory) - ((int)&__bss_end);
  }
  else {
    free_memory = ((int)&free_memory) - ((int)__brkval);
  }
  return free_memory;
}

void sdErrorCheck(void)
{
  if (!card.errorCode()) return;
  putstring("\n\rSD I/O error: ");
  Serial.print(card.errorCode(), HEX);
  putstring(", ");
  Serial.println(card.errorData(), HEX);
  while(1);
}

void setup() {
  byte i;
 
  // We'll send debugging information via the Serial monitor
  Serial.begin(9600);
  putstring("Free RAM: ");       // This can help with debugging, running out of RAM is bad
  Serial.println(freeRam());      // if this is under 150 bytes it may spell trouble!
  pinMode(2, OUTPUT);
  pinMode(3, OUTPUT);
  pinMode(4, OUTPUT);
  pinMode(5, OUTPUT);
  pinMode(13, OUTPUT);
  for (i=0; i< NUMBUTTONS; i++) {
    pinMode(buttons[i], INPUT);
    digitalWrite(buttons[i], HIGH);
  }
  if (!card.init()) {         //play with 8 MHz spi (default faster!)
    putstring_nl("Card init. failed!");  // Something went wrong, lets print out why
    sdErrorCheck();
    while(1);                            // then 'halt' - do nothing!
  }
  card.partialBlockRead(true);

// Now we will look for a FAT partition!
  uint8_t part;
  for (part = 0; part < 5; part++) {     // we have up to 5 slots to look in
    if (vol.init(card, part))
      break;                             // we found one, lets bail
  }
  if (part == 5) {                       // if we ended up not finding one  :(
    putstring_nl("No valid FAT partition!");
    sdErrorCheck();      // Something went wrong, lets print out why
    while(1);                            // then 'halt' - do nothing!
  }
  putstring("Using partition ");
  Serial.print(part, DEC);
  putstring(", type is FAT");
  Serial.println(vol.fatType(),DEC);     // FAT16 or FAT32?
 
  // Try to open the root directory
  if (!root.openRoot(vol)) {
    putstring_nl("Can't open root dir!"); // Something went wrong,
    while(1);                             // then 'halt' - do nothing!
  }
 
  // Whew! We got past the tough parts.
  putstring_nl("Ready!");
 
  TCCR2A = 0;
  TCCR2B = 1<<CS22 | 1<<CS21 | 1<<CS20;

  //Timer2 Overflow Interrupt Enable
  TIMSK2 |= 1<<TOIE2;


}

SIGNAL(TIMER2_OVF_vect) {
  check_switches();
}
void check_switches()
{
  static byte previousstate[NUMBUTTONS];
  static byte currentstate[NUMBUTTONS];
  byte index;

  for (index = 0; index < NUMBUTTONS; index++) {
    currentstate[index] = digitalRead(buttons[index]);   // read the button
   
    /*    
    Serial.print(index, DEC);
    Serial.print(": cstate=");
    Serial.print(currentstate[index], DEC);
    Serial.print(", pstate=");
    Serial.print(previousstate[index], DEC);
    Serial.print(", press=");
    */
   
    if (currentstate[index] == previousstate[index]) {
      if ((pressed[index] == LOW) && (currentstate[index] == LOW)) {
          // just pressed
          justpressed[index] = 1;
      }
      else if ((pressed[index] == HIGH) && (currentstate[index] == HIGH)) {
          // just released
          justreleased[index] = 1;
      }
      pressed[index] = !currentstate[index];  // remember, digital HIGH means NOT pressed
    }
    //Serial.println(pressed[index], DEC);
    previousstate[index] = currentstate[index];   // keep a running tally of the buttons
  }
}


void loop() {
  byte i;
  fsrReading = analogRead(fsrPin);
  Serial.print("fsrReading=");
  Serial.print(fsrReading);
  delay(200);
  if (justpressed[0] && fsrReading < 280) {
      justpressed[0] = 0;
     
  }
  else if (justpressed[0] && fsrReading > 800) {
      justpressed[0] = 0;
      playcomplete("CARLIN02.WAV");
  }
  else if (justpressed[0] && fsrReading > 770) {
      justpressed[0] = 0;
      playcomplete("CARLIN03.WAV");
  }
  else if (justpressed[0] && fsrReading > 740) {
      justpressed[0] = 0;
      playcomplete("CARLIN04.WAV");
  }
  else if (justpressed[0] && fsrReading > 710) {
      justpressed[0] = 0;
      playcomplete("CARLIN05.WAV");
  }
  else if (justpressed[0] && fsrReading > 680) {
      justpressed[0] = 0;
      playcomplete("CARLIN06.WAV");
  }
  else if (justpressed[0] && fsrReading > 650) {
      justpressed[0] = 0;
      playcomplete("CARLIN01.WAV");
  }
  else if (justpressed[0] && fsrReading > 620) {
      justpressed[0] = 0;
      playcomplete("CARLIN07.WAV");
  }
  else if (justpressed[0] && fsrReading > 590) {
      justpressed[0] = 0;
      playcomplete("CARLIN08.WAV");
  }
  else if (justpressed[0] && fsrReading > 560) {
      justpressed[0] = 0;
      playcomplete("CARLIN09.WAV");
  }
  else if (justpressed[0] && fsrReading > 530) {
      justpressed[0] = 0;
      playcomplete("CARLIN19.WAV");
  }
   else if (justpressed[0] && fsrReading > 500) {
      justpressed[0] = 0;
      playcomplete("CARLIN11.WAV");
  }
  else if (justpressed[0] && fsrReading > 470) {
      justpressed[0] = 0;
      playcomplete("CARLIN12.WAV");
  }
  else if (justpressed[0] && fsrReading > 440) {
      justpressed[0] = 0;
      playcomplete("CARLIN13.WAV");
  }
  else if (justpressed[0] && fsrReading > 410) {
      justpressed[0] = 0;
      playcomplete("CARLIN14.WAV");
  }
  else if (justpressed[0] && fsrReading > 380) {
      justpressed[0] = 0;
      playcomplete("CARLIN15.WAV");
  }
  else if (justpressed[0] && fsrReading > 350) {
      justpressed[0] = 0;
      playcomplete("CARLIN16.WAV");
  }
  else if (justpressed[0] && fsrReading > 320) {
      justpressed[0] = 0;
      playcomplete("CARLIN17.WAV");
  }
  else if (justpressed[0] && fsrReading > 290) {
      justpressed[0] = 0;
      playcomplete("CARLIN18.WAV");
  }

}

void playcomplete(char *name) {
  // call our helper to find and play this name
  playfile(name);
  while (wave.isplaying) {
  // do nothing while its playing
  }
  // now its done playing
}

void playfile(char *name) {
  // see if the wave object is currently doing something
  if (wave.isplaying) {// already playing something, so stop it!
    wave.stop(); // stop it
  }
  // look in the root directory and open the file
  if (!f.open(root, name)) {
    putstring("Couldn't open file "); Serial.print(name); return;
  }
  // OK read the file and turn it into a wave object
  if (!wave.create(f)) {
    putstring_nl("Not a valid WAV"); return;
  }
 
  // ok time to play! start playback
  wave.play();
}