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Topic: Modulate a sound file with flex sensor/Wave Shield (Read 695 times) previous topic - next topic

blue_mamba

So, here's what I'm trying to do: I need to be able to modulate the pitch of the sound file using a flex sensor. Everything is hooked up to a Wave Shield and I'm using the HC Wave library. The flex sensor works in another code where I modulate a frequency only, and the Wave Shield successfully plays the sound file. But when I try to hook them up together, it doesn't work. I know my code is not right (the "pitch" function uses the tone() command, which probably isn't the right one when working with a WAV file), and the playfile function is also not correct, seeing as I don't need to convert my file o a WAV, it's already in that format on the SD card. I copied and tried to tweak an example I found online and mix it with my own piece of code for the flex sensor. Can anyone help with this? I've been trying to figure this out for a while now...Thanks.

Code: [Select]
#include <FatReader.h>
#include <SdReader.h>
#include <avr/pgmspace.h>
#include "WaveUtil.h"
#include "WaveHC.h"

int flexSensor = 0;
int flexVal = 0;

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

// this handy function will return the number of bytes currently free in RAM, great for debugging!   
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() {
  // set up serial port
  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!
 
  // Set the output pins for the DAC control. This pins are defined in the library
  pinMode(2, OUTPUT);
  pinMode(3, OUTPUT);
  pinMode(4, OUTPUT);
  pinMode(5, OUTPUT);
 
   //  if (!card.init(true)) { //play with 4 MHz spi if 8MHz isn't working for you
  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!
  }
 
  // enable optimize read - some cards may timeout. Disable if you're having problems
  card.partialBlockRead(true);
 
  // Now we will look for a FAT partition!
  uint8_t part;
  for (part = 0; part < 1;){
       // _________________________________________________________________I CHANGED THIS!!!!!!!
    if (vol.init(card, part))
      break;                             // we found one, lets bail
  }
 
  if (part == 1) {                       // 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!
  }
 
// Lets tell the user about what we found
  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!");


void loop(){
  Serial.println(flexSensor);
  playcomplete();
  pitch();
}

void playcomplete(){
  playfile("moodbuzz.WAV");
  while (wave.isplaying){
  }
}

void playfile(char *moodbuzz) {
  // 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, moodbuzz)) {
    putstring("Couldn't open file "); Serial.print(moodbuzz); 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();
}
 
void pitch(){
  analogRead(flexSensor);
   int pitch = map(flexSensor, 200, 720, 120, 1500);
    tone(10, pitch, 10);
    delay(1);
}
 
 

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