Hello everyone
I started using arduinos a few months ago, as a complete beginner at programming, trying to do as much as I can mainly by tweaking examples.
Now I am working on a project involving an arduino UNO, an adafruit Wave Shield and two FSR. The two sensors are placed in a pair of shoes, triggering a sound for every step. There is one sound per feet. I managed to build a code that is almost working (based on a lady ada code). The only issue is that when the feet is pressing the FSR, the sound keeps triggering thus producing a stutter effect and only playing through if the FSR is released.
Here is the code :
#include <WaveHC.h>
#include <WaveUtil.h>
#include <FatReader.h>
#include <SdReader.h>
#include <avr/pgmspace.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 volumes root directory
WaveHC wave; // This is the only wave (audio) object, since we will only play one at a time
FatReader f; // This holds the information for the file we're play
uint8_t dirLevel; // indent level for file/dir names (for prettyprinting)
dir_t dirBuf; // buffer for directory reads
int fsrAnalogPin0 = 0;
int fsrReading0;
int fsrAnalogPin1 = 1;
int fsrReading1;
/*
* Define macro to put error messages in flash memory
*/
#define error(msg) error_P(PSTR(msg))
// Function definitions (we define them here, but the code is below)
void play(FatReader &dir);
//////////////////////////////////// SETUP
void setup() {
Serial.begin(9600); // set up Serial library at 9600 bps for debugging
putstring_nl("\nWave test!"); // say we woke up!
putstring("Free RAM: "); // This can help with debugging, running out of RAM is bad
Serial.println(FreeRam());
// 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!)
error("Card init. failed!"); // Something went wrong, lets print out why
}
// 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 < 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 :(
error("No valid FAT partition!"); // Something went wrong, lets print out why
}
// 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)) {
error("Can't open root dir!"); // Something went wrong,
}
// Whew! We got past the tough parts.
putstring_nl("Files found (* = fragmented):");
// Print out all of the files in all the directories.
root.ls(LS_R | LS_FLAG_FRAGMENTED);
}
//////////////////////////////////// LOOP
void loop() {
fsrReading0 = analogRead(fsrAnalogPin0);
Serial.print("Analog reading 0= ");
Serial.println(fsrReading0);
fsrReading1 = analogRead(fsrAnalogPin1);
Serial.print("Analog reading 1= ");
Serial.println(fsrReading1);
if (fsrReading0 >= 800) {
playfile("PAS1.WAV");
}
else if (fsrReading1 >= 800) {
playfile("PAS2.WAV");
}
}
// Plays a full file from beginning to end with no pause.
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) {
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();
}
/////////////////////////////////// HELPERS
/*
* print error message and halt
*/
void error_P(const char *str) {
PgmPrint("Error: ");
SerialPrint_P(str);
sdErrorCheck();
while(1);
}
/*
* print error message and halt if SD I/O error, great for debugging!
*/
void sdErrorCheck(void) {
if (!card.errorCode()) return;
PgmPrint("\r\nSD I/O error: ");
Serial.print(card.errorCode(), HEX);
PgmPrint(", ");
Serial.println(card.errorData(), HEX);
while(1);
}
/*
* play recursively - possible stack overflow if subdirectories too nested
*/
void play(FatReader &dir) {
FatReader file;
while (dir.readDir(dirBuf) > 0) { // Read every file in the directory one at a time
// Skip it if not a subdirectory and not a .WAV file
if (!DIR_IS_SUBDIR(dirBuf)
&& strncmp_P((char *)&dirBuf.name[8], PSTR("WAV"), 3)) {
continue;
}
Serial.println(); // clear out a new line
for (uint8_t i = 0; i < dirLevel; i++) {
Serial.write(' '); // this is for prettyprinting, put spaces in front
}
if (!file.open(vol, dirBuf)) { // open the file in the directory
error("file.open failed"); // something went wrong
}
if (file.isDir()) { // check if we opened a new directory
putstring("Subdir: ");
printEntryName(dirBuf);
Serial.println();
dirLevel += 2; // add more spaces
// play files in subdirectory
play(file); // recursive!
dirLevel -= 2;
}
else {
// Aha! we found a file that isnt a directory
putstring("Playing ");
printEntryName(dirBuf); // print it out
if (!wave.create(file)) { // Figure out, is it a WAV proper?
putstring(" Not a valid WAV"); // ok skip it
} else {
Serial.println(); // Hooray it IS a WAV proper!
wave.play(); // make some noise!
uint8_t n = 0;
while (wave.isplaying) {// playing occurs in interrupts, so we print dots in realtime
putstring(".");
if (!(++n % 32))Serial.println();
delay(100);
}
sdErrorCheck(); // everything OK?
// if (wave.errors)Serial.println(wave.errors); // wave decoding errors
}
}
}
}
I think I understand why this is happening: if (fsrReading >= 800) then ‘playfile’ keeps stopping and starting again as it is asked to do. However I have no idea how to tell it not to do so and spending three hours investigating did not help, so I hope someone here can help me. I tried using ‘playcomplete’ instead but it does not allow the sounds to be interrupted (if the other FSR is pressed) and it results in the file playing in a loop if the FSR is not released, while I need it to play only once.