Hello,
To begin, I am a complete novice at using this Arduino but I understand the code enough to mess around in it. This is using an arduino UNO and a wave shield with a serial RFID reader from parallax. Originally, the code for this can be found here:
https://cdn.makezine.com/make/28/CharlieBearV2.pde
-It is using the first 8 values from the RFID tag to play the audio file.
Here is my edited code:
// An interactive bear for Charlie -- RFID triggered sound responses
#include <FatReader.h>
#include <SdReader.h>
#include "WaveHC.h"
#include "WaveUtil.h"
#include "LowPower.h"
SdReader memcard;
FatVolume vol;
FatReader root;
FatReader file;
WaveHC wave;
#define ENABLE 7 // Set the pin number for enabling the RFID reader. The Audio Shield uses pins 2-5.
#define NUMTAGS 22
int val = 0;
char code[10];
String id;
int bytesread = 0;
char knowntags[NUMTAGS][11] = {"0300789D24", "2100E0B6ED", "2100DFF660", "2100DFD586", "2100DFB1E5", "2100E0CBAA", "2100E07B21", "2100E0B9D6", "2100D82331", "2100DFA060", "2100DFBC77", "2100DFA69A", "2100D7EFF7", "2100DFE251", "2100E02F09", "2100DFBF83", "2100DFD9EA", "2100E0ABA6", "2100DFDFC4", "2100DFF0DF", "36005B7B50", "36005B7C05"};
char soundfiles[NUMTAGS][9] = {"1000.WAV", "1001.WAV", "1002.WAV", "1003.WAV", "1004.WAV", "1005.WAV", "1006.WAV", "1007.WAV", "1008.WAV", "1009.WAV", "1010.WAV", "1011.WAV", "1012.WAV", "1013.WAV", "1014.WAV", "1015.WAV", "1016.WAV", "1017.WAV", "1018.WAV", "1019.WAV", "1020.WAV", "1021.WAV"};
char filename[1][14];
void setup() {
//////// Set up RFID reader to collect tag information /////////////////////
Serial.begin(2400); // RFID reader SOUT pin connected to Serial RX pin at 2400bps
pinMode(ENABLE,OUTPUT); // Set digital pin 7 as OUTPUT to connect it to the RFID /ENABLE pin
digitalWrite(ENABLE, LOW); // Activate the RFID reader
//////// Set the pins to output for driving the Audio Shield
pinMode(2, OUTPUT);
pinMode(3, OUTPUT);
pinMode(4, OUTPUT);
pinMode(5, OUTPUT);
////////// Set up the Audio Shield by initializing the memory card for reading ////////
if (!memcard.init()) {
// If something went wrong sdErrorCheck prints out the error check
putstring_nl("Card init. failed!");
cardErrorCheck();
return;
}
//This will optimize the reading of the memory card -- remove it if it times out
memcard.partialBlockRead(true);
// Find a FAT formatted partition by looking in teh first five slots. Remember your memory card should be FAT16 or FAT32 formatted
uint8_t partition;
for (partition = 0; partition < 5; partition++) {
if (vol.init(memcard, partition))
break;
}
if (partition == 5)
{
putstring_nl("No valid FAT partition");
cardErrorCheck();
while(1); // This is a point of no return. Format your memory card properly and try again.
}
// Open the root directory for reading the files
if (!root.openRoot(vol))
{
putstring_nl("Can't open root directory");
while(1); // Something went wrong here so investigate the file system on your memory card.
}
// If you got this far then the card is ready to read
filename[0][10] = 'a';
filename[0][11] = 'a';
filename[0][12] = 'a';
filename[0][13] = 'a';
putstring_nl("Ready to go");
wave.volume = 0;
}
// If we find an error, check what the error is and show it on the serial terminal
void cardErrorCheck(void)
{
if(!memcard.errorCode()) return;
putstring("\n\rSD I/O error:");
Serial.print(memcard.errorCode());
putstring(", ");
Serial.print(memcard.errorData());
while(1); // Stick here if there is an error
}
void loop() {
if(Serial.available() > 0) { // if data available from reader
if((val = Serial.read()) == 10) { // check for header
bytesread = 0;
while(bytesread<10) { // read 10 digit code
if( Serial.available() > 0) {
val = Serial.read();
if((val == 10)||(val == 13)) { // if header or stop bytes before the 10 digit reading
break; // stop reading
}
code[bytesread] = val; // add the digit
bytesread++; // ready to read next digit
}
}
if(bytesread == 10) { // if 10 digit read is complete
if (wave.isplaying)
{
//Stop the audio if tag "030091FACB" is read
if (strcmp(code,"030091FACB") == -10 )
{
silence();
}
}
else
{
//Serial.print(sizeof(code));
//char test = char(code) + '.wav';
//Serial.print(code);
playsound(code);
//Serial.print("TAG code is: "); // possibly a good TAG
//Serial.println(code); // print the TAG code
Serial.flush(); // Flush the serial buffer before trying to read a new code
}
}
bytesread = 0;
}
}
else
{
//low power library until woken up
//LowPower.powerDown(SLEEP_FOREVER, ADC_OFF, BOD_OFF);
//digitalWrite(ENABLE,HIGH); //Disable the RFID Attena
}
}
void playsound(char codetoplay[]) {
for(int i = 0; i<10; i++) { // Make a filename from the first 8 characters of the RFID tag number
filename[0][i]=codetoplay[i];
}
int i = 10;
while(filename[0][i] != '\0')
{
filename[0][10]='.';
filename[0][11]='w';
filename[0][12]='a';
filename[0][13]='v';
filename[0][14]='\0';
i++;
}
silence(); //shut down anything that is currently playing and close that file
playfile(filename[0]);
}
void playfile(char *name) {
if (!file.open(root, name)) {
putstring_nl("Couldn't open file");
return;
}
if (!wave.create(file))
{
putstring_nl("Not a valid WAV");
return;
}
wave.play();
}
void silence() {
if(wave.isplaying) {
wave.stop();
}
}
Specifically, in the playsound() method is where my problem begins. After the 13th column it seems to append more char's to the char array "filename" after the declared size of the column.
Output:
Ready to go
030091F9EA.wav030091F9EA
Couldn't open file
But when I use the while loop in my edited code I get:
Ready to go
030091F9EA.wavCouldn't open file
This gets me the desired name for the audio file, but it does not play the audio file on the SD card.
I will attach a picture for that.
My question is: Is it possible to have it read all 10 HEX values or do I have to stick to 8? with 8 it does not append after the declared column size.
