Wave Shield - Play Random File on Switch trigger?

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matthewflores
 
Posts: 8
Joined: Wed Apr 06, 2022 11:25 am

Wave Shield - Play Random File on Switch trigger?

Post by matthewflores »

Hi all,

Somewhat new to working with Arduino, and having some trouble adapting a sketch I found on the forums for my project.

I'm using a Wave Shield and want to use a micro switch as a trigger to play a random file from the SD. I can get the basic sketches to work, but can't figure out how to use roggesound's sketch to use a switch instead of a button.

Code: Select all

#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  // button debouncer

// here is where we define the buttons that we'll use. button "1" is the first, button "6" is the 6th, etc
byte buttons[] = {14, 15, 16, 17, 18, 19};
// This handy macro lets us determine how big the array up above is, by checking the size
#define NUMBUTTONS sizeof(buttons)
// we will track if a button is just pressed, just released, or 'pressed' (the current state
volatile byte pressed[NUMBUTTONS], justpressed[NUMBUTTONS], justreleased[NUMBUTTONS];

// 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() {
  byte i;
 
  // set up serial port
  Serial.begin(9600);
  putstring_nl("WaveHC with ");
  Serial.print(NUMBUTTONS, DEC);
  putstring_nl("buttons");
  randomSeed(analogRead(3));
 
  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);
 
  // pin13 LED
  pinMode(13, OUTPUT);
 
  // Make input & enable pull-up resistors on switch pins
  for (i=0; i< NUMBUTTONS; i++) {
    pinMode(buttons[i], INPUT);
    digitalWrite(buttons[i], HIGH);
  }
 
  //  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 < 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!
  }
 
  // 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!");
 
  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;
 
  if (justpressed[0]) {
      justpressed[0] = 0;
      i = random(20);
       if (i == 0) {
           playcomplete("0.WAV");
       } else if (i == 1) {
           playcomplete("1.WAV");
       } else if (i == 2) {
           playcomplete("2.WAV");
       } else if (i == 3) {
           playcomplete("3.WAV");
       } else if (i == 4) {
           playcomplete("4.WAV");
       } else if (i == 5) {
           playcomplete("5.WAV");
       } else if (i == 6) {
           playcomplete("6.WAV");
       } else if (i == 7) {
           playcomplete("7.WAV");
       } else if (i == 8) {
           playcomplete("8.WAV");
       } else if (i == 9) {
           playcomplete("9.WAV");
       } else if (i == 10) {
           playcomplete("10.WAV");
       } else if (i == 11) {
           playcomplete("11.WAV");
       } else if (i == 12) {
           playcomplete("12.WAV");
       } else if (i == 13) {
           playcomplete("13.WAV");
       } else if (i == 14) {
           playcomplete("14.WAV");
       } else if (i == 15) {
           playcomplete("15.WAV");
       } else if (i == 16) {
           playcomplete("16.WAV");
       } else if (i == 17) {
           playcomplete("17.WAV");
       } else if (i == 18) {
           playcomplete("18.WAV");   
       } else {
           playcomplete("19.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) {
  // 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();
}
Could someone point me in the right direction, both in terms of adjusting the sketch, and what's best practice for wiring up the switch? Thank you!!

User avatar
adafruit_support_bill
 
Posts: 88037
Joined: Sat Feb 07, 2009 10:11 am

Re: Wave Shield - Play Random File on Switch trigger?

Post by adafruit_support_bill »

A button and a switch are all the same as far as the code is concerned.

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matthewflores
 
Posts: 8
Joined: Wed Apr 06, 2022 11:25 am

Re: Wave Shield - Play Random File on Switch trigger?

Post by matthewflores »

Okay! So, if I only need the one switch, all I need to do is wire the the Common leg of the switch to GND, and the NO leg to the first button defined - in this case, 14 (A0), and it should keep track of when the switch has been pressed, am I reading this correctly?

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adafruit_support_bill
 
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Joined: Sat Feb 07, 2009 10:11 am

Re: Wave Shield - Play Random File on Switch trigger?

Post by adafruit_support_bill »

Yes, that should work.

Looking at the code, there is one possible issue. The way the button pins are initialized is a bit outdated and will not work on some of the newer Arduino boards.

If you are using an Arduino UNO or equivalent (Atmega328 microcontroller) you should have no problems. If you are using one of the ARM-based processors like the Due or Zero, you will need to make some code changes.

User avatar
matthewflores
 
Posts: 8
Joined: Wed Apr 06, 2022 11:25 am

Re: Wave Shield - Play Random File on Switch trigger?

Post by matthewflores »

I got it to work, thank you!

Do you have a recommendation on how to update the button pin initialization? I'm using an UNO so it's working fine, but am curious if I can manage to simplify the sketch.

User avatar
adafruit_support_bill
 
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Joined: Sat Feb 07, 2009 10:11 am

Re: Wave Shield - Play Random File on Switch trigger?

Post by adafruit_support_bill »

Change this code:

Code: Select all

      for (i=0; i< NUMBUTTONS; i++) {
        pinMode(buttons[i], INPUT);
        digitalWrite(buttons[i], HIGH);
      }
to this:

Code: Select all

      for (i=0; i< NUMBUTTONS; i++) {
        pinMode(buttons[i], INPUT_PULLUP);
      }
That should work for all processors.

User avatar
matthewflores
 
Posts: 8
Joined: Wed Apr 06, 2022 11:25 am

Re: Wave Shield - Play Random File on Switch trigger?

Post by matthewflores »

Bill, this worked perfectly, thank you!

Following up with a question about an LED, can I simply plop something like:

Code: Select all

#define LED 13  // The pin the LED is connected to
void setup() {
  pinMode(LED, OUTPUT); // Declare the LED as an output
}

void loop() {
  digitalWrite(LED, HIGH); // Turn the LED on
}
near the top of the sketch to have it also turn on an LED when powered up?

User avatar
adafruit_support_bill
 
Posts: 88037
Joined: Sat Feb 07, 2009 10:11 am

Re: Wave Shield - Play Random File on Switch trigger?

Post by adafruit_support_bill »

Yes, that should work.

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