Teensy 3.6 + prop shield playing WAV files

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snowskijunky

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Hello! I'm working on a model train sound board and need to get it playing multiple wav files at once. Right now, I'm just trying to play the test files and not having much luck despite looking through much of the tutorial material. First off, here is the code I am using as of right now:

Code: 
// Advanced Microcontroller-based Audio Workshop
//
// http://www.pjrc.com/store/audio_tutorial_kit.html
// https://hackaday.io/project/8292-microcontroller-audio-workshop-had-supercon-2015
// 
// Part 1-3: First "Hello World" program, play a music file
//
// WAV files for this and other Tutorials are here:
// http://www.pjrc.com/teensy/td_libs_AudioDataFiles.html

#include <Audio.h>
#include <Wire.h>
#include <SPI.h>
#include <SD.h>
#include <SerialFlash.h>

AudioPlaySdWav           playSdWav1;
//AudioMixer4            mixer1;
AudioOutputAnalog        dac1;
AudioConnection          myConnection(playSdWav1, 0, dac1, 0);
//AudioConnection          patchCord2(playSdWav1, 1, dac1, 1);
//AudioConnection          patchCord2(mixer1, dac1);
//AudioControlSGTL5000     sgtl5000_1;

// Use these with the Teensy Audio Shield
//#define SDCARD_CS_PIN    10
//#define SDCARD_MOSI_PIN  7
//#define SDCARD_SCK_PIN   14

// Use these with the Teensy 3.5 & 3.6 SD card
#define SDCARD_CS_PIN    BUILTIN_SDCARD
#define SDCARD_MOSI_PIN  11  // not actually used
#define SDCARD_SCK_PIN   13  // not actually used

// Use these for the SD+Wiz820 or other adaptors
//#define SDCARD_CS_PIN    4
//#define SDCARD_MOSI_PIN  11
//#define SDCARD_SCK_PIN   13


void setup() {
  pinMode(13, OUTPUT);     
  AudioMemory(20);
  dac1.analogReference(EXTERNAL); // much louder!
  delay(50);             // time for DAC voltage stable
  pinMode(5, OUTPUT);
  digitalWrite(5, HIGH); // turn on the amplifier
  delay(10);             // allow time to wake up
  Serial.begin(9600);
  //sgtl5000_1.enable();
  //sgtl5000_1.volume(0.5);
  SPI.setMOSI(SDCARD_MOSI_PIN);
  SPI.setSCK(SDCARD_SCK_PIN);
  if (!(SD.begin(SDCARD_CS_PIN))) {
    while (1) {
      Serial.println("Unable to access the SD card");
      delay(500);
    }
  }
  delay(1000);
  digitalWrite(13, HIGH);
  delay(2000);
}

void loop() {
  if (playSdWav1.isPlaying() == false) {
    Serial.println("Start playing");
    playSdWav1.play("SDTEST1.WAV");
    delay(10); // wait for library to parse WAV info
    digitalWrite(13, LOW);
  }
  // do nothing while playing...
}

Here are a few pictures of my physical setup. The DAC on the prop shield is connected to DA0 on the teensy 3.6... as far as I can tell from the reading I've done, this should be the correct connection for audio output. I've tried two different speakers that I have... one a VECO 8 ohm 2 watt speaker, another a really tiny VECO 4 ohm 3 watt speaker. Both seem to make a faint popping noise when the program runs.

https://www.dropbox.com/s/iapezwmkwwdh55v/20170803_124337.jpg?dl=0
https://www.dropbox.com/s/se8xbfe5euvoxa7/20170803_124419.jpg?dl=0
https://www.dropbox.com/s/12avz99luzrkmgy/20170803_124438.jpg?dl=0

I've also tested the read/write and cardinfo for the sd card, with success:
https://www.dropbox.com/s/h7673rxy3u7su8s/sdtest.JPG?dl=0

Any assistance with this would be much appreciated... I might just need a second set of eyes, I've been working with this thing for two days now, its possible I'm hoping I've just overlooked something silly.
 
wire soldered to shield in your first photo looks wrong. the DAC hole on the shield is the hole nearest the edge
 
Just from a quick look your audio connection needs, you can give it a try:

Code: 
AudioConnection          patchCord1(playSdWav1, 0, dac1, 0);


The other thing I found is that not all wav files that you download are in the right format, they need to be formatted to 44100hz, you can use Audacity for that. With that said SDTEST1.wav should not need conversion.
 
Hi Manitou. So patchCord can be anything you define as the connection. It just a convenient nomenclature if you use the design tool?
 
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