Teensy 4.0 - based Audio Guestbook
- Thread starter tedm
- Start date
JFS_Heart_O
New member
I am new to Teensy and am attempting the Wedding Audio Guestbook. I have the Teensy 4.0 and corresponding Audio shield. I followed the original author's full updated instructions to the best of my ability and updated code. I have worked through a handful of errors when compiling and I am now stuck on this one.
In file included from C:\Users\Justin\OneDrive\Documents\Arduino\AudioGuestbook\AudioGuestbook.ino:27:0:
C:\Program Files (x86)\Arduino\hardware\teensy\avr\libraries\Audio/effect_granular.h:26:7: error: redefinition of 'class AudioEffectGranular'
class AudioEffectGranular : public AudioStream
^
In file included from C:\Program Files (x86)\Arduino\hardware\teensy\avr\libraries\Audio/Audio.h:87:0,
from C:\Users\Justin\OneDrive\Documents\Arduino\AudioGuestbook\AudioGuestbook.ino:9:
C:\Program Files (x86)\Arduino\hardware\teensy\avr\libraries\Audio/effect_granular.h:26:7: error: previous definition of 'class AudioEffectGranular'
class AudioEffectGranular : public AudioStream
^
Error compiling for board Teensy 4.0.
In file included from C:\Users\Justin\OneDrive\Documents\Arduino\AudioGuestbook\AudioGuestbook.ino:27:0:
C:\Program Files (x86)\Arduino\hardware\teensy\avr\libraries\Audio/effect_granular.h:26:7: error: redefinition of 'class AudioEffectGranular'
class AudioEffectGranular : public AudioStream
^
In file included from C:\Program Files (x86)\Arduino\hardware\teensy\avr\libraries\Audio/Audio.h:87:0,
from C:\Users\Justin\OneDrive\Documents\Arduino\AudioGuestbook\AudioGuestbook.ino:9:
C:\Program Files (x86)\Arduino\hardware\teensy\avr\libraries\Audio/effect_granular.h:26:7: error: previous definition of 'class AudioEffectGranular'
class AudioEffectGranular : public AudioStream
^
Error compiling for board Teensy 4.0.
CarlingRules
New member
Hello I'm getting the exact same error messages and i have 1.57.2 installed
Audio_Guestbookerror: 'playRawl' was not declared in this scope
AudioConnection patchCord3(playRawl, 0, mixer, 2); // wav file playback mixer
^
Audio_Guestbook variable or field 'setup' declared void
void setup{} {
^
Multiple libraries were found for "SD.h"
Used: C:\Program Files (x86)\Arduino\hardware\teensy\avr\libraries\SD
Not used: C:\Program Files (x86)\Arduino\libraries\SD
'playRawl' was not declared in this scope
This report would have more information with
"Show verbose output during compilation"
option enabled in File -> Preferences.
Audio_Guestbookerror: 'playRawl' was not declared in this scope
AudioConnection patchCord3(playRawl, 0, mixer, 2); // wav file playback mixer
^
Audio_Guestbook variable or field 'setup' declared void
void setup{} {
^
Multiple libraries were found for "SD.h"
Used: C:\Program Files (x86)\Arduino\hardware\teensy\avr\libraries\SD
Not used: C:\Program Files (x86)\Arduino\libraries\SD
'playRawl' was not declared in this scope
This report would have more information with
"Show verbose output during compilation"
option enabled in File -> Preferences.
Last edited:
JFS_Heart_O
New member
From what I could tell the error seemed to have an issue that AudioGuestbook sketch had line 9 state:
#include <Audio.h>, which defines effect_granular
...and also had line 27 state:
#include <effect_granular.h>
So I change removed line 27 (changed to a comment by adding /* before and */ after), Then the code went all the way thru and said "Done compiling".
/*#include <effect_granular.h>*/
#include <Audio.h>, which defines effect_granular
...and also had line 27 state:
#include <effect_granular.h>
So I change removed line 27 (changed to a comment by adding /* before and */ after), Then the code went all the way thru and said "Done compiling".
/*#include <effect_granular.h>*/
I also have the clicking noise with MTP disable during recording. Here is my code.
I get this error when compiling
Code:
/**
* Audio Guestbook, Copyright (c) 2022 Playful Technology
*
* Tested using a Teensy 4.0 with Teensy Audio Shield, although should work
* with minor modifications on other similar hardware
*
* When handset is lifted, a pre-recorded greeting message is played, followed by a tone.
* Then, recording starts, and continues until the handset is replaced.
* Playback button allows all messages currently saved on SD card through earpiece
*
* Files are saved on SD card as 44.1kHz, 16-bit, mono signed integer RAW audio format
* --> changed this to WAV recording, DD4WH 2022_07_31
* --> added MTP support, which enables copying WAV files from the SD card via the USB connection, DD4WH 2022_08_01
*
*
* Frank DD4WH, August 1st 2022
* for a DBP 611 telephone (closed contact when handheld is lifted) & with recording to WAV file
* contact for switch button 0 is closed when handheld is lifted
*
* GNU GPL v3.0 license
*
*/
#include <Bounce.h>
#include <Audio.h>
#include <Wire.h>
#include <SPI.h>
#include <SD.h>
#include <TimeLib.h>
#include <MTP_Teensy.h>
#include "play_sd_wav.h" // local copy with fixes
// DEFINES
// Define pins used by Teensy Audio Shield
#define SDCARD_CS_PIN 10
#define SDCARD_MOSI_PIN 7
#define SDCARD_SCK_PIN 14
// And those used for inputs
#define HOOK_PIN 0
#define PLAYBACK_BUTTON_PIN 1
#define noINSTRUMENT_SD_WRITE
// GLOBALS
// Audio initialisation code can be generated using the GUI interface at https://www.pjrc.com/teensy/gui/
// Inputs
AudioSynthWaveform waveform1; // To create the "beep" sfx
AudioInputI2S i2s2; // I2S input from microphone on audio shield
AudioPlaySdWav playWav1; // Play 44.1kHz 16-bit PCM greeting WAV file
AudioRecordQueue queue1; // Creating an audio buffer in memory before saving to SD
AudioMixer4 mixer; // Allows merging several inputs to same output
AudioOutputI2S i2s1; // I2S interface to Speaker/Line Out on Audio shield
AudioConnection patchCord1(waveform1, 0, mixer, 0); // wave to mixer
AudioConnection patchCord3(playWav1, 0, mixer, 1); // wav file playback mixer
AudioConnection patchCord4(mixer, 0, i2s1, 0); // mixer output to speaker (L)
AudioConnection patchCord6(mixer, 0, i2s1, 1); // mixer output to speaker (R)
AudioConnection patchCord5(i2s2, 0, queue1, 0); // mic input to queue (L)
AudioControlSGTL5000 sgtl5000_1;
// Filename to save audio recording on SD card
char filename[15];
// The file object itself
File frec;
// Use long 40ms debounce time on both switches
Bounce buttonRecord = Bounce(HOOK_PIN, 40);
Bounce buttonPlay = Bounce(PLAYBACK_BUTTON_PIN, 40);
// Keep track of current state of the device
enum Mode {Initialising, Ready, Prompting, Recording, Playing};
Mode mode = Mode::Initialising;
float beep_volume = 0.2f; // not too loud :-)
uint32_t MTPcheckInterval; // default value of device check interval [ms]
// variables for writing to WAV file
unsigned long ChunkSize = 0L;
unsigned long Subchunk1Size = 16;
unsigned int AudioFormat = 1;
unsigned int numChannels = 1;
unsigned long sampleRate = 44100;
unsigned int bitsPerSample = 16;
unsigned long byteRate = sampleRate*numChannels*(bitsPerSample/8);// samplerate x channels x (bitspersample / 8)
unsigned int blockAlign = numChannels*bitsPerSample/8;
unsigned long Subchunk2Size = 0L;
unsigned long recByteSaved = 0L;
unsigned long NumSamples = 0L;
byte byte1, byte2, byte3, byte4;
void setup() {
Serial.begin(9600);
while (!Serial && millis() < 5000) {
// wait for serial port to connect.
}
Serial.println("Serial set up correctly");
Serial.printf("Audio block set to %d samples\n",AUDIO_BLOCK_SAMPLES);
print_mode();
// Configure the input pins
pinMode(HOOK_PIN, INPUT_PULLUP);
pinMode(PLAYBACK_BUTTON_PIN, INPUT_PULLUP);
// Audio connections require memory, and the record queue
// uses this memory to buffer incoming audio.
AudioMemory(60);
// Enable the audio shield, select input, and enable output
sgtl5000_1.enable();
// Define which input on the audio shield to use (AUDIO_INPUT_LINEIN / AUDIO_INPUT_MIC)
sgtl5000_1.inputSelect(AUDIO_INPUT_MIC);
//sgtl5000_1.adcHighPassFilterDisable(); //
sgtl5000_1.volume(0.5);
mixer.gain(0, 1.0f);
mixer.gain(1, 1.0f);
// Play a beep to indicate system is online
waveform1.begin(beep_volume, 440, WAVEFORM_SINE);
wait(1000);
waveform1.amplitude(0);
delay(1000);
// Initialize the SD card
SPI.setMOSI(SDCARD_MOSI_PIN);
SPI.setSCK(SDCARD_SCK_PIN);
if (!(SD.begin(SDCARD_CS_PIN)))
{
// stop here if no SD card, but print a message
while (1) {
Serial.println("Unable to access the SD card");
delay(500);
}
}
else Serial.println("SD card correctly initialized");
// mandatory to begin the MTP session.
MTP.begin();
// Add SD Card
// MTP.addFilesystem(SD, "SD Card");
MTP.addFilesystem(SD, "Spike Events Audio Guestbook"); // choose a nice name for the SD card volume to appear in your file explorer
Serial.println("Added SD card via MTP");
MTPcheckInterval = MTP.storage()->get_DeltaDeviceCheckTimeMS();
// Value in dB
// sgtl5000_1.micGain(15);
sgtl5000_1.micGain(35); // much lower gain is required for the AOM5024 electret capsule
// Synchronise the Time object used in the program code with the RTC time provider.
// See https://github.com/PaulStoffregen/Time
setSyncProvider(getTeensy3Time);
// Define a callback that will assign the correct datetime for any file system operations
// (i.e. saving a new audio recording onto the SD card)
FsDateTime::setCallback(dateTime);
mode = Mode::Ready; print_mode();
}
void loop() {
// First, read the buttons
buttonRecord.update();
buttonPlay.update();
switch(mode){
case Mode::Ready:
// Falling edge occurs when the handset is lifted --> 611 telephone
if (buttonRecord.risingEdge()) {
Serial.println("Handset lifted");
mode = Mode::Prompting; print_mode();
}
else if(buttonPlay.fallingEdge()) {
//playAllRecordings();
playLastRecording();
}
break;
case Mode::Prompting:
// Wait a second for users to put the handset to their ear
wait(50);
// Play the greeting inviting them to record their message
playWav1.play("greeting.wav");
// Wait until the message has finished playing
// while (playWav1.isPlaying()) {
while (!playWav1.isStopped()) {
// Check whether the handset is replaced
buttonRecord.update();
buttonPlay.update();
// Handset is replaced
if(buttonRecord.fallingEdge()) {
playWav1.stop();
mode = Mode::Ready; print_mode();
return;
}
if(buttonPlay.fallingEdge()) {
playWav1.stop();
//playAllRecordings();
playLastRecording();
return;
}
}
// Debug message
Serial.println("Starting Recording");
// Play the tone sound effect
waveform1.begin(beep_volume, 440, WAVEFORM_SINE);
wait(1250);
waveform1.amplitude(0);
// Start the recording function
startRecording();
break;
case Mode::Recording:
// Handset is replaced
if(buttonRecord.fallingEdge()){
// Debug log
Serial.println("Stopping Recording");
// Stop recording
stopRecording();
// Play audio tone to confirm recording has ended
end_Beep();
}
else {
continueRecording();
}
break;
case Mode::Playing: // to make compiler happy
break;
case Mode::Initialising: // to make compiler happy
break;
}
MTP.loop(); // This is mandatory to be placed in the loop code.
}
void setMTPdeviceChecks(bool nable)
{
if (nable)
{
MTP.storage()->set_DeltaDeviceCheckTimeMS(MTPcheckInterval);
Serial.print("En");
}
else
{
MTP.storage()->set_DeltaDeviceCheckTimeMS((uint32_t) -1);
Serial.print("Dis");
}
Serial.println("abled MTP storage device checks");
}
#if defined(INSTRUMENT_SD_WRITE)
static uint32_t worstSDwrite, printNext;
#endif // defined(INSTRUMENT_SD_WRITE)
void startRecording() {
setMTPdeviceChecks(false); // disable MTP device checks while recording
#if defined(INSTRUMENT_SD_WRITE)
worstSDwrite = 0;
printNext = 0;
#endif // defined(INSTRUMENT_SD_WRITE)
// Find the first available file number
// for (uint8_t i=0; i<9999; i++) { // BUGFIX uint8_t overflows if it reaches 255
for (uint16_t i=0; i<9999; i++) {
// Format the counter as a five-digit number with leading zeroes, followed by file extension
snprintf(filename, 11, " %05d.wav", i);
// Create if does not exist, do not open existing, write, sync after write
if (!SD.exists(filename)) {
break;
}
}
frec = SD.open(filename, FILE_WRITE);
Serial.println("Opened file !");
if(frec) {
Serial.print("Recording to ");
Serial.println(filename);
queue1.begin();
mode = Mode::Recording; print_mode();
recByteSaved = 0L;
}
else {
Serial.println("Couldn't open file to record!");
}
}
void continueRecording() {
#if defined(INSTRUMENT_SD_WRITE)
uint32_t started = micros();
#endif // defined(INSTRUMENT_SD_WRITE)
#define NBLOX 16
// Check if there is data in the queue
if (queue1.available() >= NBLOX) {
byte buffer[NBLOX*AUDIO_BLOCK_SAMPLES*sizeof(int16_t)];
// Fetch 2 blocks from the audio library and copy
// into a 512 byte buffer. The Arduino SD library
// is most efficient when full 512 byte sector size
// writes are used.
for (int i=0;i<NBLOX;i++)
{
memcpy(buffer+i*AUDIO_BLOCK_SAMPLES*sizeof(int16_t), queue1.readBuffer(), AUDIO_BLOCK_SAMPLES*sizeof(int16_t));
queue1.freeBuffer();
}
// Write all 512 bytes to the SD card
frec.write(buffer, sizeof buffer);
recByteSaved += sizeof buffer;
}
#if defined(INSTRUMENT_SD_WRITE)
started = micros() - started;
if (started > worstSDwrite)
worstSDwrite = started;
if (millis() >= printNext)
{
Serial.printf("Worst write took %luus\n",worstSDwrite);
worstSDwrite = 0;
printNext = millis()+250;
}
#endif // defined(INSTRUMENT_SD_WRITE)
}
void stopRecording() {
// Stop adding any new data to the queue
queue1.end();
// Flush all existing remaining data from the queue
while (queue1.available() > 0) {
// Save to open file
frec.write((byte*)queue1.readBuffer(), AUDIO_BLOCK_SAMPLES*sizeof(int16_t));
queue1.freeBuffer();
recByteSaved += AUDIO_BLOCK_SAMPLES*sizeof(int16_t);
}
writeOutHeader();
// Close the file
frec.close();
Serial.println("Closed file");
mode = Mode::Ready; print_mode();
setMTPdeviceChecks(true); // enable MTP device checks, recording is finished
}
void playAllRecordings() {
// Recording files are saved in the root directory
File dir = SD.open("/");
while (true) {
File entry = dir.openNextFile();
if (strstr(entry.name(), "greeting"))
{
entry = dir.openNextFile();
}
if (!entry) {
// no more files
entry.close();
end_Beep();
break;
}
//int8_t len = strlen(entry.name()) - 4;
// if (strstr(strlwr(entry.name() + (len - 4)), ".raw")) {
// if (strstr(strlwr(entry.name() + (len - 4)), ".wav")) {
// the lines above throw a warning, so I replace them with this (which is also easier to read):
if (strstr(entry.name(), ".wav") || strstr(entry.name(), ".WAV")) {
Serial.print("Now playing ");
Serial.println(entry.name());
// Play a short beep before each message
waveform1.amplitude(beep_volume);
wait(750);
waveform1.amplitude(0);
// Play the file
playWav1.play(entry.name());
mode = Mode::Playing; print_mode();
}
entry.close();
// while (playWav1.isPlaying()) { // strangely enough, this works for playRaw, but it does not work properly for playWav
while (!playWav1.isStopped()) { // this works for playWav
buttonPlay.update();
buttonRecord.update();
// Button is pressed again
// if(buttonPlay.risingEdge() || buttonRecord.risingEdge()) { // FIX
if(buttonPlay.fallingEdge() || buttonRecord.fallingEdge()) {
playWav1.stop();
mode = Mode::Ready; print_mode();
return;
}
}
}
// All files have been played
mode = Mode::Ready; print_mode();
}
void playLastRecording() {
// Find the first available file number
uint16_t idx = 0;
for (uint16_t i=0; i<9999; i++) {
// Format the counter as a five-digit number with leading zeroes, followed by file extension
snprintf(filename, 11, " %05d.wav", i);
// check, if file with index i exists
if (!SD.exists(filename)) {
idx = i - 1;
break;
}
}
// now play file with index idx == last recorded file
snprintf(filename, 11, " %05d.wav", idx);
Serial.println(filename);
playWav1.play(filename);
mode = Mode::Playing; print_mode();
while (!playWav1.isStopped()) { // this works for playWav
buttonPlay.update();
buttonRecord.update();
// Button is pressed again
// if(buttonPlay.risingEdge() || buttonRecord.risingEdge()) { // FIX
if(buttonPlay.fallingEdge() || buttonRecord.risingEdge()) {
playWav1.stop();
mode = Mode::Ready; print_mode();
return;
}
}
// file has been played
mode = Mode::Ready; print_mode();
end_Beep();
}
// Retrieve the current time from Teensy built-in RTC
time_t getTeensy3Time(){
return Teensy3Clock.get();
}
// Callback to assign timestamps for file system operations
void dateTime(uint16_t* date, uint16_t* time, uint8_t* ms10) {
// Return date using FS_DATE macro to format fields.
*date = FS_DATE(year(), month(), day());
// Return time using FS_TIME macro to format fields.
*time = FS_TIME(hour(), minute(), second());
// Return low time bits in units of 10 ms.
*ms10 = second() & 1 ? 100 : 0;
}
// Non-blocking delay, which pauses execution of main program logic,
// but while still listening for input
void wait(unsigned int milliseconds) {
elapsedMillis msec=0;
while (msec <= milliseconds) {
buttonRecord.update();
buttonPlay.update();
if (buttonRecord.fallingEdge()) Serial.println("Button (pin 0) Press");
if (buttonPlay.fallingEdge()) Serial.println("Button (pin 1) Press");
if (buttonRecord.risingEdge()) Serial.println("Button (pin 0) Release");
if (buttonPlay.risingEdge()) Serial.println("Button (pin 1) Release");
}
}
void writeOutHeader() { // update WAV header with final filesize/datasize
// NumSamples = (recByteSaved*8)/bitsPerSample/numChannels;
// Subchunk2Size = NumSamples*numChannels*bitsPerSample/8; // number of samples x number of channels x number of bytes per sample
Subchunk2Size = recByteSaved - 42; // because we didn't make space for the header to start with! Lose 21 samples...
ChunkSize = Subchunk2Size + 34; // was 36;
frec.seek(0);
frec.write("RIFF");
byte1 = ChunkSize & 0xff;
byte2 = (ChunkSize >> 8) & 0xff;
byte3 = (ChunkSize >> 16) & 0xff;
byte4 = (ChunkSize >> 24) & 0xff;
frec.write(byte1); frec.write(byte2); frec.write(byte3); frec.write(byte4);
frec.write("WAVE");
frec.write("fmt ");
byte1 = Subchunk1Size & 0xff;
byte2 = (Subchunk1Size >> 8) & 0xff;
byte3 = (Subchunk1Size >> 16) & 0xff;
byte4 = (Subchunk1Size >> 24) & 0xff;
frec.write(byte1); frec.write(byte2); frec.write(byte3); frec.write(byte4);
byte1 = AudioFormat & 0xff;
byte2 = (AudioFormat >> 8) & 0xff;
frec.write(byte1); frec.write(byte2);
byte1 = numChannels & 0xff;
byte2 = (numChannels >> 8) & 0xff;
frec.write(byte1); frec.write(byte2);
byte1 = sampleRate & 0xff;
byte2 = (sampleRate >> 8) & 0xff;
byte3 = (sampleRate >> 16) & 0xff;
byte4 = (sampleRate >> 24) & 0xff;
frec.write(byte1); frec.write(byte2); frec.write(byte3); frec.write(byte4);
byte1 = byteRate & 0xff;
byte2 = (byteRate >> 8) & 0xff;
byte3 = (byteRate >> 16) & 0xff;
byte4 = (byteRate >> 24) & 0xff;
frec.write(byte1); frec.write(byte2); frec.write(byte3); frec.write(byte4);
byte1 = blockAlign & 0xff;
byte2 = (blockAlign >> 8) & 0xff;
frec.write(byte1); frec.write(byte2);
byte1 = bitsPerSample & 0xff;
byte2 = (bitsPerSample >> 8) & 0xff;
frec.write(byte1); frec.write(byte2);
frec.write("data");
byte1 = Subchunk2Size & 0xff;
byte2 = (Subchunk2Size >> 8) & 0xff;
byte3 = (Subchunk2Size >> 16) & 0xff;
byte4 = (Subchunk2Size >> 24) & 0xff;
frec.write(byte1); frec.write(byte2); frec.write(byte3); frec.write(byte4);
frec.close();
Serial.println("header written");
Serial.print("Subchunk2: ");
Serial.println(Subchunk2Size);
}
void end_Beep(void) {
waveform1.frequency(523.25);
waveform1.amplitude(beep_volume);
wait(250);
waveform1.amplitude(0);
wait(250);
waveform1.amplitude(beep_volume);
wait(250);
waveform1.amplitude(0);
wait(250);
waveform1.amplitude(beep_volume);
wait(250);
waveform1.amplitude(0);
wait(250);
waveform1.amplitude(beep_volume);
wait(250);
waveform1.amplitude(0);
}
void print_mode(void) { // only for debugging
Serial.print("Mode switched to: ");
// Initialising, Ready, Prompting, Recording, Playing
if(mode == Mode::Ready) Serial.println(" Ready");
else if(mode == Mode::Prompting) Serial.println(" Prompting");
else if(mode == Mode::Recording) Serial.println(" Recording");
else if(mode == Mode::Playing) Serial.println(" Playing");
else if(mode == Mode::Initialising) Serial.println(" Initialising");
else Serial.println(" Undefined");
}I get this error when compiling
Code:
C:\Program Files (x86)\Arduino\hardware\teensy\avr\libraries\MTP_Teensy\src\MTP_Teensy.cpp: In member function 'uint32_t MTP_class::GetObjectInfo(MTP_class::MTPContainer&)':carpracing
Well-known member
right here is my code i cannot get the greetings file to work get long bleep b4 recording then get 4 bleeps when I have hung up I can get playback the last message but cant get the greeting message to work at all helppppppppppppppp please
[/CODE]
Code:
[code]
/**
* Audio Guestbook, Copyright (c) 2022 Playful Technology
*
* Tested using a Teensy 4.0 with Teensy Audio Shield, although should work
* with minor modifications on other similar hardware
*
* When handset is lifted, a pre-recorded greeting message is played, followed by a tone.
* Then, recording starts, and continues until the handset is replaced.
* Playback button allows all messages currently saved on SD card through earpiece
*
* Files are saved on SD card as 44.1kHz, 16-bit, mono signed integer RAW audio format
* --> changed this to WAV recording, DD4WH 2022_07_31
* --> added MTP support, which enables copying WAV files from the SD card via the USB connection, DD4WH 2022_08_01
*
*
* Frank DD4WH, August 1st 2022
* for a DBP 611 telephone (closed contact when handheld is lifted) & with recording to WAV file
* contact for switch button 0 is closed when handheld is lifted
*
* GNU GPL v3.0 license
*
*/
#include <Bounce.h>
#include <Audio.h>
#include <Wire.h>
#include <SPI.h>
#include <SD.h>
#include <TimeLib.h>
#include <MTP_Teensy.h>
#include "play_sd_wav.h" // local copy with fixes
// DEFINES
// Define pins used by Teensy Audio Shield
#define SDCARD_CS_PIN 10
#define SDCARD_MOSI_PIN 7
#define SDCARD_SCK_PIN 14
// And those used for inputs
#define HOOK_PIN 0
#define PLAYBACK_BUTTON_PIN 1
#define noINSTRUMENT_SD_WRITE
// GLOBALS
// Audio initialisation code can be generated using the GUI interface at https://www.pjrc.com/teensy/gui/
// Inputs
AudioSynthWaveform waveform1; // To create the "beep" sfx
AudioInputI2S i2s2; // I2S input from microphone on audio shield
AudioPlaySdWav playWav1; // Play 44.1kHz 16-bit PCM greeting WAV file
AudioRecordQueue queue1; // Creating an audio buffer in memory before saving to SD
AudioMixer4 mixer; // Allows merging several inputs to same output
AudioOutputI2S i2s1; // I2S interface to Speaker/Line Out on Audio shield
AudioConnection patchCord1(waveform1, 0, mixer, 0); // wave to mixer
AudioConnection patchCord3(playWav1, 0, mixer, 1); // wav file playback mixer
AudioConnection patchCord4(mixer, 0, i2s1, 0); // mixer output to speaker (L)
AudioConnection patchCord6(mixer, 0, i2s1, 1); // mixer output to speaker (R)
AudioConnection patchCord5(i2s2, 0, queue1, 0); // mic input to queue (L)
AudioControlSGTL5000 sgtl5000_1;
// Filename to save audio recording on SD card
char filename[15];
// The file object itself
File frec;
// Use long 40ms debounce time on both switches
Bounce buttonRecord = Bounce(HOOK_PIN, 40);
Bounce buttonPlay = Bounce(PLAYBACK_BUTTON_PIN, 40);
// Keep track of current state of the device
enum Mode {Initialising, Ready, Prompting, Recording, Playing};
Mode mode = Mode::Initialising;
float beep_volume = 0.04f; // not too loud :-)
uint32_t MTPcheckInterval; // default value of device check interval [ms]
// variables for writing to WAV file
unsigned long ChunkSize = 0L;
unsigned long Subchunk1Size = 16;
unsigned int AudioFormat = 1;
unsigned int numChannels = 1;
unsigned long sampleRate = 44100;
unsigned int bitsPerSample = 16;
unsigned long byteRate = sampleRate*numChannels*(bitsPerSample/8);// samplerate x channels x (bitspersample / 8)
unsigned int blockAlign = numChannels*bitsPerSample/8;
unsigned long Subchunk2Size = 0L;
unsigned long recByteSaved = 0L;
unsigned long NumSamples = 0L;
byte byte1, byte2, byte3, byte4;
void setup() {
Serial.begin(9600);
while (!Serial && millis() < 5000) {
// wait for serial port to connect.
}
Serial.println("Serial set up correctly");
Serial.printf("Audio block set to %d samples\n",AUDIO_BLOCK_SAMPLES);
print_mode();
// Configure the input pins
pinMode(HOOK_PIN, INPUT_PULLUP);
pinMode(PLAYBACK_BUTTON_PIN, INPUT_PULLUP);
// Audio connections require memory, and the record queue
// uses this memory to buffer incoming audio.
AudioMemory(60);
// Enable the audio shield, select input, and enable output
sgtl5000_1.enable();
// Define which input on the audio shield to use (AUDIO_INPUT_LINEIN / AUDIO_INPUT_MIC)
sgtl5000_1.inputSelect(AUDIO_INPUT_MIC);
//sgtl5000_1.adcHighPassFilterDisable(); //
sgtl5000_1.volume(0.95);
mixer.gain(0, 1.0f);
mixer.gain(1, 1.0f);
// Play a beep to indicate system is online
waveform1.begin(beep_volume, 440, WAVEFORM_SINE);
wait(1000);
waveform1.amplitude(0);
delay(1000);
// Initialize the SD card
SPI.setMOSI(SDCARD_MOSI_PIN);
SPI.setSCK(SDCARD_SCK_PIN);
if (!(SD.begin(SDCARD_CS_PIN)))
{
// stop here if no SD card, but print a message
while (1) {
Serial.println("Unable to access the SD card");
delay(500);
}
}
else Serial.println("SD card correctly initialized");
// mandatory to begin the MTP session.
MTP.begin();
// Add SD Card
// MTP.addFilesystem(SD, "SD Card");
MTP.addFilesystem(SD, "Ian Audio guestbook"); // choose a nice name for the SD card volume to appear in your file explorer
Serial.println("Added SD card via MTP");
MTPcheckInterval = MTP.storage()->get_DeltaDeviceCheckTimeMS();
// Value in dB
// sgtl5000_1.micGain(80);
sgtl5000_1.micGain(23); // much lower gain is required for the AOM5024 electret capsule
// Synchronise the Time object used in the program code with the RTC time provider.
// See https://github.com/PaulStoffregen/Time
setSyncProvider(getTeensy3Time);
// Define a callback that will assign the correct datetime for any file system operations
// (i.e. saving a new audio recording onto the SD card)
FsDateTime::setCallback(dateTime);
mode = Mode::Ready; print_mode();
}
void loop() {
// First, read the buttons
buttonRecord.update();
buttonPlay.update();
switch(mode){
case Mode::Ready:
// Falling edge occurs when the handset is lifted --> 611 telephone
if (buttonRecord.fallingEdge()) {
Serial.println("Handset lifted");
mode = Mode::Prompting; print_mode();
}
else if(buttonPlay.fallingEdge()) {
//playAllRecordings();
playLastRecording();
}
break;
case Mode::Prompting:
// Wait a second for users to put the handset to their ear
wait(1000);
// Play the greeting inviting them to record their message
playWav1.play("greeting.wav");
// Wait until the message has finished playing
// while (playWav1.isPlaying()) {
while (!playWav1.isStopped()) {
// Check whether the handset is replaced
buttonRecord.update();
buttonPlay.update();
// Handset is replaced
if(buttonRecord.risingEdge()) {
playWav1.stop();
mode = Mode::Ready; print_mode();
return;
}
if(buttonPlay.fallingEdge()) {
playWav1.stop();
//playAllRecordings();
playLastRecording();
return;
}
}
// Debug message
Serial.println("Starting Recording");
// Play the tone sound effect
waveform1.begin(beep_volume, 725, WAVEFORM_SINE);
wait(1250);
waveform1.amplitude(0);
// Start the recording function
startRecording();
break;
case Mode::Recording:
// Handset is replaced
if(buttonRecord.risingEdge()){
// Debug log
Serial.println("Stopping Recording");
// Stop recording
stopRecording();
// Play audio tone to confirm recording has ended
end_Beep();
}
else {
continueRecording();
}
break;
case Mode::Playing: // to make compiler happy
break;
case Mode::Initialising: // to make compiler happy
break;
}
MTP.loop(); // This is mandatory to be placed in the loop code.
}
void setMTPdeviceChecks(bool nable)
{
if (nable)
{
MTP.storage()->set_DeltaDeviceCheckTimeMS(MTPcheckInterval);
Serial.print("En");
}
else
{
MTP.storage()->set_DeltaDeviceCheckTimeMS((uint32_t) -1);
Serial.print("Dis");
}
Serial.println("abled MTP storage device checks");
}
#if defined(INSTRUMENT_SD_WRITE)
static uint32_t worstSDwrite, printNext;
#endif // defined(INSTRUMENT_SD_WRITE)
void startRecording() {
setMTPdeviceChecks(false); // disable MTP device checks while recording
#if defined(INSTRUMENT_SD_WRITE)
worstSDwrite = 0;
printNext = 0;
#endif // defined(INSTRUMENT_SD_WRITE)
// Find the first available file number
// for (uint8_t i=0; i<9999; i++) { // BUGFIX uint8_t overflows if it reaches 255
for (uint16_t i=0; i<9999; i++) {
// Format the counter as a five-digit number with leading zeroes, followed by file extension
snprintf(filename, 11, " %05d.wav", i);
// Create if does not exist, do not open existing, write, sync after write
if (!SD.exists(filename)) {
break;
}
}
frec = SD.open(filename, FILE_WRITE);
Serial.println("Opened file !");
if(frec) {
Serial.print("Recording to ");
Serial.println(filename);
queue1.begin();
mode = Mode::Recording; print_mode();
recByteSaved = 0L;
}
else {
Serial.println("Couldn't open file to record!");
}
}
void continueRecording() {
#if defined(INSTRUMENT_SD_WRITE)
uint32_t started = micros();
#endif // defined(INSTRUMENT_SD_WRITE)
#define NBLOX 16
// Check if there is data in the queue
if (queue1.available() >= NBLOX) {
byte buffer[NBLOX*AUDIO_BLOCK_SAMPLES*sizeof(int16_t)];
// Fetch 2 blocks from the audio library and copy
// into a 512 byte buffer. The Arduino SD library
// is most efficient when full 512 byte sector size
// writes are used.
for (int i=0;i<NBLOX;i++)
{
memcpy(buffer+i*AUDIO_BLOCK_SAMPLES*sizeof(int16_t), queue1.readBuffer(), AUDIO_BLOCK_SAMPLES*sizeof(int16_t));
queue1.freeBuffer();
}
// Write all 512 bytes to the SD card
frec.write(buffer, sizeof buffer);
recByteSaved += sizeof buffer;
}
#if defined(INSTRUMENT_SD_WRITE)
started = micros() - started;
if (started > worstSDwrite)
worstSDwrite = started;
if (millis() >= printNext)
{
Serial.printf("Worst write took %luus\n",worstSDwrite);
worstSDwrite = 0;
printNext = millis()+250;
}
#endif // defined(INSTRUMENT_SD_WRITE)
}
void stopRecording() {
// Stop adding any new data to the queue
queue1.end();
// Flush all existing remaining data from the queue
while (queue1.available() > 0) {
// Save to open file
frec.write((byte*)queue1.readBuffer(), AUDIO_BLOCK_SAMPLES*sizeof(int16_t));
queue1.freeBuffer();
recByteSaved += AUDIO_BLOCK_SAMPLES*sizeof(int16_t);
}
writeOutHeader();
// Close the file
frec.close();
Serial.println("Closed file");
mode = Mode::Ready; print_mode();
setMTPdeviceChecks(true); // enable MTP device checks, recording is finished
}
void playAllRecordings() {
// Recording files are saved in the root directory
File dir = SD.open("/");
while (true) {
File entry = dir.openNextFile();
if (strstr(entry.name(), "greeting"))
{
entry = dir.openNextFile();
}
if (!entry) {
// no more files
entry.close();
end_Beep();
break;
}
//int8_t len = strlen(entry.name()) - 4;
// if (strstr(strlwr(entry.name() + (len - 4)), ".raw")) {
// if (strstr(strlwr(entry.name() + (len - 4)), ".wav")) {
// the lines above throw a warning, so I replace them with this (which is also easier to read):
if (strstr(entry.name(), ".wav") || strstr(entry.name(), ".WAV")) {
Serial.print("Now playing ");
Serial.println(entry.name());
// Play a short beep before each message
waveform1.amplitude(beep_volume);
wait(750);
waveform1.amplitude(0);
// Play the file
playWav1.play(entry.name());
mode = Mode::Playing; print_mode();
}
entry.close();
// while (playWav1.isPlaying()) { // strangely enough, this works for playRaw, but it does not work properly for playWav
while (!playWav1.isStopped()) { // this works for playWav
buttonPlay.update();
buttonRecord.update();
// Button is pressed again
// if(buttonPlay.risingEdge() || buttonRecord.risingEdge()) { // FIX
if(buttonPlay.fallingEdge() || buttonRecord.risingEdge()) {
playWav1.stop();
mode = Mode::Ready; print_mode();
return;
}
}
}
// All files have been played
mode = Mode::Ready; print_mode();
}
void playLastRecording() {
// Find the first available file number
uint16_t idx = 0;
for (uint16_t i=0; i<9999; i++) {
// Format the counter as a five-digit number with leading zeroes, followed by file extension
snprintf(filename, 11, " %05d.wav", i);
// check, if file with index i exists
if (!SD.exists(filename)) {
idx = i - 1;
break;
}
}
// now play file with index idx == last recorded file
snprintf(filename, 11, " %05d.wav", idx);
Serial.println(filename);
playWav1.play(filename);
mode = Mode::Playing; print_mode();
while (!playWav1.isStopped()) { // this works for playWav
buttonPlay.update();
buttonRecord.update();
// Button is pressed again
// if(buttonPlay.risingEdge() || buttonRecord.risingEdge()) { // FIX
if(buttonPlay.fallingEdge() || buttonRecord.risingEdge()) {
playWav1.stop();
mode = Mode::Ready; print_mode();
return;
}
}
// file has been played
mode = Mode::Ready; print_mode();
end_Beep();
}
// Retrieve the current time from Teensy built-in RTC
time_t getTeensy3Time(){
return Teensy3Clock.get();
}
// Callback to assign timestamps for file system operations
void dateTime(uint16_t* date, uint16_t* time, uint8_t* ms10) {
// Return date using FS_DATE macro to format fields.
*date = FS_DATE(year(), month(), day());
// Return time using FS_TIME macro to format fields.
*time = FS_TIME(hour(), minute(), second());
// Return low time bits in units of 10 ms.
*ms10 = second() & 1 ? 100 : 0;
}
// Non-blocking delay, which pauses execution of main program logic,
// but while still listening for input
void wait(unsigned int milliseconds) {
elapsedMillis msec=0;
while (msec <= milliseconds) {
buttonRecord.update();
buttonPlay.update();
if (buttonRecord.fallingEdge()) Serial.println("Button (pin 0) Press");
if (buttonPlay.fallingEdge()) Serial.println("Button (pin 1) Press");
if (buttonRecord.risingEdge()) Serial.println("Button (pin 0) Release");
if (buttonPlay.risingEdge()) Serial.println("Button (pin 1) Release");
}
}
void writeOutHeader() { // update WAV header with final filesize/datasize
// NumSamples = (recByteSaved*8)/bitsPerSample/numChannels;
// Subchunk2Size = NumSamples*numChannels*bitsPerSample/8; // number of samples x number of channels x number of bytes per sample
Subchunk2Size = recByteSaved - 42; // because we didn't make space for the header to start with! Lose 21 samples...
ChunkSize = Subchunk2Size + 34; // was 36;
frec.seek(0);
frec.write("RIFF");
byte1 = ChunkSize & 0xff;
byte2 = (ChunkSize >> 8) & 0xff;
byte3 = (ChunkSize >> 16) & 0xff;
byte4 = (ChunkSize >> 24) & 0xff;
frec.write(byte1); frec.write(byte2); frec.write(byte3); frec.write(byte4);
frec.write("WAVE");
frec.write("fmt ");
byte1 = Subchunk1Size & 0xff;
byte2 = (Subchunk1Size >> 8) & 0xff;
byte3 = (Subchunk1Size >> 16) & 0xff;
byte4 = (Subchunk1Size >> 24) & 0xff;
frec.write(byte1); frec.write(byte2); frec.write(byte3); frec.write(byte4);
byte1 = AudioFormat & 0xff;
byte2 = (AudioFormat >> 8) & 0xff;
frec.write(byte1); frec.write(byte2);
byte1 = numChannels & 0xff;
byte2 = (numChannels >> 8) & 0xff;
frec.write(byte1); frec.write(byte2);
byte1 = sampleRate & 0xff;
byte2 = (sampleRate >> 8) & 0xff;
byte3 = (sampleRate >> 16) & 0xff;
byte4 = (sampleRate >> 24) & 0xff;
frec.write(byte1); frec.write(byte2); frec.write(byte3); frec.write(byte4);
byte1 = byteRate & 0xff;
byte2 = (byteRate >> 8) & 0xff;
byte3 = (byteRate >> 16) & 0xff;
byte4 = (byteRate >> 24) & 0xff;
frec.write(byte1); frec.write(byte2); frec.write(byte3); frec.write(byte4);
byte1 = blockAlign & 0xff;
byte2 = (blockAlign >> 8) & 0xff;
frec.write(byte1); frec.write(byte2);
byte1 = bitsPerSample & 0xff;
byte2 = (bitsPerSample >> 8) & 0xff;
frec.write(byte1); frec.write(byte2);
frec.write("data");
byte1 = Subchunk2Size & 0xff;
byte2 = (Subchunk2Size >> 8) & 0xff;
byte3 = (Subchunk2Size >> 16) & 0xff;
byte4 = (Subchunk2Size >> 24) & 0xff;
frec.write(byte1); frec.write(byte2); frec.write(byte3); frec.write(byte4);
frec.close();
Serial.println("header written");
Serial.print("Subchunk2: ");
Serial.println(Subchunk2Size);
}
void end_Beep(void) {
waveform1.frequency(525.25);
waveform1.amplitude(beep_volume);
wait(250);
waveform1.amplitude(0);
wait(250);
waveform1.amplitude(beep_volume);
wait(250);
waveform1.amplitude(0);
wait(250);
waveform1.amplitude(beep_volume);
wait(250);
waveform1.amplitude(0);
wait(250);
waveform1.amplitude(beep_volume);
wait(250);
waveform1.amplitude(0);
}
void print_mode(void) { // only for debugging
Serial.print("Mode switched to: ");
// Initialising, Ready, Prompting, Recording, Playing
if(mode == Mode::Ready) Serial.println(" Ready");
else if(mode == Mode::Prompting) Serial.println(" Prompting");
else if(mode == Mode::Recording) Serial.println(" Recording");
else if(mode == Mode::Playing) Serial.println(" Playing");
else if(mode == Mode::Initialising) Serial.println(" Initialising");
else Serial.println(" Undefined");
}Hi,
i could compile the code and it seems all is working fine with just 2 issues.
1. The greeting message is very quiet and nearly immpossible to hear. Increasing the gain doesnt help and it seems that nothing is changing.
2. The recording message is just a buzzing sound. I still use the in-build microphone of the telephone. So i dont know if the microphone is still working, which i guess it isnt since the seriell monitor says everything ist fine.
My idea was to buy the AOM-5024L-HD-R microphone capsule here and replace it with the original capsule of the telephon:
https://www.digikey.de/en/products/...N4IgTCBcDaIIIHkCyBaArABjAFgDIoAkARFAJRAF0BfIA
But what i dont know is which speaker capsule i can use. Is one of these possible to use or which on do i need?
a) https://www.digikey.de/en/products/detail/cui-devices/CLS0281-L152/1630876
b) https://www.digikey.de/en/products/detail/cui-devices/CVS-3108/2791831
Thanks for you help. I could get (nearly) everything done thanks to this thread
i could compile the code and it seems all is working fine with just 2 issues.
1. The greeting message is very quiet and nearly immpossible to hear. Increasing the gain doesnt help and it seems that nothing is changing.
2. The recording message is just a buzzing sound. I still use the in-build microphone of the telephone. So i dont know if the microphone is still working, which i guess it isnt since the seriell monitor says everything ist fine.
My idea was to buy the AOM-5024L-HD-R microphone capsule here and replace it with the original capsule of the telephon:
https://www.digikey.de/en/products/...N4IgTCBcDaIIIHkCyBaArABjAFgDIoAkARFAJRAF0BfIA
But what i dont know is which speaker capsule i can use. Is one of these possible to use or which on do i need?
a) https://www.digikey.de/en/products/detail/cui-devices/CLS0281-L152/1630876
b) https://www.digikey.de/en/products/detail/cui-devices/CVS-3108/2791831
Thanks for you help. I could get (nearly) everything done thanks to this thread
I got this issue and I resolve it by comment out this line : AudioConnection patchCord6(mixer, 0, i2s1, 1); // mixer output to speaker (R)
Also, be sure you use a Stereo or Mono cable. If you are using a stereo cable, you need to comment out the "speaker (r)" line.
How to use Teensyduino libraries
So it appears you are much further than me and I just have one simple question as of now, How do I use the teensyduino libraries that were installed with the teensyduino installer? I am using Arduino iDE 2.0, i added the installer link and goit that all installed and I can target the teensy boards, but I cant seem to figure out how to use the libraries for the teensy and not the regular arduino ones as some have some modifications, does it just automatically use he correct libraries when you are targeting the teensy board through the tool menu? Any and all help would be greatly appreciated!!!!
So it appears you are much further than me and I just have one simple question as of now, How do I use the teensyduino libraries that were installed with the teensyduino installer? I am using Arduino iDE 2.0, i added the installer link and goit that all installed and I can target the teensy boards, but I cant seem to figure out how to use the libraries for the teensy and not the regular arduino ones as some have some modifications, does it just automatically use he correct libraries when you are targeting the teensy board through the tool menu? Any and all help would be greatly appreciated!!!!
anyone have any idea's on my power issue? throughout this whole thread people were saying never use it plugged into a computer. always a power source for best recording. however, i find my best results/ functionality when plugged into a computer. my issue was that when plugged into the computer, everything works perfect! plugged into a power source, when i hit the playback button while the greeting is playing, it plays the last recorded message, and beeps, but when i hang up, it plays the greeting again as if the handset was lifted again, instead of being hung up. if i don't use the playback button, everything is working fine so i'm going to just leave it as is.
another question i have is: if i pick up the phone and listen to the greeting and decide i don't want to leave a message and hang up before the beep, it doesn't reset back to ready. instead, it just replays the greeting again. any idea on how to fix that?
Thanks!
another question i have is: if i pick up the phone and listen to the greeting and decide i don't want to leave a message and hang up before the beep, it doesn't reset back to ready. instead, it just replays the greeting again. any idea on how to fix that?
Thanks!
Hello guys,
i do have a little problem... I did build and program everything like in the instructions and also included the newer versions of the code. If I pick up the phone nothing is played via speaker. I even did measure the voltage at the speaker but it doesn't change...
Then it records a message and saves it correctly to the sd card, but the audio is not recorded so it's a flat line.
Does anyone know, what I'm doing wrong?
Thanks a lot in advance!
i do have a little problem... I did build and program everything like in the instructions and also included the newer versions of the code. If I pick up the phone nothing is played via speaker. I even did measure the voltage at the speaker but it doesn't change...
Then it records a message and saves it correctly to the sd card, but the audio is not recorded so it's a flat line.
Does anyone know, what I'm doing wrong?
Thanks a lot in advance!
sounds to me like your speaker and mic aren't wired correctly. are you sure you have the right audio shield for your teensy board?
Are you sure that there is absolutely no message coming from the speaker or is it just veeeeeeeery quiet?
I used the breakout board for the speaker and aux-cable (tip/sleeve) like in the original wiring and the messsage was nearly impossible to hear. When i connected the telephone speaker directly to the Audioboard (L/GND), everything was working fine and the message was loud and clear. Maybe try that?
I used the breakout board for the speaker and aux-cable (tip/sleeve) like in the original wiring and the messsage was nearly impossible to hear. When i connected the telephone speaker directly to the Audioboard (L/GND), everything was working fine and the message was loud and clear. Maybe try that?
Crack/Clicking sound while speaking
I'm getting an issue in my voice recording where there is a cracking/clicking sound while i speak. The louder i speak the louder the clicking is. It's not there if i'm not speaking. Even when the gain is cranked down, the clicking is still there. The clicking was there when i was using the original carbon mic. I replaced the mic with an electret mic and i'm getting the same issue. Does anyone have an idea on what could cause this? Would it be in the code or hardware? Can the original mic cables be an issue?
I'm getting an issue in my voice recording where there is a cracking/clicking sound while i speak. The louder i speak the louder the clicking is. It's not there if i'm not speaking. Even when the gain is cranked down, the clicking is still there. The clicking was there when i was using the original carbon mic. I replaced the mic with an electret mic and i'm getting the same issue. Does anyone have an idea on what could cause this? Would it be in the code or hardware? Can the original mic cables be an issue?
Code
100% a code issue, I have this same problem and solved it by disabling MTP while recording.
100% a code issue, I have this same problem and solved it by disabling MTP while recording.
Thanks, this solved it! I am now though getting an issue with constant audio clicking in my headset speaker. As soon as i turn it on the clicking isn't there. But as soon as i activate the voice message greeting by picking up the phone, the clicking starts and remains there. Seems like when this code gets initiated, it activates the clicking for some reason? I am using the most recent code uploaded on his github account.
if (buttonRecord.risingEdge()) {
Serial.println("Handset lifted");
mode = Mode:rompting; print_mode();
if (buttonRecord.risingEdge()) {
Serial.println("Handset lifted");
mode = Mode:
rompting; print_mode();Hi guys, I am having troubles with this. Sometimes, it works correctly, sometimes it doesn't.
When it's not working, is like the handset switch isn't responding correctly and the follwing prints in the serial monitor all while holding the phone is on the handset, with no change in switch status.
This also all appeared within about 5 seconds.
Any advice?
When it's not working, is like the handset switch isn't responding correctly and the follwing prints in the serial monitor all while holding the phone is on the handset, with no change in switch status.
This also all appeared within about 5 seconds.
Any advice?
Hi all,
i a complete newby into this topic, but i want to get it working. I currently struggle to get the hardware. The audio shield for teensy 4.1 is not available in my region. I purchased now the teensy 4.1 and the adafruit music maker, hoping this will work with "just" minor tweaks to the code. So here is my question:
- will this hardware combination work?
- i assume i need to incorporate the adafruit library in the include section, correct?
- anything else to consider?
hope i will find some support here. Will share my code once i have done my first steps. If there is anybody out there willing to support and give guidance it would be awesome.
Thanks
BR
Stefan
i a complete newby into this topic, but i want to get it working. I currently struggle to get the hardware. The audio shield for teensy 4.1 is not available in my region. I purchased now the teensy 4.1 and the adafruit music maker, hoping this will work with "just" minor tweaks to the code. So here is my question:
- will this hardware combination work?
- i assume i need to incorporate the adafruit library in the include section, correct?
- anything else to consider?
hope i will find some support here. Will share my code once i have done my first steps. If there is anybody out there willing to support and give guidance it would be awesome.
Thanks
BR
Stefan