ESP32 How to play multiple audio files from SD

Projects General Guidance
1

Hi,

I want to play multiple audio files from an SD card with an ESP32.
I am using esp32-i2s-sd-player library, it works as is below with one file but I cant work out how to play multiple files one after another.

Can anyone put me on the correct path to do this please?

Thanks

/*
  ESP32 SD I2S Music Player
  esp32-i2s-sd-player.ino
  Plays MP3 file from microSD card
  Uses MAX98357 I2S Amplifier Module
  Uses ESP32-audioI2S Library - https://github.com/schreibfaul1/ESP32-audioI2S
  * 
  DroneBot Workshop 2022
  https://dronebotworkshop.com
*/

// Include required libraries
#include "Arduino.h"
#include "Audio.h"
#include "SD.h"
#include "FS.h"
 
// microSD Card Reader connections
#define SD_CS          5
#define SPI_MOSI      23 
#define SPI_MISO      19
#define SPI_SCK       18
 
// I2S Connections
#define I2S_DOUT      26 // 22
#define I2S_BCLK      27 // 26
#define I2S_LRC       25
 
 // Create Audio object
Audio audio;
 
void setup() {
    
    // Set microSD Card CS as OUTPUT and set HIGH
    pinMode(SD_CS, OUTPUT);      
    digitalWrite(SD_CS, HIGH); 
    
    // Initialize SPI bus for microSD Card
    SPI.begin(SPI_SCK, SPI_MISO, SPI_MOSI);
    
    // Start Serial Port
    Serial.begin(115200);
    
    // Start microSD Card
    if(!SD.begin(SD_CS))
    {
      Serial.println("Error accessing microSD card!");
      while(true); 
    }
    
    // Setup I2S 
    audio.setPinout(I2S_BCLK, I2S_LRC, I2S_DOUT);
    
    // Set Volume
    audio.setVolume(15);
    
    // Open music file
    audio.connecttoFS(SD,"/charging.mp3");
        
    
 
    
}
 
void loop()
{
    audio.loop();    
}
2

Read the last line in setup. That looks like selecting the first tune. You need to continu opening the following files and then play them, one by one.

3

I mean, I want to call different audio files from the main loop, to start with just several audio files cycling but later with logic tests of a push button, all it says is the following.
How do I code actual different audio files as that seems to be hard coded in setup which is one file only.

void loop()
{
audio.loop();
}

4

like putting words such as "esp32 play mp3" gets results like

which has stuff like "Switch songs:" which may hold the answer or not.

5

I have tried that one before and it gives me compile errors...
They seem to just use the audio.connecttoFS(SD,"/xxx.mp3"); command but when i try that i get silence?

/*
  ESP32 SD I2S Music Player
  esp32-i2s-sd-player.ino
  Plays MP3 file from microSD card
  Uses MAX98357 I2S Amplifier Module
  Uses ESP32-audioI2S Library - https://github.com/schreibfaul1/ESP32-audioI2S
  * 
  DroneBot Workshop 2022
  https://dronebotworkshop.com
*/

// Include required libraries
#include "Arduino.h"
#include "Audio.h"
#include "SD.h"
#include "FS.h"
 
// microSD Card Reader connections
#define SD_CS          5
#define SPI_MOSI      23 
#define SPI_MISO      19
#define SPI_SCK       18
 
// I2S Connections
#define I2S_DOUT      26 // 22
#define I2S_BCLK      27 // 26
#define I2S_LRC       25
 
 // Create Audio object
Audio audio;
 
void setup() {
    
    // Set microSD Card CS as OUTPUT and set HIGH
    pinMode(SD_CS, OUTPUT);      
    digitalWrite(SD_CS, HIGH); 
    
    // Initialize SPI bus for microSD Card
    SPI.begin(SPI_SCK, SPI_MISO, SPI_MOSI);
    
    // Start Serial Port
    Serial.begin(115200);
    
    // Start microSD Card
    if(!SD.begin(SD_CS))
    {
      Serial.println("Error accessing microSD card!");
      while(true); 
    }
    
    // Setup I2S 
    audio.setPinout(I2S_BCLK, I2S_LRC, I2S_DOUT);
    
    // Set Volume
    audio.setVolume(15);
    
    // Open music file
   // audio.connecttoFS(SD,"/charging.mp3");
        
    
 
    
}
 
void loop()
{
    //audio.loop();
    audio.connecttoFS(SD,"/charging.mp3");  
    delay (5000);
    audio.connecttoFS(SD,"/fire-full_power.mp3"); 
    delay (5000);
}
6

What is the best way to play two audio clips triggered by button 1 & button 2?
I know I need to use an SD card as not enough mem to use encoded method.
Ideally using an ESP32, I already tried the ESP32-audioI2S Library but cant work out how to do it, previous support posts havent helped.

Are there any other methods?
Seems like something which shouldnt be this hard.

7

Did you try an example sketch that came with the library? It is best to start from there and then add the buttons...

8

It will be better continue that thread rather than start new one....

9

Yes, that works fine but there a no examples to play specific audio files on demand

10

Responses dried up.
Not really sure what to do, thats why started wondering if there is another way to do it?

11

Are you sure??
Playing a single file is an example of selecting a specific file on demand.

Also the TalkingClock example may be useful for you.

12

All the single file examples play it in setup()
This is where I got stuck.
When I try to play from main loop I just cant get anything to work....

Here is the single file example that works

//**********************************************************************************************************
//*    audioI2S-- I2S audiodecoder for ESP32,                                                              *
//**********************************************************************************************************
//
// first release on 11/2018
// Version 3  , Jul.02/2020
//
//
// THE SOFTWARE IS PROVIDED "AS IS" FOR PRIVATE USE ONLY, IT IS NOT FOR COMMERCIAL USE IN WHOLE OR PART OR CONCEPT.
// FOR PERSONAL USE IT IS SUPPLIED WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE
// WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHOR
// OR COPYRIGHT HOLDER BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE
//

#include "Arduino.h"
#include "WiFiMulti.h"
#include "Audio.h"
#include "SPI.h"
#include "SD.h"
#include "FS.h"

// Digital I/O used
#define SD_CS          5
#define SPI_MOSI      23
#define SPI_MISO      19
#define SPI_SCK       18
#define I2S_DOUT      26
#define I2S_BCLK      27
#define I2S_LRC       25



Audio audio;



void setup() {
    pinMode(SD_CS, OUTPUT);      digitalWrite(SD_CS, HIGH);
    SPI.begin(SPI_SCK, SPI_MISO, SPI_MOSI);
    SPI.setFrequency(1000000);
    Serial.begin(115200);
    SD.begin(SD_CS);
 
    audio.setPinout(I2S_BCLK, I2S_LRC, I2S_DOUT);
    audio.setVolume(15); // 0...21

    audio.connecttoFS(SD, "/test1.mp3");    
    

}

void loop()
{
   
    audio.loop();


}

But when I place the audio.connecttoFS(SD, "/test1.mp3"); in the main loop just as a test I get nothing...

13

The correct choice in such circumstances is to continue your effort then post updates about your progress.

Or, ask a moderator to move the thread to another section.

Creating a third thread is not the correct choice. I will not warn you again: do not cross-post.

14

I am pulling my hair out, I cant see why the code below does not work, i just get silence...
I just want to play two audio files one after another.
I know wiring is correct as single audio files can be played when audio.connecttoFS(SD, "charging.mp3"); is placed in setup but won't work when called from main loop.

I have tried many demo's & sample code and none of them work for me but all seem to do it as I have coded.

/*
  ESP32 SD I2S 
  Plays MP3 file from microSD card
  Uses MAX98357 I2S Amplifier Module
  Uses ESP32-audioI2S Library - https://github.com/schreibfaul1/ESP32-audioI2S
*/

// Include required libraries
#include "Arduino.h"
#include "Audio.h"
#include "SD.h"
#include "FS.h"
 
// microSD Card Reader connections
#define SD_CS          5
#define SPI_MOSI      23 
#define SPI_MISO      19
#define SPI_SCK       18
 
// I2S Connections
#define I2S_DOUT      26
#define I2S_BCLK      27 
#define I2S_LRC       25
 



 // Create Audio object
Audio audio;
 
void setup() {
    
    // Set microSD Card CS as OUTPUT and set HIGH
    pinMode(SD_CS, OUTPUT);      
    digitalWrite(SD_CS, HIGH); 
    
    // Initialize SPI bus for microSD Card
    SPI.begin(SPI_SCK, SPI_MISO, SPI_MOSI);
    
    // Start Serial Port
    Serial.begin(115200);
    
    // Start microSD Card
    if(!SD.begin(SD_CS))
    {
      Serial.println("Error accessing microSD card!");
      while(true); 
    }
    
    // Setup I2S 
    audio.setPinout(I2S_BCLK, I2S_LRC, I2S_DOUT);
    
    
}
 
void loop()
{
 
    audio.setVolume(15);
    audio.connecttoFS(SD, "charging.mp3");
    delay (10000);
    audio.connecttoFS(SD, "fire-full_power.mp3");
}
15

the words "esp32 play multiple audio" in an internet search engine did not help?

16

No...
That one also just plays silence, I dont understand what I am doing wrong.

17

Threads merged.

18

It is wrong way.
For playing audio the code must continuously fire audio.loop(); method in the loop(). You can't use long delays in your code.

19

You need to put filenames in an array.
Then put audio.loop(); in loop.
It needs to be continuously, so you will need non blocking code.
In the loop you can set a timer or you can test for end of audio file or you can read some button. Depending on that, you can set another audio file from your array. Read about non blocking code...
The timer cannot use delay! That is blocking code.... Timer might be unhandy as songs will have different length. I guess your library has some test for end of audio file. Maybe audio.loop returns false at end of file?

20

One of the first tests I tried is below but gives silence

void loop()
{
   
    	audio.loop();
	audio.connecttoFS(SD, "/test1.mp3");   

}