Hi guys, for my project I need to use both the ESP32's Bluetooth and the .mp3 files on my micro SD to play them.
I use a MAX98357A, a mini SD module (3.3V - CS - MOSI -CLK - MISO -GND)
I don't need it to play at the same time but I do need the bluetooth to always be connected to the esp32 to play a sound and on the other hand when I press certain buttons it plays the audios saved on the SD.
My problem is that it causes interference when using the same I2S channel, in the same code it does not do both things, for example: it plays from the SD and it appears that I can connect the bluetooth but it does not allow me.
I also tried using 2 amplifiers, 1 for SD and one for bluetooth but still only one works.
I don't know if anyone else has this problem and has been able to solve it, can you please help me, I attached code; (at the moment do not implement the buttons in this code, just play the same audio /vaca.mp3)
// Include required libraries
#include "Arduino.h"
#include "Audio.h"
#include "SD.h"
#include "FS.h"
#include "BluetoothA2DPSink.h"
// microSD Card Reader connections
#define SD_CS 5
#define SPI_MOSI 23
#define SPI_MISO 19
#define SPI_SCK 18
// I2S Connections MAX98357A
#define I2S_DOUT 25
#define I2S_BCLK 26
#define I2S_LRC 27
// Create Audio and Bluetooth objects
Audio audio;
BluetoothA2DPSink bluetooth;
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(30);
// Open music file
audio.connecttoFS(SD, "/vaca.mp3");
// Start Bluetooth
i2s_pin_config_t configBT = {
.mck_io_num = I2S_PIN_NO_CHANGE,
.bck_io_num = I2S_BCLK,
.ws_io_num = I2S_LRC,
.data_out_num = I2S_DOUT,
.data_in_num = I2S_PIN_NO_CHANGE
};
bluetooth.set_pin_config(configBT);
bluetooth.start("ESP32_Audio");
}
void loop() {
audio.loop();
}