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Sound Solution with 3rd Party ES8388 Audio Breakout Board

The Sound Sensor module records the sounds of heartbeats and the lungs. The sensor (electret microphone) is connected to a stethoscope tube, so the user can mimic the functionalities of an "analog" stethoscope.

This solution is likely not functional because the PCB Artist Board does not implement a low pass filter on the I2C data lines. Once I2S is started and transferring data the noise on the I2C is too large to function properly and other boards solve this issue with a low pass filter on I2C data and clock lines.

Schematic

Elcret Microphone

Enter Amazon source here

ES8388 PCB Artist Audio Board

Here we describe the connection between the PCB Artist baord with the EPS32 S3 and the corresponding settings in the AudioTools library.

ES8388

Name ESP32 S3 ES8388 ES8388 ESP32 S3 Name Frequency (max)
RO NC ROUT DOU 37/MI D OUT
LO NC LOUT LRCLK A5/8 WS/Word CLK 200 kHz
GND NC GND DIN 35/MO D IN
GND GND GND SCLK 36/SC Bit CLK 26MHz
3.3 3.3 V AVDD DVDD 3.3 V 3.3 V
GND NC GND MCLK A4/14 Master CLK 51.2MHz
RI NC RIN2 GND NC GND
LI NC LIN2 SCL 4 SCL 400Khz
RI NC RIN1 SDA 3 SDA
MIC NC LIN1/MIC GND NC GND

$MIC_1$ is connected to MIC. $MIC_2$ is connected to RI. R/LO are routed. R/LI are routed.

Adafruit Feather ESP32 S3

Audio Driver Setup

#include "AudioTools.h"
#include "AudioLibs/I2SCodecStream.h"

// I2C
#define SDAPIN               3
#define SCLPIN               4
#define I2CSPEED        100000
#define ES8388ADDR        0x10

// I2S
#define MCLKPIN             14
#define BCLKPIN             36
#define WSPIN                8
#define DOPIN               37
#define DIPIN               35

AudioInfo                     audio_info(44200, 2, 16);
SineWaveGenerator<int16_t>    sine_wave(32000);
GeneratedSoundStream<int16_t> sound_stream(sine_wave);
DriverPins                    my_pins;
AudioBoard                    audio_board(AudioDriverES8388, my_pins);
I2SCodecStream                i2s_out_stream(audio_board);
StreamCopy                    copier(i2s_out_stream, sound_stream);
TwoWire                       myWire = TwoWire(0);

void setup() {

  Serial.begin(115200);
  AudioLogger::instance().begin(Serial, AudioLogger::Warning);
  LOGLEVEL_AUDIODRIVER = AudioDriverWarning;
  delay(2000);

  Serial.println("Setup starting...");

  my_pins.addI2C(PinFunction::CODEC, SCLPIN, SDAPIN, ES8388ADDR, I2CSPEED, myWire);
  my_pins.addI2S(PinFunction::CODEC, MCLKPIN, BCLKPIN, WSPIN, DOPIN, DIPIN);

  my_pins.begin();
  audio_board.begin();
  auto i2s_config = i2s_out_stream.defaultConfig();
  i2s_config.copyFrom(audio_info);  
  i2s_out_stream.begin(i2s_config);
  sine_wave.begin(audio_info, N_B4); // 493.88 Hz

  Serial.println("Setup completed ...");
}

// Arduino loop - copy sound to out
void loop() { copier.copy(); }