Hi Phil,

I installed both libraries but I have 2 questions:

1. Which board should I select in the Arduino to compile the code? I have an ESP32 Audio Kit V2.2 2957.
2. Do I need to add the line " #define AUDIOKIT_BOARD 1 " to the example you suggested?

Thank you.

The wiki of the audiokit project contains the list of supported frequencies!

Hello, everyone!

I'm working on a VoIP/intercom project using the ESP32 Audio Kit V2.2 (with ES8388 codec), and I'm facing a very specific issue. ✅ What works:
I can send audio from my PC microphone via TCP socket to the ESP32's audio output (speakers) without any problem.
Wi-Fi connection is stable and working.
I'm using bidirectional TCP, with a main.cpp sketch using Arduino framework, and two Python scripts on the PC (mic_to_esp32.py and esp32_to_speaker.py).
Sending audio from PC to ESP32 is clear and clean.
❌ The problem:
The ESP32 does not send any audio from its onboard microphone to the PC.
Port 5001 (which should send audio from ESP32 to PC) connects, but no sound is transmitted.
I'm using AUDIO_HAL_ADC_INPUT_LINE1 as input device.
I’ve tried with onboard mic and also external mic on LINE IN.
The code compiles fine, no runtime errors, just silence.
🧠 AudioKit Config:

cpp
CopiarEditar
auto cfg = kit.defaultConfig(RXTX_MODE); cfg.input_device = AUDIO_HAL_ADC_INPUT_LINE1; cfg.sample_rate = 16000; cfg.channels = 1; kit.begin(cfg); kit.setVolume(100); ❓ My questions:
What am I missing to make the built-in microphone or LINE1 input of the ESP32 Audio Kit V2.2 work and transmit audio to the PC?
Has anyone succeeded in creating a working full-duplex VoIP project with this board?
Should I move to ESP-ADF instead of Arduino Framework?

Any help, hints or working examples would be greatly appreciated 🙏

Thank you in advance!

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#include
#include "AudioTools.h"
#include "AudioLibs/AudioKit.h"
// ======= CONFIGS =======
const char* ssid = "Pandora";
const char* password = "vini5701";
const int port_in = 5000; // Entrada de áudio (fala do PC pro ESP32)
const int port_out = 5001; // Saída de áudio (fala do ESP32 pro PC)
WiFiServer serverIn(port_in);
WiFiServer serverOut(port_out);
AudioKitStream kit;
StreamCopy copierIn;
StreamCopy copierOut;
// ======== TASKS =========
void taskAudioIn(void* param) {
WiFiClient* client = (WiFiClient*)param;
copierIn.begin(kit, client);
while (client->connected()) {
copierIn.copy();
delay(1);
}
client->stop();
delete client;
vTaskDelete(NULL);
}
void taskAudioOut(void param) {
WiFiClient* client = (WiFiClient*)param;
copierOut.begin(*client, kit);
while (client->connected()) {
copierOut.copy();
delay(1);
}
client->stop();
delete client;
vTaskDelete(NULL);
}
void setup() {
Serial.begin(115200);
AudioLogger::instance().begin(Serial, AudioLogger::Info);
// Wi-Fi
Serial.println("Conectando ao Wi-Fi...");
WiFi.begin(ssid, password);
while (WiFi.status() != WL_CONNECTED) {
delay(500);
Serial.print(".");
}
Serial.println("\n✅ Conectado! IP:");
Serial.println(WiFi.localIP());
// Áudio
auto cfg = kit.defaultConfig(RXTX_MODE);
cfg.sample_rate = 16000;
cfg.channels = 1;
cfg.bits_per_sample = 16;
cfg.input_device = AUDIO_HAL_ADC_INPUT_LINE1; // microfone embutido da ESP32 Audio Kit V2.2
kit.begin(cfg);
kit.setVolume(60); // 🔊 volume ajustado para evitar chiado
serverIn.begin();
serverOut.begin();
Serial.printf("🔊 Porta IN (fala): %d\n", port_in);
Serial.printf("🎤 Porta OUT (mic ): %d\n", port_out);
}
void loop() {
if (serverIn.hasClient()) {
WiFiClient client = serverIn.available();
if (client) {
xTaskCreatePinnedToCore(taskAudioIn, "audioIn", 4096, new WiFiClient(client), 1, NULL, 1);
Serial.println("🔊 Cliente IN conectado");
}
}
if (serverOut.hasClient()) {
WiFiClient client = serverOut.available();
if (client) {
xTaskCreatePinnedToCore(taskAudioOut, "audioOut", 4096, new WiFiClient(client), 1, NULL, 0);
Serial.println("🎤 Cliente OUT conectado");
}
}
delay(100);
}
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[platformio]
default_envs = esp32dev
[env:esp32dev]
platform = espressif32@5.0.0
board = esp32dev
framework = arduino
monitor_speed = 115200
monitor_filters = esp32_exception_decoder
build_flags =
-DAUDIOKIT_BOARD=5
-DCORE_DEBUG_LEVEL=1
-Wno-unused-variable
-Wno-unused-but-set-variable
-Wno-unused-function
-Wno-format-extra-args
lib_deps =
Wire
https://github.com/pschatzmann/arduino-audio-tools.git#v0.9.4
https://github.com/pschatzmann/arduino-audiokit.git#v0.6.3
https://github.com/pschatzmann/arduino-libhelix.git#v0.8
https://github.com/pschatzmann/arduino-libmad.git#v0.7
https://github.com/greiman/SdFat.git#2.2.0
knolleary/PubSubClient@2.8
upload_port = COM3
monitor_port = COM3
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