Hi everyone,
I wanted to share an idea for openHAB 5.0: integrating the ESP32-S3 as a lightweight voice satellite for audio streaming to enable decentralized voice recognition. This could provide a cost-effective solution for smart homes that rely on voice control, leveraging the openHAB ecosystem to process commands centrally.
Overview
The concept involves using the ESP32-S3 to capture audio via I2S and stream it over Wi-Fi to openHAB using a WebSocket or similar protocol. The audio can then be processed by openHAB’s voice recognition engine or an external service. Below is a basic example of how this could be implemented.
ESP32-S3 Code (Streaming Audio via Wi-Fi)
#include <WiFi.h>
#include <driver/i2s.h>
// Wi-Fi credentials
const char* ssid = "YOUR_SSID";
const char* password = "YOUR_PASSWORD";
const int port = 12345;
// I2S configuration
#define I2S_WS 25
#define I2S_SD 26
#define I2S_SCK 27
void setup() {
Serial.begin(115200);
// Connect to Wi-Fi
WiFi.begin(ssid, password);
while (WiFi.status() != WL_CONNECTED) {
delay(1000);
Serial.println("Connecting to WiFi...");
}
Serial.println("Connected to WiFi");
// Configure I2S
i2s_config_t i2s_config = {
.mode = (i2s_mode_t)(I2S_MODE_MASTER | I2S_MODE_RX),
.sample_rate = 44100,
.bits_per_sample = I2S_BITS_PER_SAMPLE_16BIT,
.channel_format = I2S_CHANNEL_FMT_ONLY_LEFT,
.communication_format = I2S_COMM_FORMAT_I2S,
.dma_buf_count = 8,
.dma_buf_len = 512,
.use_apll = false
};
i2s_pin_config_t pin_config = {
.bck_io_num = I2S_SCK,
.ws_io_num = I2S_WS,
.data_out_num = I2S_PIN_NO_CHANGE,
.data_in_num = I2S_SD
};
i2s_driver_install(I2S_NUM_0, &i2s_config, 0, NULL);
i2s_set_pin(I2S_NUM_0, &pin_config);
}
void loop() {
WiFiClient client = WiFiServer(port).available();
if (client) {
Serial.println("Client connected");
uint8_t buffer[512];
size_t bytes_read;
while (client.connected()) {
i2s_read(I2S_NUM_0, buffer, sizeof(buffer), &bytes_read, portMAX_DELAY);
if (bytes_read > 0) {
client.write(buffer, bytes_read);
}
}
client.stop();
Serial.println("Client disconnected");
}
}
Java Program (Receiving and Playing the Audio Stream)
import javax.sound.sampled.*;
import java.io.BufferedInputStream;
import java.io.InputStream;
import java.net.ServerSocket;
import java.net.Socket;
public class AudioReceiver {
private static final int PORT = 12345;
private static final int BUFFER_SIZE = 512;
public static void main(String[] args) {
try (ServerSocket serverSocket = new ServerSocket(PORT)) {
System.out.println("Listening for connections on port " + PORT);
Socket socket = serverSocket.accept();
System.out.println("Client connected");
AudioFormat format = new AudioFormat(44100, 16, 1, true, true);
DataLine.Info info = new DataLine.Info(SourceDataLine.class, format);
SourceDataLine audioLine = (SourceDataLine) AudioSystem.getLine(info);
audioLine.open(format);
audioLine.start();
InputStream input = new BufferedInputStream(socket.getInputStream());
byte[] buffer = new byte[BUFFER_SIZE];
int bytesRead;
while ((bytesRead = input.read(buffer)) != -1) {
audioLine.write(buffer, 0, bytesRead);
}
audioLine.drain();
audioLine.close();
socket.close();
System.out.println("Connection closed");
} catch (Exception e) {
e.printStackTrace();
}
}
}
Key Benefits
-
Cost-Effective: ESP32-S3 is affordable and widely available.
-
Decentralized Capture: Audio can be captured in multiple rooms and processed centrally.
-
Scalability: Supports multiple devices streaming to one central hub.
Next Steps
For those interested, feel free to suggest improvements, contribute code, or discuss the technical feasibility. This could become a great addition to openHAB’s voice assistant capabilities!
