Audio Server Demo

This project demonstrates an audio server using an ESP32 microcontroller. The server allows users to upload WAV files and play them back using the I2S interface. The code does not require any external audio library.

Features

• Web interface: Upload WAV files to the ESP32 using a web interface.
• Local storage of files: Uploaded WAV files are stored in ESP32 Flash using LittleFS.
• WAV Header Parsing: Read and parse the WAV file header to check the sample rate and bit depth and configure the I2S interface accordingly.
• I2S Playback: Play the uploaded WAV file using the I2S interface.

Hardware Requirements

• ESP32 Development Board
• I2S DAC or amplifier such as max98357a

Software Requirements

• This code uses ESPAsyncWebServer library by lacamera - GitHub Repository - tested with version 3.1.

Installation

1. Install Dependencies:

   • Install the ESP32 core for Arduino.
   • Install the required libraries using the Library Manager in the Arduino IDE or PlatformIO.

2. Configure WiFi Credentials:

   • Add your WiFi credentials to secrets.h:

     #define WIFI_SSID "your-ssid"
     #define WIFI_PASSWORD "your-password"

3. Upload the Code:

   • Connect your ESP32 board to your computer.
   • Open audio_server_demo.ino in the Arduino IDE.
   • Select the correct board and port.
   • Upload the code to the ESP32.

4. Upload the HTML File:

   • The HTML file needs to be uploaded using the LittleFS uploader plugin - follow instructions here.

Usage

1. Start the ESP32:

   • After uploading the code, the ESP32 will start and connect to the configured WiFi network.

2. Access the Web Interface:

   • Open a web browser and navigate to the IP address of the ESP32 (check the serial monitor for the IP address).
   • Use the web interface to upload a WAV file.

3. Playback:

   • The uploaded WAV file will be played back using the I2S interface.