When [Rec] button on an audio board is pressed, this example will record, and when the button is released, it will play back the recorded file.
For the Recorder:
- We will set up I2S and get audio at sample rate 48000 Hz, 16-bits, stereo.
- Using resample-filter to convert to 16000 Hz, 16-bits, 1 channel.
- Encode with Wav encoder
- Write to microSD
For the Playback:
- We will read the recorded file, with sample rate 16000 Hz, 16-bits, 1 channel,
- Decode with WAV decoder
- Using resample-filter to convert to 48000 Hz, 16-bits, 2 channel.
- Write the audio to I2S
This example is will run on boards marked with green checkbox. Please remember to select the board in menuconfig as discussed is section Usage below.
| Board Name | Getting Started | Chip | Compatible |
|---|---|---|---|
| ESP32-LyraT |  |
 |
 |
| ESP32-LyraTD-MSC |  |
|
|
| ESP32-LyraT-Mini |  |
|
|
| ESP32-Korvo-DU1906 |  |
|
 |
| ESP32-S2-Kaluga-1 Kit |  |
 |
|
Prepare the audio board:
- Connect speakers or headphones to the board.
- Insert a microSD card.
Configure the example:
- Select compatible audio board in
menuconfig>Audio HAL.
Load and run the example:
- By using [Rec] button on the ESP32-LyraT board, when the button is pressed, it will start recording, and when the button is released, it will play back the recorded file.
- To stop the pipeline press [Mode] button on the ESP32-LyraT board.