usb_mic_recorder

Overview

This project is to transfer the on-board microphone data to the computer via the USB audio device function.

Supported Development Boards

• ESP-BOX
• ESP32-S3-Korvo-2: You need to remove the 0-ohm resistors (R181,R182) at USB_DM and USB_DP and add two 0-ohm resistors (R394,R395) at ESP_USB_DM and ESP_USB_DP. Hardware Schematic

How To USE

1. compile and flash project

idf.py set-target esp32s3 
idf.py flash

Note: After you flash this project, the device will act as a USB sound card. If you want to flash other projects by USB again, Please hold down Boot and then press Reset to initiates firmware-download-mode.

2. select sound card device

When you plug the usb port into your computer(Linux only), it will display the MicNode sound card device. Please select MicNode sound card device.

3. Recording by arecord

```bash
# Install arecord
sudo apt-get install alsa-utils alsa-tools alsa-tools-gui alsamixergui -y

# Show the list of CAPTURE hardware devices
arecord -l

# Start to record
arecord -Dhw:1,0 -d 60 -f cd -r 16000 -c 2 -t wav voice.wav
#-D, --device=NAME       select CAPTURE hardware device, hw:1,0 means card 1 and device 0
#-d, --duration=#        interrupt after # seconds
#-f, --format=FORMAT     sample format, cd: 16 bit little endian, stereo)
#-r, --rate=#            sample rate
#-c, --channels=#        channels
#-t, --file-type TYPE    file type (voc, wav, raw or au)

# Print help info
arecord -h
```