This product comes with ESP-ADF firmware, which can be tested by the user using the ADF on Github and modified to its own firmware.
ESP32-LyraT is an audio development board specially developed by Lexin for the voice interactive market, using ESP32-WROVER module. The module is highly integrated and includes 4.5 MB of RAM. Based on ESP32 dual-core processor and powerful Wi-Fi+BT function, ESP32-LyraT can realize high-integration audio solution with few peripheral devices, and quickly develop intelligent audio, intelligent story machine and intelligence. Home and other products have greatly shortened the product development cycle.
Product description:
Button: Touch + physical button
Power supply mode: USB power supply or external power supply
Functional description:
- Support multiple audio input: Wi-Fi, Bluetooth audio, AirPlay, DLNA, line-in, etc.
- Double mic pickup for near field and far field speech recognition
- Supports a variety of mainstream lossless audio formats: ALAC, AAC, FLAC, OPUS, MP3, WAV, OGG, etc.
- Complete wireless standard - Wi-Fi 802.11b/g/n, Classic BT, BLE
- Support multiple distribution networks: BLE distribution network, Airkiss distribution network, etc.
4 ohm speakers with DuPont female jumpers or headphones with 3.5 mm audio interface
Two Micro-USB 2.0 data cables (Type A to Micro B)
PC (Windows, Linux, or Mac OS)
Optional components
Micro SD card
lithium battery
Overview
ESP32-LyraT-Mini 1.2 is an audio development board based on Espressif ESP32 specifically for the audio application market. It mainly includes audio codec chip, external expansion RAM and dual-core ESP32 chip. The hardware includes:
ESP32-WROVER-B module
Audio codec chip
ADC chip
microphone
Audio output
1 x 3-watt speaker output
MicroSD card slot (one-line mode)
Eight keys
Two system indicators
JTAG and UART test points
Integrated USB-UART bridge chip
Lithium battery charge management
The following figure shows the main components of the ESP32-LyraT-Mini and how to connect them.
Audio codec chip
Audio codec chip ES8311 is a low power mono audio codec. It consists of a single-channel ADC, a single-channel DAC, a low-noise preamp, a headphone driver, a digital sound processor, an analog mixer, and a gain function. This chip provides hardware audio processing function by connecting with ESP32-WROVER-B module through I2S and I2C bus.
Audio output
Audio output slot for 3.5 mm stereo headphones. (Please note that this development board outputs a mono signal)
Speaker output
Audio output slot with 2.54 mm / 0.1 ”standard pin pitch for 4 ohm speakers.
USB-UART interface
As a communication interface between PC and ESP32.
USB charging port
Can be used as a power supply for development boards.
Standby / Charge indicator
The green standby light is on to indicate that power is connected to the USB charging port. The red charge light is on to indicate that the battery on the battery holder is charging.
switch
Power on / off button: Slide the button up to turn on the power of the development board; turn it down to turn off the power.
Power Indicator
The red indicator light indicates that the power switch is on.
ESP32-WROVER-B module
The ESP32-WROVER-B module contains an ESP32 chip, which can provide Wi-Fi / Bluetooth connection and digital processing capabilities. It also integrates 32 Mbit SPI flash and 64 Mbit PSRAM to achieve flexible data storage.
Application development
Before powering on the ESP32-LyraT-Mini, please make sure that the development board is intact.
default setting
Set up the development board and run the first sample application:
Connect a 4 ohm speaker to the speaker output. You can also choose to connect headphones to audio output.
Use a Micro-USB data cable to connect both USB ports of the ESP32-LyraT-Mini development board to the PC.
The green standby indicator should now light up. Assuming the battery is not connected, the red charge indicator will flash every few seconds.
Slide the power switch up.
The red power indicator should now light up.
If the indicators are displayed as described above, the board is basically intact and can be used to download applications. Now, follow the instructions below to run and configure the development tools on your PC.
