ESP32-LyraT-Mini V1.2 Getting Started Guide
This guide provides users with functional descriptions, configuration options for ESP32-LyraT-Mini V1.2 audio development board, as well as how to get started with the ESP32-LyraT board.
The ESP32-LyraT is a hardware platform designed for the dual-core ESP32 audio applications, e.g., Wi-Fi or BT audio speakers, speech-based remote controllers, connected smart-home appliances with one or more audio functionality, etc.
The ESP32-LyraT-Mini is a mono audio board. If you are looking for a stereo audio board, check ESP32-LyraT V4.3 Getting Started Guide.
What You Need
Speaker or headphones with a 3.5 mm jack. If you use a speaker, it is recommended to choose one no more than 3 watts, and JST PH 2.0 2-Pin plugs are needed. In case you do not have this type of plug it is also fine to use Dupont female jumper wires during development.
Two Micro-USB 2.0 cables, Type A to Micro B
PC loaded with Windows, Linux or Mac OS
Optional components
Micro SD-card
Li-ion Battery
If you like to start using this board right now, go directly to section Start Application Development.
Overview
The ESP32-LyraT-Mini V1.2 is an audio development board produced by Espressif built around ESP32. It is intended for audio applications, by providing hardware for audio processing and additional RAM on top of what is already on-board of the ESP32 chip. The specific hardware includes:
ESP32-WROVER-E module
Audio codec chip
ADC chip
Microphone on board
Audio output
1 x 3-watt speaker output
MicroSD card slot (1 line)
Eight keys
Two system LEDs
JTAG and UART test points
Integrated USB-UART Bridge Chip
Li-ion Battery-Charge Management
The block diagram below presents main components of the ESP32-LyraT-Mini and interconnections between components.
ESP32-LyraT-Mini Block Diagram
Components
The following list and figure describe key components, interfaces and controls of the ESP32-LyraT-Mini used in this guide. For detailed technical documentation of this board, please refer to ESP32-LyraT-Mini V1.2 Hardware Reference and ESP32-LyraT-Mini V1.2 schematic (PDF). The list below provides description starting from the picture’s top right corner and going clockwise.
- Audio Codec Chip
The audio codec chip, ES8311, is a low power mono audio codec. It consists of 1-channel ADC, 1-channel DAC, low noise pre-amplifier, headphone driver, digital sound effects, analog mixing and gain functions. It is interfaced with ESP32-WROVER-E Module over I2S and I2C buses to provide audio processing in hardware independently from the audio application.
- Audio Output
Output socket to connect headphones with a 3.5 mm stereo jack. (Please note that the board outputs a mono signal)
- Speaker Output
Output socket to connect a speaker. The 4-ohm and 3-watt speaker is recommended. The pins have a 2.00 mm / 0.08” pitch.
ESP32 LyraT-Mini V1.2 Board Layout Overview
- USB-UART Port
Functions as the communication interface between a PC and the ESP32.
- USB Power Port
Provides the power supply for the board.
- Standby / Charging LEDs
The Standby green LED indicates that power has been applied to the USB Power Port. The Charging red LED indicates that a battery connected to the Battery Socket is being charged.
- Power On Switch
Power on/off knob: toggling it to the top powers the board on; toggling it to the down powers the board off.
- Power On LED
Red LED indicating that Power On Switch is turned on.
- ESP32-WROVER-E Module
The ESP32-WROVER-E module contains ESP32 chip to provide Wi-Fi / Bluetooth connectivity and data processing power as well as integrates 4 MB external SPI flash and an additional 8 MB PSRAM for flexible data storage.
Start Application Development
Before powering up the ESP32-LyraT-Mini, please make sure that the board has been received in good condition with no obvious signs of damage.
Initial Setup
Prepare the board for loading of the first sample application:
Connect speaker to the Speaker Output. Connecting headphones to the Audio Output is an option.
Plug in the Micro-USB cables to the PC and to both USB ports of the ESP32-LyraT-Mini.
The Standby LED (green) should turn on. Assuming that a battery is not connected, the Charging LED (red) will blink every couple of seconds.
Toggle top the Power On Switch.
The red Power On LED should turn on.
If this is what you see on the LEDs, the board should be ready for application upload. Now prepare the PC by loading and configuring development tools what is discussed in the next section.
Develop Applications
Once the board is initially set up and checked, you can start preparing the development tools. The Section Installation Step by Step will walk you through the following steps:
Set up ESP-IDF to get a common development framework for the ESP32 (and ESP32-S2) chips in C language;
Get ESP-ADF to install the API specific to audio applications;
Set up env to make the framework aware of the audio specific API;
Start a Project that will provide a sample audio application for the board;
Connect Your Device to prepare the application for loading;
Build the Project to finally run the application and play some music.
Revision History
Changed the integrated module to ESP32-WROVER-E from ESP32-WROVER-B.