# ESP32-LyraT-Mini V1.2 Getting Started Guide

[中文]

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

- ESP32-LyraT-Mini V1.2 board

- 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:

1. Connect speaker to the Speaker Output. Connecting headphones to the Audio Output is an option.

2. Plug in the Micro-USB cables to the PC and to both USB ports of the ESP32-LyraT-Mini.

3. The Standby LED (green) should turn on. Assuming that a battery is not connected, the Charging LED (red) will blink every couple of seconds.

4. Toggle top the Power On Switch.

5. 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 as discussed in the next section.

### Develop Applications

If the initial setup of the ESP32 LyraT has been checked, please prepare the development tools. Go to Get Started to check out the following steps:

- Step 1. Install ESP-IDF provides a C language PC development toolchain for the ESP32;

- Step 2. Get an ESP-ADF Example Project to obtain the API for developing audio applications;

- Step 2. Get an ESP-ADF Example Project so that the compiler can find the audio application API;

- Step 3. Open the Example Project provides a sample audio application for the ESP32-LyraT-Mini board;

- Step 4. Connect the Development Board to prepare for loading the application;

- Step 7. Build the Project to finally run the application and play music.

## Revision History

- Changed the integrated module to ESP32-WROVER-E from ESP32-WROVER-B.

## Other Boards from LyraT Family

- ESP32-LyraT V4.3 Getting Started Guide

- ESP32-LyraTD-MSC V2.2 Getting Started Guide

## Related Documents

- ESP32-LyraT-Mini V1.2 schematic (PDF)

- ESP32-LyraT-Mini V1.2 Board Dimensions (PDF)

- ESP32-LyraT-Mini V1.2 Hardware Reference

- ESP32 Datasheet (PDF)

- ESP32-WROVER-E Datasheet (PDF)

## Disclaimer and Copyright Notice

See Disclaimer and Copyright Notice.

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