ESP-LyraT-8311A v1.3


This user guide provides information on the ESP-LyraT-8311A extension board.

This board cannot be bought separately and is usually sold together with other Espressif development boards (e.g., ESP32-S2-Kaluga-1), which will be referred to as main boards below.

Currently, ESP-LyraT-8311A v1.3 is sold as part of the ESP32-S2-Kaluga-1 Kit v1.3.

The ESP-LyraT-8311A extends the functionality of your main board by adding sound processing functionality:

  • Audio playback/recording

  • Processing of audio signals

  • Programmable buttons for easy control

This extension board can be used in many ways. The applications might include voice user interface, voice control, voice authorization, recording and playback of sound, etc.


ESP-LyraT-8311A (click to enlarge)

The document consists of the following major sections:

  • Overview: Provides an overview and hardware setup instructions.

  • Hardware reference: Provides more detailed information about the ESP-LyraT-8311A’s hardware.

  • Hardware Revision Details: Covers revision history, known issues, and links to user guides for previous versions of the ESP-LyraT-8311A.

  • Related Documents: Gives links to related documentation.


The ESP-LyraT-8311A is mainly designed for audio applications. However, you can use your creativity to come up with any other use cases.

Description of Components

ESP-LyraT-8311A - front

ESP-LyraT-8311A - front (click to enlarge)

The description of components starts from the top right corner and then goes clockwise.

Reserved means that the functionality is available, but the current version of the kit does not use it.

Key Component


Extension Header

Male Extension Header on the flip side is for mounting onto main board’s Extension Header; Female Extension Header is for mounting other boards that have a Male Extension Header

Function Button

This board has six programmable buttons


Supports Electret and MEMS microphones; this extension board is supplied with an electret microphone

Headphone Connector

6.3 mm (1/8”) stereo headphone connector

Speaker Connector

Connect an external speaker to the 2-pin connector


3 W Audio signal amplifier for the external speaker

External Mic-Matrix Connector

(Reserved) FPC connector for external Mic-Matrix (microphone boards)


(Reserved) high-performance ADC/ES7243: 1 channel for microphone, 1 channel for acoustic echo cancellation (AEC) function

Mono Audio Codec

ES8311 audio ADC and DAC; it can convert the analog signal picked up by the microphone or convert digital signal to play it back through a speaker or headphones

Start Application Development

Before powering up your ESP-LyraT-8311A, please make sure that it is in good condition with no obvious signs of damage.

Required Hardware

  • Board with a female Extension Header (e.g., ESP32-S2-Kaluga-1)

  • ESP-LyraT-8311A extension board

  • Four mounting bolts (for stable mounting)

  • Computer running Windows, Linux, or macOS

Hardware Setup

To mount your ESP-LyraT-8311A onto the board with a female Extension Header:

  1. Install the four mounting bolts onto the board with a female Extension Header

  2. Align the ESP-LyraT-8311A with the bolts and Extension Header and insert it carefully

Software Setup

Depending on your application, see:

  • ESP-ADF Getting Started Guide if you develop with ESP-ADF (Espressif Audio Development Framework).

  • Section Software Setup of the ESP32-S2-Kaluga-1 kit user guide if you develop directly with ESP-IDF (Espressif IOT Development Framework).

Hardware Reference

Block Diagram

A block diagram below shows the components of ESP-LyraT-8311A and their interconnections.

ESP-LyraT-8311A block diagram

ESP-LyraT-8311A block diagram

Hardware Revision Details

ESP-LyraT-8311A v1.3

  • ADC/ES7243 and ADC/ES7210 removed as the Mono Audio Codec chip provides all the needed functionality.

ESP-LyraT-8311A v1.2

Initial release