ESP32-A1S Wi-Fi+BT Audio Development Kit

The ESP32-A1S Audio Development Kit is a feature-rich audio development board built around the ESP32-A1S module. It includes a dual-core Xtensa LX6 processor, Wi-Fi, Bluetooth 4.2, and a complete set of audio interfaces — making it an all-in-one platform for building smart speakers, voice assistants, and IoT audio devices.

Audio I/O is distributed on both sides of the board for easy access, including a 3.5 mm headphone jack, 3.5 mm line-in jack, two built-in microphones, and speaker header pins supporting up to 4Ω/3W output per channel. The board is compatible with Espressif's ESP-ADF framework, which offers support for Google Assistant and Amazon Alexa integration.

Key Features

• ESP32-A1S Module – Dual-core Xtensa LX6 CPU, up to 600 DMIPS
• Wi-Fi 802.11 b/g/n – Up to 150 Mbps, 2.4 GHz band
• Bluetooth 4.2 – BR/EDR and BLE with CVSD and SBC audio codec support
• Audio Output – 3.5 mm headphone jack + stereo speaker headers (4Ω/3W per channel)
• Audio Input – 3.5 mm line-in jack + 2× built-in analogue microphones
• MicroSD Slot – Supports up to 64 GB cards
• 8 MB PSRAM – Additional memory for audio buffering and processing
• Dual Power Options – 5V/2A USB or 3.7V lithium battery
• Smart Config / AirKiss – One-click Wi-Fi network provisioning
• STA / AP / STA+AP Modes – Flexible wireless operation

Specifications

• CPU – Xtensa 32-bit LX6 dual-core, up to 600 DMIPS
• SRAM – 520 KB + 16 KB RTC SRAM
• PSRAM – 8 MB
• SPI Flash – 4 MB (32 Mbit)
• I/O Ports – 10
• Interfaces – UART, SPI, I2C, PWM
• Default UART Baud Rate – 115200 bps
• Wi-Fi – 802.11 b/g/n, 2412–2484 MHz, A-MPDU and A-MSDU aggregation
• Bluetooth – 4.2 BR/EDR + BLE, −98 dBm sensitivity, AFH

Ideal For

• Smart speakers and voice assistant devices
• IoT audio streaming applications
• Smart home audio controllers

Package Contents

• 1× ESP32-A1S Wi-Fi+BT Audio Development Kit

Resources

• ESP-ADF Documentation
• User Guide (GitHub)