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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...
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
Jargon buster
Plain-language definitions for the technical terms used above.
- baud
- Baud is the signalling rate of a serial connection, often used as the speed setting for UART communication. Matching the baud rate matters because both connected devices must use the same setting for readable data.
- BLE
- BLE stands for Bluetooth Low Energy, a Bluetooth mode designed for lower power use and modern phone compatibility. It matters because BLE support can make the module easier to use with Apple devices and battery-powered projects, though it may behave differently from classic serial Bluetooth.
- ESP32
- ESP32 is a family of microcontroller modules with built-in wireless features such as Bluetooth and WiFi. Knowing this product uses an ESP32-based module helps explain how it provides wireless serial communication and firmware update features.
- Headers
- Rows of metal pins used to plug a module into a breadboard or connect it with jumper wires. Pre-soldered headers make the module easier to use straight away without needing to solder the pins yourself.
- I2C
- I2C is a two-wire communication bus used by many sensors and small modules. It matters because several I2C devices can share the same two wires, but each device needs a compatible address and your controller must support I2C.
- IoT
- Short for Internet of Things, meaning physical devices that connect to networks or the internet to send data or be controlled remotely. It matters if you want projects such as connected sensors, remote controls or classroom data-logging activities.
- PWM
- Pulse Width Modulation is a way for a digital pin to simulate variable output power by switching on and off very quickly. It matters for controlling things like LED brightness, motor speed, or servo-style signals from a microcontroller pin.
- RTC
- A Real-Time Clock keeps track of time even when the main processor is asleep or powered down, usually with a small backup battery. It matters for data logging and tracking projects that need accurate timestamps.
- SPI
- A fast serial communication bus often used for displays, memory cards, and sensors. It matters because SPI devices need specific pins for clock and data, plus a separate chip-select line for each device.
- SRAM
- Fast temporary memory used by a processor while a program is running. More SRAM helps with projects that handle larger data buffers, networking, displays, or more complex code.
- UART
- UART is a simple serial connection that sends data over separate transmit and receive wires, often labelled TX and RX. It matters because this module is designed to replace a wired UART cable with a wireless link while keeping the same serial data format.
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