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Professional IoT audio development board by Ai-Thinker. Features the ESP32-A1S module with an integrated audio codec. Includes dual onboard microphones, stereo speaker outputs, 3.5mm line-in/out, and a MicroSD slot.
The complete hub for connected audio. The Ai-Thinker ESP32-A1S Audio Kit V2.2 is designed to eliminate the messy wiring usually associated with DIY audio projects. At its core is the ESP32-A1S module. Unlike standard ESP32 chips that require an external DAC/ADC on the circuit board, the A1S integrates the Wi-Fi/Bluetooth silicon, 4MB of PSRAM, and a high-fidelity audio codec (typically an AC101 or ES8388 variant) all underneath its metal shield. This drastically simplifies the board layout and improves signal integrity.
Massive Audio Input and Output Options This board is built to handle true stereo audio. Along the bottom edge, it features two distinct 3.5mm jacks: one for EARPHONES (audio out) and one for LINEIN (analog audio in). If you want to drive physical speakers, the board provides two white 2-pin JST connectors (LOUT and ROUT) capable of directly driving left and right external speakers. For voice capture, you don't even need to plug anything in; the board features two onboard electret microphones (MIC1 and MIC4) positioned on the left side, perfect for stereo recording or ambient noise cancellation algorithms.
Extensive Peripherals and Media Control Designed for rapid prototyping of consumer media devices, the board features a built-in MicroSD Card slot for storing MP3s, WAV files, or logging audio data. Along the left edge, you have a row of six programmable tactile buttons (KEY1 through KEY6), which are perfectly situated to act as playback controls (Play/Pause, Vol+, Vol-, Next, Prev).
Flexible Power and Debugging The board includes two Micro-USB ports at the top: one labeled "UART / POWER" for programming and debugging, and another for auxiliary power. For field testing, it includes a "BAT+" JST connector for a standard 3.7V Lithium-Polymer battery, complete with an onboard charging circuit so your smart speaker can go fully wireless.
Core Module: Ai-Thinker ESP32-A1S (Wi-Fi + BT SoC Inside)
Memory: 4MB SPI Flash / 4MB PSRAM (Integrated)
Audio Codec: Integrated inside the A1S module
Audio Output: 1 x 3.5mm Earphone Jack, 2 x Speaker Out (LOUT/ROUT JST connectors)
Audio Input: 1 x 3.5mm Line-In Jack, 2 x Onboard Microphones
Storage: MicroSD Card Slot
User Interface: 6 x Programmable Keys, 5-Pin DIP Switch Block
Power Supply: 5V via Micro-USB or 3.7V via LiPo Battery port
DIY Smart Speakers: Building custom voice assistants that wake up to a trigger word and query cloud services via Wi-Fi using the dual microphones.
Internet Radio Receivers: Streaming global web radio stations and decoding the audio streams in real-time for stereo playback.
Two-Way Intercoms: Creating a Wi-Fi-based walkie-talkie system for your home.
Audio Storyboxes: Designing interactive, battery-powered toys that play specific MP3s from the SD card when the side buttons are pressed.
Unlock New Capabilities (Project Evolution)
Software Ecosystem: While basic Arduino sketches work, the true power of this board is unlocked by using the Espressif Audio Development Framework (ESP-ADF). It provides extensive, optimized libraries for audio streaming, decoding (MP3, AAC, FLAC), and advanced voice recognition!
Downloads and Links:
Package Includes:
What makes the ESP32-A1S module different from a standard ESP-WROOM-32? The ESP32-A1S ingeniously integrates the Wi-Fi/BT chip, PSRAM, and a dedicated audio codec IC all inside the single metal shielded can. Standard modules require an external codec chip on the main board.
Does this board support true stereo audio? Yes! It features Left and Right speaker outputs (LOUT and ROUT) as well as a stereo 3.5mm earphone jack.
Are there microphones built into the board? Yes, there are two electret microphones (MIC1 and MIC4) soldered directly to the board for stereo voice capture or noise cancellation.
Can I connect external speakers directly? Yes, the LOUT and ROUT white JST connectors have a small onboard amplifier circuit capable of driving small 4-ohm or 8-ohm micro speakers directly.
What is the difference between the two 3.5mm jacks? The one labeled "EARPHONES" is your audio output. The one labeled "LINEIN" is an analog audio input for recording music from an external source.
Why are there two Micro-USB ports? The port labeled "UART / POWER" connects to the onboard serial chip for programming the board via your PC. The other port is used solely for supplying 5V power if you don't need data.
Can I run this on battery power? Yes, there is a white 2-pin JST connector labeled "BAT+" on the top edge for connecting a standard 3.7V Lithium-Polymer (LiPo) battery.
Will it charge my attached LiPo battery? Yes, when a battery is attached and USB power is supplied, the board's internal circuitry will safely charge the battery.
What is the MicroSD slot used for? It allows you to store massive libraries of local MP3/WAV files for playback, or to log audio data recorded by the microphones.
What do the KEY1 through KEY6 buttons do? These are programmable GPIO tactile buttons. They are perfectly positioned to be programmed as media controls (Play, Pause, Next, Volume Up/Down).
What is the block of 5 switches in the middle? That is a DIP switch block. Depending on the firmware and specific board revision, these switches are used to route specific audio lines or enable/disable power to the amplifier circuit.
Can I use the Arduino IDE to program this? Yes, you can use the standard ESP32 core in Arduino, but for advanced audio streaming and voice recognition, the ESP-ADF framework is highly recommended.
Why does it say V2.2 2957 on the board? This indicates the specific hardware revision. Ai-Thinker has released a few versions of this board; V2.2 is one of the most stable and widely supported.
What are the pins on the bottom right (GND, IO0, RST, TX0, RX0)? That is the primary UART programming header. While you usually use the USB port, you can use an external FTDI programmer on these pins if the USB chip fails.
Does the board have built-in PSRAM? Yes, the A1S module contains 4MB of PSRAM, which is absolutely crucial for buffering audio streams without stuttering.
Can it do voice wake-up (like "Alexa")? Yes, using the ESP-ADF software, you can run wake-word engine (WWE) algorithms to trigger actions based on spoken phrases.
Does it support Bluetooth Audio? Yes, the ESP32 supports A2DP, allowing you to program the board to act as a Bluetooth speaker receiver or a Bluetooth audio transmitter.
What are the JTAG pins for? The header labeled "JTAG" allows advanced users to connect a hardware debugger (like an ESP-Prog) to step through their code line-by-line.
What is the back of the board like? The back is mostly flat with circuit traces and solder points. It clearly marks the ESP32-A1S module footprint but has no major interactive components.
Is the board ready to play music out of the box? No, it is a development board. It requires you to write and upload firmware (code) before it will play or record any audio.
This video describes the application and working scenarios ESP32-A1S Audio Development Board Kit
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It was good experience
Staff is very patient and helpful
One of the best place for electronics you will get everything you want! With the best and orginal quality
Very helpful staff and the best place to buy components for projects
Wonderful store with expert service and technically strong people.
Prompt delivery, excellent technical support
Large inventory of electronic components and parts. Well trained service personnel and technicians who can quickly identify and rectify product defect if any. They are a reliable and trustworthy online stores.
Excellent and prompt service
Excellent and prompt response, great and Quality product... All the best... Thank you
I got the thing that was taking the whole Bangalore to search for here
Excellent attitude and prompt service by Bharath. Saved me a trip to SP Road while having ample time to explore new products. Ended up buying much more than what i had originally envisaged. Hope to engage more often and upgrade my skills. God bless
We are into electronics & mechanical projects in this connection we had contacted probots & we visited them , To our pleasant surprise , their presentation with us was friendly wrapped with professional support , which helped us to choose better , this interaction was patient & excellent .with all confidence i shall promote them to my known sources looking for components . Pls maintain this attitude towards customer this shall take your organization to heights
Great place to get all electronic components and accessories for electronic products.
Fast Delivery, Accurate information, Quick resolution, most important acceptance & accountability and willingness to help.
Friendly staff but Too costly, price is 2x as compared to SP road.
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