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Compact ESP32-S3 USB-A Development Board with PDM Microphone, IR Emitter, and Grove Expansion
The M5Stack K125 AtomS3U is a compact USB flash-drive-style development board based on the ESP32-S3FN8 SoC. It integrates a dual-core Xtensa 32-bit LX7 processor running at up to 240 MHz, 8MB in-package Flash, and 2.4 GHz Wi-Fi connectivity. The built-in USB Type-A connector supports native USB OTG and USB Serial/JTAG functions, allowing the board to be directly integrated into USB-connected IoT, embedded control, and human-machine interaction applications.
AtomS3U integrates an SPM1423 PDM digital microphone, infrared emitter, programmable WS2812 RGB LED, and programmable button for audio, indication, and interactive control applications. Expansion is provided through a HY2.0-4P Grove interface and a 6-pin 2.54 mm header exposing 5V, GND, and four GPIOs. Its integrated microphone supports voice capture and speech-to-text applications, while development support for UiFlow2, Arduino IDE, ESP-IDF, and PlatformIO provides multiple programming options for IoT control, USB-device projects, voice-input systems, and custom embedded applications.
Key Features
- ESP32-S3 Processor: ESP32-S3FN8 with dual-core Xtensa 32-bit LX7 processor running at up to 240 MHz
- Flash Memory: 8MB in-package Quad SPI Flash
- Wireless Connectivity: Integrated 2.4 GHz Wi-Fi
- Native USB: USB Type-A connector with USB OTG and USB Serial/JTAG support
- USB CDC: Supports USB Communications Device Class operation
- Digital Microphone: Integrated SPM1423 PDM microphone for audio capture and voice-input applications
- Microphone Frequency Range: Supports audio input from 100 Hz to 10 kHz
- Microphone SNR: Typical 61.4 dB, A-weighted at 94 dB SPL / 1 kHz
- Microphone Sensitivity: Typical -22 dBFS at 94 dB SPL / 1 kHz
- Infrared Output: Integrated IR emitter for remote-control and infrared-transmission projects
- RGB Indicator: 1xprogrammable WS2812 RGB LED
- User Input: Integrated programmable button
- Grove Expansion: HY2.0-4P interface for external M5Stack Units and peripherals
- GPIO Expansion: 6-pin 2.54 mm header with 4 GPIOs
- Compact Form Factor: USB-drive-style enclosure measuring 53.0x20.0x10.3 mm
- Development Support: UIFlow2, Arduino IDE, ESP-IDF, and PlatformIO
Applications
- IoT controller development
- Voice recording
- Cloud speech-to-text recognition
- USB OTG projects
- USB peripheral development
- Human-machine interaction
- Infrared remote-control projects
- Smart home controllers
- Voice-input IoT devices
- GPIO control systems
- Embedded automation
- Compact Wi-Fi nodes
- USB-connected sensor devices
- Educational ESP32-S3 development
PinMap
Model Size
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