M5Stack AtomU ESP32 Development Kit with USB-A

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The M5Stack ATOM U is a compact low-power consumption speech recognition IoT development kit. It adopts an ESP32 chipset, equipped with 2 low-power Xtensa 32-bit LX6 microprocessors with the main frequency of up to 240MHz.

The unit also features a built-in USB-A interface, IR emitter and programmable RGB LED. It also offers integrated Wi-Fi and a digital microphone SPM1423(I2S) for clear sound recording - suitable for HMI and Speech-to-Text (STT). It's a convenient plug-and-play unit, easy to upload and download programs.

Low-code Development

The ATOM U supports the UIFlow graphical programming platform. Scripting-free, cloud push and fully compatible with Arduino, MicroPython, ESP32-IDF, and other mainstream development platforms to quickly build various applications.

High Integration

The ATOM U features a USB-A port for programming/power supply, IR emitter, a programmable RGB LED, button and a finely tuned RF circuit providing stable and reliable wireless communication.

Strong Expandability

The ATOM U is compatible with M5Stack's hardware and software systems allowing easy expansion for your projects.


  • ESP32-PICO-D4 (2.4GHz Wi-Fi dual-mode)
  • Integrated programmable RGB LED and button
  • Compact design
  • Built-in IR emitter
  • Expandable pinout and GROVE port
  • Development platform:
  • UIFlow
  • MicroPython
  • Arduino


Specifications Parameters
ESP32-PICO-D4 240MHz dual-core, 600 DMIPS, 520KB SRAM, 2.4G Wi-Fi
Microphone SPM1423
Microphone sensitivity 94dB SPL@1KHz Typical value: -22dBFS
Microphone signal-to-noise ratio 94dB SPL@1KHz, A-weighted Typical value: 61.4dB
Standby working current 40.4mA
Support input sound frequency 100Hz ~ 10KHz
Support PDM clock frequency 1.0 ~ 3.25MHz
Net weight 8.4g
Gross weight 10.6g
Product size 52 * 20 * 10mm
Packing size 68 * 21 * 11mm

Package Contents

  • 1x ATOM U


Driver Installation

Connect the device to the PC, and open the device manager to install the FTDI driver for the device.

Take the win10 environment as an example - download the driver file that matches the operating system, unzip it, and install it through the device manager.

(Note: In some system environments, the driver needs to be installed twice for the driver to take effect. The unrecognized device name is usually M5Stack or USB Serial. Windows recommends using the driver file to install directly in the device manager (custom Update), the executable file installation method may not work properly). Click here to download FTDI driver.

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