M5Stack Atom Echo
Ultra-compact ESP32-PICO smart speaker dev kit (24x24mm) with built-in microphone, speaker, RGB LED, button, and Grove port. Ideal for voice assistant and audio streaming projects.
$13.50
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Specifications
Components
High-sensitivity PDM MEMS microphone for voice capture and audio input
3W Class-D mono audio amplifier with I2S digital input, driving the built-in 0.5W speaker
Individually addressable RGB LED with integrated driver for status indication and visual feedback
Infrared LED for transmitting IR remote control signals to consumer electronics
4-pin Grove connector providing GPIO and I2C interface for external sensors and actuators
Overview
The M5Stack Atom Echo is an ultra-compact smart speaker development kit based on the ESP32-PICO-D4 chip. Measuring just 24x24x17mm, it packs a built-in SPM1423 PDM microphone and speaker driven by an NS4168 I2S amplifier, making it a complete audio I/O solution in a tiny form factor.
Key Features
- Ultra-compact design — 24x24x17mm form factor, weighing only 14g
- Built-in microphone — SPM1423 PDM MEMS microphone for voice input
- Built-in speaker — 0.5W speaker with NS4168 I2S amplifier
- RGB LED — SK6812 programmable RGB LED for visual feedback
- Programmable button — Front-facing button for user interaction
- Grove port — For connecting external sensors and actuators
- IR transmitter — Infrared LED for remote control applications
- USB-C — For programming and power
Specifications
| Parameter | Value |
|---|---|
| SoC | ESP32-PICO-D4 (dual-core 240MHz) |
| Flash | 4MB |
| PSRAM | 8MB |
| Wi-Fi | 802.11 b/g/n (2.4GHz) |
| Bluetooth | BLE 4.2 |
| Microphone | SPM1423 (PDM) |
| Speaker Amp | NS4168 (I2S, 0.5W) |
| LED | SK6812 RGB LED |
| IR | Infrared transmitter |
| Port | 1x Grove (GPIO/I2C) |
| USB | Type-C |
| Dimensions | 24 x 24 x 17 mm |
| Weight | 14g |
Popular Use Cases
The Atom Echo is widely used as a voice assistant satellite with ESPHome and Home Assistant, enabling affordable whole-home voice control. It also serves as a compact Bluetooth speaker, audio streaming endpoint, and general-purpose IoT node.
Resources
Use Cases
5Voice Assistant
Offline and cloud-connected voice assistant, wake-word detection, and speech recognition projects.
smart-speaker
audio-streaming
IoT Prototyping
General-purpose IoT development board suitable for rapid prototyping of connected devices, sensor nodes, and wireless applications.
esphome-node
Where to Buy
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