M5Stack Atom Echo S3R
ESP32-S3 smart speaker dev kit with ES7210 audio codec, NS4168 amplifier, dual MEMS microphones, and RGB LED. Designed for Home Assistant voice assistant, ESPHome, and audio streaming projects.
$15.50
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Specifications
Components
Espressif ESP32-S3FN16R8 dual-core Xtensa LX7 SoC at 240MHz with 16MB flash, 8MB PSRAM, WiFi 802.11 b/g/n, BLE 5.0, and USB OTG.
Everest Semiconductor ES7210 four-channel audio ADC with 24-bit resolution, 102 dB SNR, and I2S/TDM output for high-quality voice capture.
Nationzsemi NS4168 mono Class-D audio amplifier with I2S digital input, 3W output into 4 ohms, and filterless design for compact speaker applications.
MEMS microphones for voice capture with high sensitivity and low noise floor, optimized for far-field voice recognition.
Bus Interfaces
M5Stack Atom Echo S3R
The Atom Echo S3R is M5Stack's upgraded smart speaker development kit, replacing the original Atom Echo with a more powerful ESP32-S3 SoC and significantly improved audio hardware. It is purpose-built for voice assistant applications, particularly with Home Assistant.
Key Upgrades over Original Atom Echo
- ESP32-S3 replaces ESP32-PICO-D4 — dual-core Xtensa LX7 at 240MHz with 16MB flash and 8MB PSRAM
- ES7210 audio ADC — 4-channel 24-bit audio codec with 102 dB SNR for high-quality voice capture
- NS4168 Class-D amplifier — I2S digital input speaker driver for clean audio output
- Dual MEMS microphones for improved voice pickup and noise rejection
- BLE 5.0 alongside WiFi 802.11 b/g/n
Hardware Features
- Programmable RGB LED (SK6812) for visual feedback
- Built-in button for interaction
- Grove port (I2C) for sensor expansion
- USB-C for power and programming
- Ultra-compact form factor in the M5Stack Atom series
Voice Assistant Integration
The Atom Echo S3R is one of the recommended devices for the Home Assistant voice assistant pipeline. With ESPHome firmware, it supports:
- Local wake word detection (microWakeWord)
- Speech-to-text via Home Assistant cloud or local Whisper
- Text-to-speech response through the built-in speaker
- Intent recognition for smart home control
Firmware Support
- ESPHome — primary firmware for Home Assistant voice assistant with YAML configuration
- Arduino — full Arduino IDE/PlatformIO support via ESP32-S3 board package
- ESP-IDF — Espressif's official SDK for custom firmware
- UIFlow — M5Stack's visual programming platform for rapid prototyping
Use Cases
4Voice Assistant
Offline and cloud-connected voice assistant, wake-word detection, and speech recognition projects.
Smart Home
Home automation devices for controlling lighting, climate, security, and appliances.
Music Player
Embedded audio player with speaker output, controls, and display for playing audio files or streaming.
IoT
Internet of Things applications including connected sensors, actuators, and smart devices that communicate over WiFi, BLE, LoRa, or other wireless protocols.
Where to Buy
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