M5Stack Atom Echo S3R Smart Speaker Dev Kit

Quick verdict

Ultra-cheap thumb-sized ESP32-S3 voice puck with mic, speaker and codec that M5Stack documents as a ready HA Assist satellite. Flashes ESPHome and connects straight to the HA Assist pipeline on your LAN, no cloud. Just note: Single mic, limited far-field range.

Standout: Ultra-cheap thumb-sized ESP32-S3 voice puck with mic, speaker and codec that M5Stack documents as a ready HA Assist satellite.

Last checked: 2026-06-02

Compatibility snapshot

Why it stands out

• Costs about $15
• ESP32-S3 with 8MB PSRAM and official HA satellite config
• Tiny footprint, USB-C powered

Reasons to hesitate

• Single mic, limited far-field range
• No screen
• Best in quiet/near-field use

Best for

• Cheapest way to add a room
• Push-to-talk/near-field commands

Avoid if

• you want a finished, plug-and-play product rather than a DIY/flashing project

Privacy and local-control notes

Flashes ESPHome and connects straight to the HA Assist pipeline on your LAN, no cloud.

Home Assistant support: supported · integration path: ESPHome (native, local).

Built with ESPHome — see our ESPHome guide for Home Assistant →

Buying reality check

Price notes: Around $15. Among the more affordable options in this category.

Compare side by side: see voice assistant comparisons →