Onju-Voice

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Onju Voice is an open-source AI home assistant platform that allows for a hackable AI home assistant experience. It uses a custom PCB designed as a drop-in replacement for the Google Nest Mini (2nd gen) and an ESP32-S3 for audio processing.

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At a glance

Pricing

Open Source

Free tier

Yes

API

Skill level

Technical

About

What is onju-voice?

Onju Voice is an open-source, hackable AI home assistant platform built around the Google Nest Mini (2nd gen) form factor. It features a custom PCB with an ESP32-S3 for audio processing and a server for handling transcription, response generation, and Text-to-Speech across multiple devices on the same network. While not a full-fledged replacement for a home assistant, it focuses on experimental conversational LLM aspects. The platform supports auto-discovery of devices, remembers conversation history, and offers speaker/microphone visualization with LEDs. It allows for querying messages, light control with Home Assistant, and adding/retrieving notes for the LLM. The project is deprecated, but all source code and design files are available for community contributions.

Best used for

Ideal for developers and startup founders who need to build custom AI home assistant solutions, integrate with existing smart home platforms like Home Assistant, and experiment with conversational LLMs. Especially valuable for those looking to leverage open-source hardware and software for voice-controlled applications.

Common actions

build home assistant

process audio

generate responses

integrate smart home

customize voice assistant

low-code/no-codecollaborationworkflowsdeepfakeopen-sourceautomated workflowface swappinggithub copilot"AI Agents"

Capabilities

Key features

Custom PCB design
ESP32-S3 audio processing
Server-side transcription
LLM response generation
Text-to-Speech
Home Assistant integration
Device auto-discovery

Target Audience

developerstartup founder

Integrations

home-assistantopenaielevenlabs

Pricing & Plans

Open Source

Free

FAQs

Does Onju Voice fully replace a Google Nest Mini?

No, Onju Voice replicates the interfaces but is not a 1:1 replacement. It's not intended as a music playback device and requires a separate server, which can run locally. It serves more as a development board with examples for building custom AI home assistant functionalities.

What hardware is required to use Onju Voice?

You will need a Google Nest Mini (2nd gen) for its form factor, a custom PCB (design files provided), and an ESP32-S3 for audio processing. Alternatively, you can breadboard components like an ESP32-S3 devboard, microphone, amplifier, speaker, and Neopixel LED strip.

What are the limitations of the current Onju Voice release?

The current release lacks advanced audio features like VAD, AEC, and BSS due to Arduino IDE limitations. It also has a highly serialized conversation flow, no wakeword usage, and primarily uses OpenAI and Elevenlabs for LLM and TTS, with local transcription.

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