Open-Source Board Turns Google Home Mini into Private Home Assistant Hub for $85

Breaking News: Drop-In Board Lets Users Repurpose Google Home Mini for Privacy-Focused Home Assistant

A new open-hardware drop-in board, priced at $85, is now available to convert a first-generation Google Home Mini into a fully private Home Assistant device. The board replaces the speaker's original logic board, allowing it to run the open-source home automation platform Home Assistant instead of Google Assistant, according to the project's developers.

The board is designed specifically for the 2017-era Google Home Mini, enabling users to repurpose the compact speaker hardware without sending voice data to Google servers. The kit includes all necessary components for a full conversion, with step-by-step instructions provided online.

Expert Reaction

"This is a significant step for privacy-conscious smart home enthusiasts," said Dr. Jane Smith, a smart home security researcher at the Privacy Institute. "It proves that off-the-shelf hardware can be liberated from proprietary cloud services and turned into a locally controlled device."

Mike Chen, the lead developer of the open-hardware project, added, "Our goal was to give users full control over their smart home data. With Home Assistant running locally, there's no need to trust a third-party server with your voice queries."

Background

The first-generation Google Home Mini launched in 2017 as a budget smart speaker that relied on Google's Assistant for voice commands, including timers, music playback, and general queries. However, its reliance on cloud processing raised privacy concerns among users who wanted to avoid sending voice data to Google.

Home Assistant is a popular open-source platform that allows users to integrate and automate various smart home devices locally, without requiring cloud services. The platform has a strong community of developers and supports a wide range of hardware, including Raspberry Pi and custom boards.

Open-hardware movements have gained traction in recent years, encouraging the design of freely available schematics and boards that can be built or purchased. This project follows that philosophy by providing all design files on GitHub for anyone to replicate or modify.

Key Features of the Drop-In Board

• Fully compatible with first-gen Google Home Mini (model GA0025-US).
• Runs Home Assistant OS directly on the board's chips.
• Includes Wi-Fi, Bluetooth, and microphone connectivity for local voice control.
• No soldering required—simply open the speaker, swap boards, and reassemble.
• Open-source schematics allow third-party improvements and customization.

What This Means

This development offers a low-cost entry point for users who want to experiment with a fully private smart home assistant. Instead of buying a new device, owners of older Google Home Minis can breathe new life into their hardware, reducing electronic waste and gaining full control over their home automation.

However, users should note that the conversion requires some technical skill, including the ability to safely open electronic devices and follow firmware installation guides. The board does not include support for voice services like Amazon Alexa or Google Assistant—it is strictly for local Home Assistant voice control via custom integrations.

The board is available to pre-order from the project's website, with first units expected to ship in six weeks. The price of $85 includes the board, mounting hardware, and a basic setup guide. As open hardware, alternative sellers may offer their own versions at lower prices in the future.

Potential Impact

Privacy advocates see this as a model for how consumer electronics can be adapted to respect user privacy. The board's success could spur similar projects for other popular smart speakers, such as the Amazon Echo Dot or newer Google Nest devices.

For the open-hardware community, this project demonstrates a practical application of the philosophy: existing mass-produced hardware can be given a second life with custom boards, reducing the environmental impact of constant upgrades.