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

Revolutionary Drop-In Board Lets You Ditch Google’s Cloud for Local Smart Home Control

A new open-source hardware board now lets owners of the original Google Home Mini replace its cloud‑dependent voice assistant with the fully local, privacy‑focused Home Assistant platform — all for just $85.

This drop-in replacement board swaps out the smart speaker’s original electronics, keeping the same microphone array and speaker. The result: a device that listens only to you, not to Google’s servers.

“We wanted to show that repurposing existing hardware can be both affordable and powerful. Users get a dedicated Home Assistant controller without buying a new device — and without sending any voice data to the cloud,” said Sarah Chen, lead developer of the open‑hardware project.

Background: Why This Matters Now

The first‑gen Google Home Mini launched in 2017 as a low‑cost entry into smart speakers. It relied entirely on Google Assistant’s cloud servers to process voice commands, raising long‑standing privacy concerns.

Home Assistant, by contrast, runs fully on local hardware. No audio snippets, query logs, or usage patterns ever leave the device. For smart home enthusiasts, this board offers a second life for a popular but aging gadget.

What This Means for Smart Home Users

If you own a first‑gen Google Home Mini, this $85 board is a cost‑effective way to gain a dedicated Home Assistant voice controller. Installation is straight‑forward: open the speaker, remove the original mainboard, and plug in the replacement.

Unlike software‑only hacks, this hardware swap guarantees full compatibility with Home Assistant’s voice pipeline — including local wake word detection and offline command execution. The result is a smart speaker that respects your privacy without sacrificing convenience.

Key Benefits at a Glance

• Full local processing — no internet connection required for voice commands.
• Open source — design files are publicly available for inspection and modification.
• Plug‑and‑play — fits the exact footprint of the original board; no soldering or case modification needed.
• Cost savings — much cheaper than buying a new Home Assistant‑compatible voice controller.

What Experts Are Saying

“This is a textbook example of right to repair and privacy by design,” commented Dr. Mark Rivera, a cybersecurity researcher at the Open Tech Institute. “Instead of throwing away a perfectly good speaker, users can give it a new purpose while taking control of their data.”

Other home automation communities have praised the board for its simplicity. Reddit’s r/homeassistant is already bubbling with installation guides and customization ideas.

How to Get Involved

The board is available now through the project’s official store at $85 (plus shipping). No coding or advanced electronics skills are required — just a Phillips‑head screwdriver and about 15 minutes of time.

For those who prefer a DIY approach, the complete design files are free to download under an open hardware license. The community is already working on add‑on sensors and a version for the Google Nest Mini.

Bottom Line

The 2017 Google Home Mini is no longer just a cloud spy — it can become the centerpiece of your private, local smart home. With this $85 board, you keep your voice data yours and breathe new life into old hardware.

Learn more about the project’s background or jump straight to the impact for users.