A Cloud-Free Smart Home: How My System Works

My smart home system, which I’ve been building since 2019, runs entirely in my own home and on my own network, with no cloud dependency. Today it has 40+ physical devices, 17+ custom automation rules, and a single Raspberry Pi 4 at its core. In this post, I’m sharing the hardware I use, the system architecture, and the automation logic in detail — so others can build their own.

Why Local Control?

Most "smart home" products on the market send your data to the manufacturer’s cloud and manage everything from there — they stop working when the internet goes down, keep you dependent on third-party servers, and often charge a monthly subscription. I aimed for the opposite: none of the camera footage, sensor data, or commands ever leave the house; the system keeps working even if the internet goes out; there’s no third-party subscription fee.

System Architecture

At the center is a Raspberry Pi 4 running Home Assistant OS. Through MQTT, ESPHome, Matter, go2rtc, and HACS integrations, it can talk to over 2,000 different devices and services; when needed, I can SSH straight into the system to make changes. This single hub ties together all the device groups below.

The Hardware I Use

• Sensors (8): 5× motion sensors, 2× smart buttons, 1× door sensor — all tied into battery-tracking automations.
• Lighting (20 points): 18× Sonoff smart switches + 2× WLED fixtures I designed myself — all running in cloud-free LAN mode.
• Security: a Eufy 2K camera with local RTSP streaming and AI-assisted motion detection.
• Appliances & air quality: Bosch washer + dishwasher (Home Connect Local), a Dreame robot vacuum, and a Philips air purifier (PM2.5 and energy monitoring).
• Media: a Toshiba TV, an Epson projector, and a Broadlink IR bridge that brought even old remote-control-only devices into the system.
• Network & bridges: Huawei router monitoring, a Eufy Security WS bridge.

Voice Assistant: "Home AI"

Microphones built from M5Stack Atom Echo units, placed around the house, start listening on a custom "Home AI" wake word. Speech is transcribed locally with Whisper, the command is interpreted contextually via Google AI Conversation, and the reply is spoken back in Turkish by a locally-running Piper. So when I say "Hey Home AI, is the laundry done?", none of the audio is processed in the cloud, and there’s no lag.

Automations & Family-Friendly Design

Most of my 17 custom automation rules are family-focused: different motion-detection logic for kids’ rooms, a silent-notifications mode at night, extra security scenarios in vacation mode, an arrival greeting based on iPhone location, and an alert if a door is left open. On the interface side, instead of complex dashboards I use a simple Bubble Card design; everyone in the house can access it easily through a wall-mounted tablet and phone widgets.

Backups & Sustainability

The system has automatic daily backups, I can reach the configuration remotely through VS Code Server, and inter-device messaging runs over a Mosquitto MQTT broker — details that keep the system maintainable and easy to grow over the years.

Where I’ve Landed

Today: 40+ physical devices, 17+ automation rules, 8 sensors, 20 lighting points, 100% local control, and $0 in monthly subscription fees. If you’re thinking about building your own system, or have a question about a specific part of it, feel free to reach out through the Contact page.