Home Assistant — Home Automation Platform

Last reviewed: 2026-09-17

Home Assistant is a free and open-source home automation platform that focuses on local control, privacy, and integration with hundreds of smart home devices, services, and protocols. It runs on a Raspberry Pi, local server, or Docker/NixOS.

Overview

Home Assistant (often abbreviated HA or Hass) provides: - A unified dashboard for all smart home devices - Automation engine (triggers, conditions, actions) - Voice assistants (Alexa, Google Home, Assist) - Energy management dashboards - Over 2,000 integrations (Wi-Fi, Zigbee, Z-Wave, Matter) - Fully local — no cloud dependency

Key Concepts

Integrations

HA connects to devices through integrations (formerly called "components"). Common ones include:

Integration	What it connects
ESPHome	ESP32/ESP8266 custom sensors and controllers
MQTT	MQTT broker (E.g., Mosquitto) for IoT devices
Zigbee2MQTT	Zigbee devices via a coordinator
Z-Wave JS	Z-Wave devices
Philips Hue	Hue bridge and lights
Shelly	Shelly smart relays
Tesla	EV charging and battery status

Automations

Automations follow a simple pattern:

Trigger → Condition → Action

Example: "Turn on porch light when motion detected after sunset"

Trigger: Motion sensor detects movement
Condition: Sun below horizon (or after specific time)
Action: Turn on porch light entity

Dashboards (Lovelace)

Home Assistant's default dashboard UI is called Lovelace. You can: - Arrange cards (buttons, graphs, gauges, maps) - Create custom views per room or function - Add themes and custom card plugins - Control: lights, climate, locks, covers, media players

Add-ons

On HA OS or Supervised installations, add-ons extend functionality: - Mosquitto broker — MQTT message broker - ESPHome — Flash/configure ESP devices - File editor — Edit config files in-browser - Samba share — Network file access - Nginx Proxy Manager — Reverse proxy + SSL - Zigbee2MQTT — Zigbee gateway

Installation Options

Method	Recommended For
HA OS (Raspberry Pi)	Dedicated hardware — easiest
HA Container (Docker)	Existing Docker host
HA Core (Python venv)	Advanced users, custom setups
HA Supervised	Full OS with add-ons in Docker
NixOS (module)	NixOS users

Common Use Cases

Lighting automation — Motion/time-based, scenes
Climate control — Smart thermostat, window sensor triggers
Security — Door sensors, cameras, alarm panel
Energy monitoring — Solar + grid + battery dashboard
Presence detection — Bluetooth, Wi-Fi, GPS tracking
Voice control — Local voice assistant with Assist/Whisper