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* ✅ Various markdown, spelling, and grammar fixes * ✅ Various markdown, spelling, and grammar fixes * ✅ Various markdown, spelling, and grammar fixes
42 lines
1.9 KiB
Markdown
42 lines
1.9 KiB
Markdown
---
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layout: page
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title: "Architecture"
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description: "Overview of the Home Assistant architecture."
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date: 2014-12-18 21:49
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sidebar: true
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comments: false
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sharing: true
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footer: true
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og_image: /images/architecture/ha_architecture.png
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---
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Before we dive into the Home Assistant architecture, let's get a clear overview of the home automation landscape as a whole. This way, we can show how the different parts of Home Assistant fit into the picture.
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For more information about each part in this overview, <a href='/blog/2014/12/26/home-control-home-automation-and-the-smart-home/'>check out our blog</a>. Here's the tl;dr version of the blog:
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* Home Control is responsible for collecting information and controlling devices.
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* Home Automation triggers commands based on user configurations.
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* Smart Home triggers commands based on previous behavior.
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<p class='img'>
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<a href='{{site_root}}/images/architecture/home_automation_landscape.png' name='landscape'>
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<img alt='Home Automation landscape'
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src='{{site_root}}/images/architecture/home_automation_landscape.png' />
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</a>
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Overview of the home automation landscape
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</p>
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The Home Assistant core is responsible for Home Control. Home Assistant contains four parts which make this possible:
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* **Event Bus**: facilitates the firing and listening of events -- the beating heart of Home Assistant.
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* **State Machine**: keeps track of the states of things and fires a `state_changed` event when a state has been changed.
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* **Service Registry**: listens on the event bus for `call_service` events and allows other code to register services.
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* **Timer**: sends a `time_changed` event every 1 second on the event bus.
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<p class='img'>
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<a href='/images/architecture/ha_architecture.png' name='architecture'>
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<img src='/images/architecture/ha_architecture.png' />
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</a>
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Overview of the Home Assistant core architecture
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</p>
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