292 lines
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292 lines
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<title>Architecture - Home Assistant</title>
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<span>Home Assistant</span>
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<header>
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<h1 class="title indent">
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Architecture
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</h1>
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<hr class="divider">
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<p>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.</p>
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<p>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:</p>
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<ul>
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<li>Home Control is responsible for collecting information and controlling devices.</li>
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<li>Home Automation triggers commands based on user configurations.</li>
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<li>Smart Home triggers commands based on previous behavior.</li>
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</ul>
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<p class="img">
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<a href="/images/architecture/home_automation_landscape.png" name="landscape">
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<img alt="Home Automation landscape" src="/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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<p>The Home Assistant core is responsible for Home Control. Home Assistant contains four parts which make this possible:</p>
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<ul>
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<li><strong>Event Bus</strong>: facilitates the firing and listening of events – the beating heart of Home Assistant.</li>
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<li><strong>State Machine</strong>: keeps track of the states of things and fires a <code class="highlighter-rouge">state_changed</code> event when a state has been changed.</li>
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<li><strong>Service Registry</strong>: listens on the event bus for <code class="highlighter-rouge">call_service</code> events and allows other code to register services.</li>
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<li><strong>Timer</strong>: sends a <code class="highlighter-rouge">time_changed</code> event every 1 second on the event bus.</li>
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</ul>
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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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</article>
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<div class='edit-github'><a href='https://github.com/home-assistant/home-assistant.github.io/tree/current/source/developers/architecture.markdown'>Edit this page on GitHub</a></div>
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<h1 class="title delta">Development Guide</h1>
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<li>
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<a href='/developers/'>Introduction </a>
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<ul>
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<li><a class='active' href='/developers/architecture/'>Architecture </a></li>
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<li>
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<a href='/developers/development/'>Starting with Development </a>
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<li><a href='/developers/development_environment/'>Setting up Environment </a></li>
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<li><a href='/developers/development_submitting/'>Submit your Work </a></li>
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<li><a href='/developers/development_guidelines/'>Style guidelines </a></li>
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<li><a href='/developers/development_testing/'>Testing </a></li>
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</ul>
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<a href='/developers/development_101/'>Development 101 </a>
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<li><a href='/developers/development_hass_object/'>Hass object </a></li>
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<li><a href='/developers/development_events/'>Events </a></li>
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<li><a href='/developers/development_states/'>States </a></li>
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<li><a href='/developers/development_services/'>Services </a></li>
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<li><a href='/developers/development_config/'>Config </a></li>
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</ul>
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</li>
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<li>
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<a href='/developers/add_new_platform/'>Creating a new platform (to support a new device) </a>
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<li><a href='/developers/code_review_platform/'>Checklist creating a platform </a></li>
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<li><a href='/developers/platform_example_sensor/'>Example sensor platform </a></li>
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<li><a href='/developers/platform_example_light/'>Example light platform </a></li>
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</ul>
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<a href='/developers/creating_components/'>Adding a new component </a>
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<li><a href='/developers/component_events/'>Handling events </a></li>
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<li><a href='/developers/component_states/'>States </a></li>
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</ul>
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<a href='/developers/intent/'>Intents (handling voice responses) </a>
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<li><a href='/developers/intent/firing/'>Firing intents </a></li>
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<li><a href='/developers/intent/handling/'>Handling intents </a></li>
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<li><a href='/developers/intent/conversation/'>Registering sentences </a></li>
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</ul>
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</li>
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<li>
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<a href='/developers/asyncio/'>Asynchronous Programming </a>
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<ul>
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<li><a href='/developers/asyncio_101/'>Introduction to asyncio </a></li>
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<li><a href='/developers/asyncio_categorizing_functions/'>Categorizing Functions </a></li>
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<li><a href='/developers/asyncio_working_with_async/'>Working with Async </a></li>
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<li><a href='/developers/asyncio_misc/'>Miscellaneous </a></li>
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</ul>
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<a href='/developers/frontend/'>Frontend Development </a>
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</ul>
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<li>
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<a href='/developers/hassio/architecture/'>Hass.io architecture </a>
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<li><a href='/developers/hassio/debugging/'>Debugging Hass.io </a></li>
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</ul>
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<li>
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<a href='/developers/hassio/addon_development/'>Hass.io Add-on Development </a>
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<li><a href='/developers/hassio/addon_tutorial/'>Tutorial: Making your first add-on </a></li>
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<a href='/developers/api/'>API </a>
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<li><a href='https://dev-docs.home-assistant.io/en/dev/'>Python API </a></li>
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<a href='/developers/documentation/'>Website/Documentation </a>
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Governance
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