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<title>Adding support for a new platform - Home Assistant</title>
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<meta name="description" content="Hints and tips for when you're adding a new platform to Home Assistant.">
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<h1 class="title indent">
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Adding Support for a New Platform
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</h1>
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<hr class="divider">
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<p>Components that interact with devices are called Entity Components. They are structured in core- and platform logic. This allows the same logic to handle a light to be used by different brands.</p>
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<p>For example, the built-in <code>switch</code> component consists of various platform in <a href="https://github.com/home-assistant/home-assistant/tree/master/homeassistant/components/switch"><code>homeassistant/components/switch/</code></a>. The file <code>__init__.py</code> contains the core logic of all platform and the <code>vendor_name.py</code> files only the relevant platform code.</p>
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<p>If you are planning to add support for a new type of device to an existing component, you can get away with only writing platform logic. Have a look at how the component works with other platforms and create a similar file for the platform that you would like to add:</p>
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<ul>
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<li><a href="/developers/platform_example_sensor">Example sensor platform</a>: hello world of platforms.</li>
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<li><a href="/developers/platform_example_light">Example light platform</a>: showing best practices.</li>
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</ul>
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<h3><a class="title-link" name="interfacing-with-devices" href="#interfacing-with-devices"></a> Interfacing with devices</h3>
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<p>One of the rules for Home Assistant is that platform logic should never interface directly with devices but use a third-party Python 3 library to do so. This way Home Assistant is able to share code with the Python community and we can keep the project maintainable.</p>
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<p>To integrate the third-party library you create an Entity class for your device. Entities are Home Assistant’s representation of lights, switches, sensors, etc. and are derived from the <a href="https://github.com/home-assistant/home-assistant/blob/master/homeassistant/helpers/entity.py">Entity Abstract Class</a>. This abstract class contains logic for integrating most standard features into your entities, such as visibility, entity IDs, updates, and much more.</p>
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<h3><a class="title-link" name="requirements-and-dependencies" href="#requirements-and-dependencies"></a> Requirements and dependencies</h3>
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<p>Platforms can specify dependencies and requirements the same way as a component does.</p>
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<div class="highlighter-coderay"><div class="CodeRay">
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<div class="code"><pre>REQUIREMENTS = [<span class="string"><span class="delimiter">'</span><span class="content">some-package==2.0.0</span><span class="delimiter">'</span></span>, <span class="string"><span class="delimiter">'</span><span class="content">some-other-package==2.5.0</span><span class="delimiter">'</span></span>]
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DEPENDENCIES = [<span class="string"><span class="delimiter">'</span><span class="content">mqtt</span><span class="delimiter">'</span></span>]
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</pre></div>
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</div>
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<div class='edit-github'><a href='https://github.com/home-assistant/home-assistant.io/tree/master/source/developers/add_new_platform.markdown'>Edit this page on GitHub</a></div>
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<h1 class="title delta">Development Guide</h1>
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<a href='/developers/'>Introduction </a>
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<li><a href='/developers/architecture/'>Architecture </a></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_testing/'>Testing </a></li>
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<li><a href='/developers/development_catching_up/'>Catching up with Reality </a></li>
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</ul>
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</li>
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<li>
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<a class='active' href='/developers/add_new_platform/'>Support a new device (as a platform) </a>
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<ul>
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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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</li>
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<li>
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<a href='/developers/creating_components/'>Adding a new component </a>
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<ul>
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<li><a href='/developers/component_loading/'>Loading components </a></li>
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<li><a href='/developers/component_deps_and_reqs/'>Requirements & Dependencies </a></li>
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<li><a href='/developers/component_initialization/'>Initialization </a></li>
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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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<li><a href='/developers/component_visibility/'>Visibility </a></li>
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<li><a href='/developers/component_generic_discovery/'>Loading Platforms </a></li>
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<li><a href='/developers/component_discovery/'>Component Discovery </a></li>
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</ul>
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</li>
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<li>
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Frontend Development
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<ul>
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<li><a href='/developers/frontend/'>Setup Frontend Environment </a></li>
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<li>
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API
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<ul>
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<li><a href='/developers/helpers/'>Online helpers </a></li>
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<li><a href='/developers/multiple_instances/'>Multiple Instances </a></li>
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<li><a href='/developers/website/'>Home-Assistant.io </a></li>
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<li><a href='/developers/credits/'>Credits </a></li>
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</section>
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