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144 lines
5.1 KiB
HTML
144 lines
5.1 KiB
HTML
<!doctype html>
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<head>
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<meta charset="utf-8">
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<meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1">
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<title>architecture - Home Assistant</title>
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<meta name="author" content="Paulus Schoutsen">
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<meta name="description" content="Home Assistant is an open-source home automation platform running on Python 3.">
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<link rel="canonical" href="http://balloob.github.io/home-assistant/architecture">
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<link href="/home-assistant/github/atom.xml" rel="alternate" title="Home Assistant" type="application/atom+xml">
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</head>
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<body >
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<header>
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<div class="grid-wrapper">
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<div class="grid">
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<div class="grid__item three-tenths lap-four-sixths palm-one-whole">
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<a href="/home-assistant/" class="site-title">Home Assistant</a>
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</div>
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<nav>
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<input type="checkbox" id="toggle">
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<label for="toggle" class="toggle" data-open="Main Menu" data-close="Close Menu"></label>
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<ul class="menu pull-right">
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<li><a href="/home-assistant/getting-started">Getting started</a></li>
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<li><a href="/home-assistant/architecture">Architecture</a></li>
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<li><a href="/home-assistant/contributing">Contributing</a></li>
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<li><a href="/home-assistant/blog/2014/12/18/website-launched/">Blog</a></li>
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<li><a href="https://groups.google.com/forum/#!forum/home-assistant-dev">Need help?</a></li>
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<div class="grid__item two-thirds lap-one-whole palm-one-whole">
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<article class="page">
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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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</header>
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<hr class="divider">
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<p><img src='/home-assistant/images/ha_architecture.png' style='background-color: white'/></p>
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<p>The core of Home Assistant exists of the following parts.</p>
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<p>The <b>Event Bus</b> facilitates the firing and listening of events. This is the beating heart of Home Assistant.</p>
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<p>The <b>State Machine</b> keeps track of the states of things. Fires a state_changed event when a state has been changed.</p>
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<p>The <b>Service Registry</b> listens on the event bus for call_service events and allows other code to register services.</p>
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<p>The <b>Timer</b> will send every 10 seconds a time_changed event on the event bus.</p>
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<p>Take for example the device_tracker component. This component is responsible for keeping track which devices are home. It checks which devices are home every time a time_changed event is fired on the event bus. It will then update the state machine with the information for each device.</p>
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<p>This setup allows us to create simple yet powerful logic for controlling your home:</p>
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<pre><code>In the event that the state of device 'Paulus Nexus 5' changes to the 'Home' state:
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If the sun has set and the lights are not on:
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Turn on the lights
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In the event that the combined state of all tracked devices changes to 'Not Home':
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If the lights are on:
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Turn off the lights
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In the event of the sun setting:
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If the lights are off and the combined state of all tracked device equals 'Home':
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Turn on the lights
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</code></pre>
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<p>By using the Bus as a central communication hub between components it is easy to replace components or add functionality. If you would want to change the way devices are detected you only have to write a component that updates the device states in the State Machine.</p>
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</article>
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</div>
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<footer>
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<p class="copyright">
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All content by Paulus Schoutsen and licenced under <a href="//creativecommons.org/licenses/by-nc-sa/3.0/ie/">Creative Commons</a>.<br>
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Code under <a href="//github.com/coogie/oscailte/blob/master/README.md">MIT Licence</a>. <span class="credit">Site powered by <a href="http://octopress.org">Octopress</a></span>
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