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MQTT Sensor
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</h1>
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<p>This <code>mqtt</code> sensor platform uses the MQTT message payload as the sensor value. If messages in this <code>state_topic</code> are published with <em>RETAIN</em> flag, the sensor will receive an instant update with last known value. Otherwise, the initial state will be undefined.</p>
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<p>To use your MQTT sensor in your installation, add the following to your <code>configuration.yaml</code> file:</p>
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<div class="highlighter-coderay"><div class="CodeRay">
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<div class="code"><pre><span class="comment"># Example configuration.yml entry</span>
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<span class="key">sensor</span>:
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<span class="key">platform</span>: <span class="string"><span class="content">mqtt</span></span>
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<span class="key">state_topic</span>: <span class="string"><span class="delimiter">"</span><span class="content">home/bedroom/temperature</span><span class="delimiter">"</span></span>
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<span class="key">name</span>: <span class="string"><span class="delimiter">"</span><span class="content">MQTT Sensor</span><span class="delimiter">"</span></span>
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<span class="key">qos</span>: <span class="string"><span class="content">0</span></span>
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<span class="key">unit_of_measurement</span>: <span class="string"><span class="delimiter">"</span><span class="content">°C</span><span class="delimiter">"</span></span>
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<span class="key">value_template</span>: <span class="string"><span class="content">'{{ value.x }}'</span></span>
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</pre></div>
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</div>
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</div>
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<p>Configuration variables:</p>
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<ul>
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<li><strong>state_topic</strong> (<em>Required</em>): The MQTT topic subscribed to receive sensor values.</li>
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<li><strong>name</strong> (<em>Optional</em>): The name of the sensor. Default is ‘MQTT Sensor’.</li>
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<li><strong>qos</strong> (<em>Optional</em>): The maximum QoS level of the state topic. Default is 0.</li>
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<li><strong>unit_of_measurement</strong> (<em>Optional</em>): Defines the units of measurement of the sensor, if any.</li>
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<li><strong>value_template</strong> (<em>Optional</em>): Defines a <a href="/topics/templating/">template</a> to extract a value from the payload.</li>
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</ul>
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<h2><a class="title-link" name="examples" href="#examples"></a> Examples</h2>
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<p>In this section you find some real life examples of how to use this sensor.</p>
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<h3><a class="title-link" name="get-battery-level" href="#get-battery-level"></a> Get battery level</h3>
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<p>If you are using the <a href="/components/device_tracker.owntracks/">Owntracks</a> and enable the reporting of the battery level then you can use a MQTT sensor to keep track of your battery. A regular MQTT message from Owntracks looks like this:</p>
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<div class="highlighter-coderay"><div class="CodeRay">
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<div class="code"><pre>owntracks/tablet/tablet {"_type":"location","lon":7.21,"t":"u","batt":92,"tst":144995643,"tid":"ta","acc":27,"lat":46.12}
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</pre></div>
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</div>
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</div>
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<p>Thus the trick is extract the battery level from the payload.</p>
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<div class="highlighter-coderay"><div class="CodeRay">
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<div class="code"><pre><span class="comment"># Example configuration.yml entry</span>
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<span class="key">sensor</span>:
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<span class="key">platform</span>: <span class="string"><span class="content">mqtt</span></span>
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<span class="key">state_topic</span>: <span class="string"><span class="delimiter">"</span><span class="content">owntracks/tablet/tablet</span><span class="delimiter">"</span></span>
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<span class="key">name</span>: <span class="string"><span class="delimiter">"</span><span class="content">Battery Tablet</span><span class="delimiter">"</span></span>
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<span class="key">unit_of_measurement</span>: <span class="string"><span class="delimiter">"</span><span class="content">%</span><span class="delimiter">"</span></span>
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<span class="key">value_template</span>: <span class="string"><span class="content">'{{ value_json.batt }}'</span></span>
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</pre></div>
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</div>
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</div>
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<h3><a class="title-link" name="get-temperature-and-humidity" href="#get-temperature-and-humidity"></a> Get temperature and humidity</h3>
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<p>If you are using a DHT sensor and a NodeMCU board (esp8266), you can retrieve temperature and humidity with a MQTT sensor. A code example can be found <a href="https://github.com/mertenats/open-home-automation/tree/master/ha_mqtt_sensor_dht22">here</a>. A regular MQTT message from this example looks like this:</p>
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<pre><code>office/sensor1
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{
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"temperature": 23.20,
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"humidity": 43.70
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}
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</code></pre>
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<p>Then use this configuration example to extract the data from the payload:</p>
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<div class="highlighter-coderay"><div class="CodeRay">
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<div class="code"><pre><span class="comment"># Example configuration.yml entry</span>
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<span class="key">sensor 1</span>:
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<span class="key">platform</span>: <span class="string"><span class="content">mqtt</span></span>
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<span class="key">state_topic</span>: <span class="string"><span class="content">'office/sensor1'</span></span>
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<span class="key">name</span>: <span class="string"><span class="content">'Temperature'</span></span>
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<span class="key">unit_of_measurement</span>: <span class="string"><span class="content">'°C'</span></span>
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<span class="key">value_template</span>: <span class="string"><span class="content">''</span></span>
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<span class="key">sensor 2</span>:
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<span class="key">platform</span>: <span class="string"><span class="content">mqtt</span></span>
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<span class="key">state_topic</span>: <span class="string"><span class="content">'office/sensor1'</span></span>
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<span class="key">name</span>: <span class="string"><span class="content">'Humidity'</span></span>
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<span class="key">unit_of_measurement</span>: <span class="string"><span class="content">'%'</span></span>
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<span class="key">value_template</span>: <span class="string"><span class="content">''</span></span>
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</pre></div>
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</div>
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</div>
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</article>
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<aside id="sidebar" class="grid__item one-third lap-one-whole palm-one-whole">
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<div class="grid">
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<section class="aside-module grid__item one-whole lap-one-half">
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<div class='edit-github'><a href='https://github.com/home-assistant/home-assistant.io/tree/master/source/_components/sensor.mqtt.markdown'>Edit this page on GitHub</a></div>
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<div class='brand-logo-container section'>
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<img src='/images/supported_brands/mqtt.png' />
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</div>
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<div class='section'>
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IoT class<sup><a href='/blog/2016/02/12/classifying-the-internet-of-things/#classifiers'><i class="icon-info-sign"></i></a></sup>: depends
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</div>
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<div class='section'>
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Introduced in release: 0.7
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</div>
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<div class='section'>
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<h1 class='title delta'>Related components</h1>
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<ul class='divided'>
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<li><a href='/components/mqtt/'>
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MQTT
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</a></li>
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<li><a href='/components/alarm_control_panel.mqtt/'>
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MQTT Alarm Control Panel
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</a></li>
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<li><a href='/components/binary_sensor.mqtt/'>
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MQTT Binary Sensor
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</a></li>
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<li><a href='/components/device_tracker.mqtt/'>
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MQTT Device Tracker
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</a></li>
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<li><a href='/components/garage_door.mqtt/'>
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MQTT Garage door
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</a></li>
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<li><a href='/components/light.mqtt/'>
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MQTT Light
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</a></li>
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<li><a href='/components/lock.mqtt/'>
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MQTT Lock
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</a></li>
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<li><a href='/components/notify.mqtt/'>
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MQTT Notifications
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</a></li>
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<li><a href='/components/rollershutter.mqtt/'>
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MQTT Rollershutter
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</a></li>
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<li><a href='/components/switch.mqtt/'>
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MQTT Switch
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</a></li>
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</ul>
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</div>
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<div class='section'>
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<h1 class="title delta">Category Sensor</h1>
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<ul class='divided'>
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<li>
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<a href='/components/sensor.apcupsd/'>APCUPSd Sensor</a>
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||
</li>
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<li>
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<a href='/components/sensor.bitcoin/'>Bitcoin</a>
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||
</li>
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||
<li>
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<a href='/components/sensor.bloomsky/'>BloomSky Sensor</a>
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</li>
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<li>
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<a href='/components/sensor.cpuspeed/'>CPU speed</a>
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</li>
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<li>
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<a href='/components/sensor.command_line/'>Command line Sensor</a>
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||
</li>
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<li>
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<a href='/components/sensor.dte_energy_bridge/'>DTE Energy Bridge</a>
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||
</li>
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<li>
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<a href='/components/sensor.deutsche_bahn/'>Deutsche Bahn</a>
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</li>
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<li>
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<a href='/components/sensor.dweet/'>Dweet.io</a>
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</li>
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||
<li>
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<a href='/components/sensor.ecobee/'>Ecobee Sensor</a>
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||
</li>
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<li>
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<a href='/components/sensor.efergy/'>Efergy</a>
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||
</li>
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||
<li>
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||
<a href='/components/sensor.eliqonline/'>Eliqonline</a>
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</li>
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<li>
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<a href='/components/sensor.enocean/'>EnOcean Sensor</a>
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||
</li>
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||
<li>
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||
<a href='/components/sensor.fitbit/'>Fitbit</a>
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||
</li>
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||
<li>
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||
<a href='/components/sensor.fixer/'>Fixer.io</a>
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||
</li>
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||
<li>
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<a href='/components/sensor.glances/'>Glances</a>
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||
</li>
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||
<li>
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<a href='/components/sensor.google_travel_time/'>Google Maps Travel Time</a>
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||
</li>
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<li>
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<a href='/components/sensor.http/'>HTTP Sensor</a>
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</li>
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||
<li>
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<a href='/components/sensor.homematic/'>Homematic Sensor</a>
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||
</li>
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<li>
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<a href='/components/sensor.imap/'>IMAP Sensor</a>
|
||
</li>
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||
<li>
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||
<a href='/components/sensor.lastfm/'>Last.fm</a>
|
||
</li>
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||
<li>
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<a href='/components/sensor.loop_energy/'>Loop Energy</a>
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||
</li>
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<li>
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MQTT Sensor
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</li>
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<li>
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||
<a href='/components/sensor.modbus/'>Modbus Sensor</a>
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||
</li>
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||
<li>
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||
<a href='/components/sensor.moldindicator/'>Mold Indicator</a>
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||
</li>
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||
<li>
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||
<a href='/components/sensor.mysensors/'>MySensors Sensor</a>
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||
</li>
|
||
<li>
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||
<a href='/components/sensor.nzbget/'>NZBGet</a>
|
||
</li>
|
||
<li>
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||
<a href='/components/sensor.nest/'>Nest Sensor</a>
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||
</li>
|
||
<li>
|
||
<a href='/components/sensor.neurio_energy/'>Neurio</a>
|
||
</li>
|
||
<li>
|
||
<a href='/components/sensor.octoprint/'>OctoPrint Sensor</a>
|
||
</li>
|
||
<li>
|
||
<a href='/components/sensor.onewire/'>One wire Sensor</a>
|
||
</li>
|
||
<li>
|
||
<a href='/components/sensor.openexchangerates/'>Open Exchange Rates</a>
|
||
</li>
|
||
<li>
|
||
<a href='/components/sensor.plex/'>Plex Sensor</a>
|
||
</li>
|
||
<li>
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||
<a href='/components/sensor.gtfs/'>Public Transit (GTFS)</a>
|
||
</li>
|
||
<li>
|
||
<a href='/components/sensor.rest/'>RESTful Sensor</a>
|
||
</li>
|
||
<li>
|
||
<a href='/components/sensor.rfxtrx/'>RFXtrx Sensor</a>
|
||
</li>
|
||
<li>
|
||
<a href='/components/sensor.sabnzbd/'>SABnzbd</a>
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||
</li>
|
||
<li>
|
||
<a href='/components/sensor.snmp/'>SNMP</a>
|
||
</li>
|
||
<li>
|
||
<a href='/components/sensor.speedtest/'>Speedtest.net</a>
|
||
</li>
|
||
<li>
|
||
<a href='/components/sensor.steam_online/'>Steam</a>
|
||
</li>
|
||
<li>
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||
<a href='/components/sensor.supervisord/'>Supervisord</a>
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||
</li>
|
||
<li>
|
||
<a href='/components/sensor.swiss_hydrological_data/'>Swiss Hydrological Data</a>
|
||
</li>
|
||
<li>
|
||
<a href='/components/sensor.swiss_public_transport/'>Swiss Public Transport</a>
|
||
</li>
|
||
<li>
|
||
<a href='/components/sensor.systemmonitor/'>System Monitor</a>
|
||
</li>
|
||
<li>
|
||
<a href='/components/sensor.tcp/'>TCP Sensor</a>
|
||
</li>
|
||
<li>
|
||
<a href='/components/sensor.temper/'>TEMPer Sensor</a>
|
||
</li>
|
||
<li>
|
||
<a href='/components/sensor.tellstick/'>TellStick Sensor</a>
|
||
</li>
|
||
<li>
|
||
<a href='/components/sensor.tellduslive/'>Telldus Live sensor</a>
|
||
</li>
|
||
<li>
|
||
<a href='/components/sensor.template/'>Template Sensor</a>
|
||
</li>
|
||
<li>
|
||
<a href='/components/sensor.thinkingcleaner/'>Thinking Cleaner sensor</a>
|
||
</li>
|
||
<li>
|
||
<a href='/components/sensor.time_date/'>Time & Date</a>
|
||
</li>
|
||
<li>
|
||
<a href='/components/sensor.torque/'>Torque (OBD2)</a>
|
||
</li>
|
||
<li>
|
||
<a href='/components/sensor.transmission/'>Transmission Sensor</a>
|
||
</li>
|
||
<li>
|
||
<a href='/components/sensor.twitch/'>Twitch</a>
|
||
</li>
|
||
<li>
|
||
<a href='/components/sensor.uber/'>Uber</a>
|
||
</li>
|
||
<li>
|
||
<a href='/components/sensor.vera/'>Vera Sensor</a>
|
||
</li>
|
||
<li>
|
||
<a href='/components/sensor.envisalink/'>Vera Sensor</a>
|
||
</li>
|
||
<li>
|
||
<a href='/components/sensor.verisure/'>Verisure Sensor</a>
|
||
</li>
|
||
<li>
|
||
<a href='/components/sensor.wink/'>Wink Sensor</a>
|
||
</li>
|
||
<li>
|
||
<a href='/components/sensor.worldclock/'>Worldclock</a>
|
||
</li>
|
||
<li>
|
||
<a href='/components/sensor.zwave/'>Z-Wave Sensor</a>
|
||
</li>
|
||
<li>
|
||
<a href='/components/sensor.zigbee/'>ZigBee Sensor</a>
|
||
</li>
|
||
<li>
|
||
<a href='/components/sensor.arest/'>aREST Sensor</a>
|
||
</li>
|
||
<li>
|
||
<a href='/components/sensor.mfi/'>mFi Sensor</a>
|
||
</li>
|
||
</ul>
|
||
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<div class="copyright">
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<a rel="me" href='https://twitter.com/home_assistant'><i class="icon-twitter"></i></a>
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<a rel="me" href='https://github.com/home-assistant/home-assistant'><i class="icon-github"></i></a>
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Contact us at <a href='mailto:hello@home-assistant.io'>hello@home-assistant.io</a>.<br>
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