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<h1 class="title indent">
BH1750 Light sensor
</h1>
</header>
<hr class="divider">
<p>The <code class="highlighter-rouge">bh1750</code> sensor platform allows you to read the ambient light level in Lux from a <a href="http://cpre.kmutnb.ac.th/esl/learning/bh1750-light-sensor/bh1750fvi-e_datasheet.pdf">BH1750FVI sensor</a> connected via <a href="https://en.wikipedia.org/wiki/I²C">I2c</a> bus (SDA, SCL pins). It allows you to use all the resolution modes of the sensor described in its datasheet.</p>
<p>Tested devices:</p>
<ul>
<li><a href="https://www.raspberrypi.org/">Raspberry Pi</a></li>
</ul>
<p>To use your BH1750 sensor in your installation, add the following to your <code class="highlighter-rouge">configuration.yaml</code> file:</p>
<div class="language-yaml highlighter-rouge"><pre class="highlight"><code><span class="c1"># Example configuration.yaml entry</span>
<span class="s">sensor</span><span class="pi">:</span>
<span class="pi">-</span> <span class="s">platform</span><span class="pi">:</span> <span class="s">bh1750</span>
</code></pre>
</div>
<p>Configuration variables:</p>
<ul>
<li><strong>name</strong> (<em>Optional</em>): The name of the sensor</li>
<li><strong>i2c_address</strong> (<em>Optional</em>): I2c address of the sensor. It is 0x23 or 0x5C.</li>
<li><strong>i2c_bus</strong> (<em>Optional</em>): I2c bus where the sensor is. Defaults to 1, for Raspberry Pi 2 and 3.</li>
<li><strong>operation_mode</strong> (<em>Optional</em>): Working mode for the sensor. Defaults to <code class="highlighter-rouge">continuous_high_res_mode_1</code> for continuous measurement and 1 lx resolution.</li>
<li><strong>measurement_delay_ms</strong> (<em>Optional</em>): Delay time in ms for waiting the sensor to get the measure. Defaults to 120 ms.</li>
<li><strong>multiplier</strong> (<em>Optional</em>): Correction coefficient to multiply the measured light level. Value between 0.1 and 10. Default is 1.</li>
</ul>
<h2><a class="title-link" name="full-examples" href="#full-examples"></a> Full Examples</h2>
<p>If you want to specify the resolution mode of the digital sensor or need to change the default I2c address (which is 0x23), add more details to the <code class="highlighter-rouge">configuration.yaml</code> file.</p>
<p>The sensor can work with resolutions of 0.5 lx (high res mode 1), 1 lx (high res mode 2) or 4 lx (low res mode), and make measurements continuously or one time each call. To set any of these operation modes, select one of these combinations: <code class="highlighter-rouge">continuous_low_res_mode</code>, <code class="highlighter-rouge">continuous_high_res_mode_2</code>, <code class="highlighter-rouge">continuous_high_res_mode_1</code>, <code class="highlighter-rouge">one_time_high_res_mode_1</code>, <code class="highlighter-rouge">one_time_high_res_mode_2</code>, <code class="highlighter-rouge">one_time_low_res_mode</code>.</p>
<div class="language-yaml highlighter-rouge"><pre class="highlight"><code><span class="c1"># Example of customized configuration.yaml entry</span>
<span class="s">sensor</span><span class="pi">:</span>
<span class="pi">-</span> <span class="s">platform</span><span class="pi">:</span> <span class="s">bh1750</span>
<span class="s">name</span><span class="pi">:</span> <span class="s">Ambient light</span>
<span class="s">i2c_address</span><span class="pi">:</span> <span class="s">0x5C</span>
<span class="s">operation_mode</span><span class="pi">:</span> <span class="s">one_time_high_res_mode_1</span>
<span class="s">measurement_delay_ms</span><span class="pi">:</span> <span class="s">200</span>
<span class="s">scan_interval</span><span class="pi">:</span> <span class="s">25</span>
</code></pre>
</div>
<h2><a class="title-link" name="directions-for-installing-smbus-support-on-raspberry-pi" href="#directions-for-installing-smbus-support-on-raspberry-pi"></a> Directions for installing smbus support on Raspberry Pi</h2>
<p>Enable I2c interface with the Raspberry Pi configuration utility:</p>
<div class="language-bash highlighter-rouge"><pre class="highlight"><code><span class="c"># pi user environment: Enable i2c interface</span>
<span class="gp">$ </span>sudo raspi-config
</code></pre>
</div>
<p>Select <code class="highlighter-rouge">Interfacing options-&gt;I2C</code> choose <code class="highlighter-rouge">&lt;Yes&gt;</code> and hit <code class="highlighter-rouge">Enter</code>, then go to <code class="highlighter-rouge">Finish</code> and youll be prompted to reboot.</p>
<p>Install dependencies for use the <code class="highlighter-rouge">smbus-cffi</code> module and enable your <em>homeassistant</em> user to join the <em>i2c</em> group:</p>
<div class="language-bash highlighter-rouge"><pre class="highlight"><code><span class="c"># pi user environment: Install i2c dependencies and utilities</span>
<span class="gp">$ </span>sudo apt-get install build-essential libi2c-dev i2c-tools python-dev libffi-dev
<span class="c"># pi user environment: Add homeassistant user to the i2c group</span>
<span class="gp">$ </span>sudo addgroup homeassistant i2c
<span class="c"># pi user environment: Reboot Raspberry Pi to apply changes</span>
<span class="gp">$ </span>sudo reboot
</code></pre>
</div>
<h3><a class="title-link" name="check-the-i2c-address-of-the-sensor" href="#check-the-i2c-address-of-the-sensor"></a> Check the i2c address of the sensor</h3>
<p>After installing <code class="highlighter-rouge">i2c-tools</code>, a new utility is available to scan the addresses of the connected sensors:</p>
<div class="language-bash highlighter-rouge"><pre class="highlight"><code><span class="gp">$ </span>/usr/sbin/i2cdetect -y 1
</code></pre>
</div>
<p>It will output a table like this:</p>
<div class="language-text highlighter-rouge"><pre class="highlight"><code> 0 1 2 3 4 5 6 7 8 9 a b c d e f
00: -- -- -- -- -- -- -- -- -- -- -- -- --
10: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
20: -- -- -- 23 -- -- -- -- -- -- -- -- -- -- -- --
30: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
40: 40 -- -- -- -- -- UU -- -- -- -- -- -- -- -- --
50: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
60: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
70: -- -- -- -- -- -- -- 77
</code></pre>
</div>
<p>So you can see the sensor address what you are looking for is <strong>0x23</strong> (there are more i2c sensors in that Raspberry Pi).</p>
</article>
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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>: Local Push
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Introduced in release: 0.48
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Source:
<a href='https://github.com/home-assistant/home-assistant/blob/master/homeassistant/components/sensor/bh1750.py'>sensor/bh1750.py</a>
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<div class='section'>
<h1 class="title delta">Category Sensor</h1>
<ul class='divided'>
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<a href='/components/sensor.android_ip_webcam/'>Android IP Webcam Sensor</a>
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<a href='/components/sensor.arlo/'>Arlo Sensor</a>
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BH1750 Light sensor
</li>
<li>
<a href='/components/sensor.bme280/'>BME280 Sensor</a>
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<a href='/components/sensor.bme680/'>BME680 Sensor</a>
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<a href='/components/sensor.bmw_connected_drive/'>BMW connected drive</a>
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<a href='/components/sensor.blink/'>Blink Sensor</a>
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<a href='/components/sensor.bloomsky/'>BloomSky Sensor</a>
</li>
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<a href='/components/sensor.broadlink/'>Broadlink RM2 and A1 sensor</a>
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<a href='/components/sensor.modem_callerid/'>Caller ID Sensor</a>
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<a href='/components/sensor.canary/'>Canary Sensor</a>
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<a href='/components/sensor.dnsip/'>DNS IP</a>
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<a href='/components/sensor.daikin/'>Daikin AC</a>
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<a href='/components/sensor.dweet/'>Dweet.io</a>
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<a href='/components/sensor.dyson/'>Dyson Purifier Sensor</a>
</li>
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<a href='/components/sensor.ebox/'>EBox</a>
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<a href='/components/sensor.eight_sleep/'>Eight Sleep Sensor</a>
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<a href='/components/sensor.emoncms/'>Emoncms Sensor</a>
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<a href='/components/sensor.enocean/'>EnOcean Sensor</a>
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<a href='/components/sensor.envirophat/'>Enviro pHAT</a>
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<a href='/components/sensor.envisalink/'>Envisalink Sensor</a>
</li>
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<a href='/components/sensor.fail2ban/'>Fail2Ban Sensor</a>
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<a href='/components/sensor.file/'>File Sensor</a>
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<a href='/components/sensor.filesize/'>File size sensor</a>
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<a href='/components/sensor.hive/'>Hive Sensor</a>
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<a href='/components/sensor.homematic/'>Homematic Sensor</a>
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<li>
<a href='/components/sensor.ihc/'>IHC Sensor</a>
</li>
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<a href='/components/sensor.imap_email_content/'>IMAP Email Content</a>
</li>
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<a href='/components/sensor.imap/'>IMAP Unread E-mail</a>
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<a href='/components/sensor.insteon_plm/'>Insteon PLM Sensor</a>
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<a href='/components/sensor.juicenet/'>Juicenet Sensor</a>
</li>
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<a href='/components/sensor.knx/'>KNX Sensor</a>
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<a href='/components/sensor.kwb/'>KWB Easyfire Sensor</a>
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<a href='/components/sensor.octoprint/'>OctoPrint Sensor</a>
</li>
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<a href='/components/sensor.openevse/'>OpenEVSE Sensor</a>
</li>
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</li>
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</li>
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<a href='/components/sensor.qnap/'>QNAP Sensor</a>
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<a href='/components/sensor.rest/'>RESTful Sensor</a>
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<a href='/components/sensor.rflink/'>RFLink Sensor</a>
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</li>
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</li>
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<a href='/components/sensor.scrape/'>Scrape Sensor</a>
</li>
<li>
<a href='/components/sensor.season/'>Season Sensor</a>
</li>
<li>
<a href='/components/sensor.sensehat/'>Sense HAT</a>
</li>
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<a href='/components/sensor.serial/'>Serial Sensor</a>
</li>
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</li>
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</li>
<li>
<a href='/components/sensor.sonarr/'>Sonarr Sensor</a>
</li>
<li>
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</li>
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<a href='/components/sensor.startca/'>Start.ca</a>
</li>
<li>
<a href='/components/sensor.statistics/'>Statistics Sensor</a>
</li>
<li>
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</li>
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</li>
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</li>
<li>
<a href='/components/sensor.tado/'>Tado Sensor</a>
</li>
<li>
<a href='/components/sensor.tahoma/'>Tahoma Sensor</a>
</li>
<li>
<a href='/components/sensor.tank_utility/'>Tank Utility Sensor</a>
</li>
<li>
<a href='/components/sensor.teksavvy/'>TekSavvy</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.tesla/'>Tesla Sensor</a>
</li>
<li>
<a href='/components/sensor.thethingsnetwork/'>The Things Network Sensor</a>
</li>
<li>
<a href='/components/sensor.thinkingcleaner/'>Thinking Cleaner sensor</a>
</li>
<li>
<a href='/components/sensor.tibber/'>Tibber</a>
</li>
<li>
<a href='/components/sensor.toon/'>Toon Sensor</a>
</li>
<li>
<a href='/components/sensor.travisci/'>Travis-CI Sensor</a>
</li>
<li>
<a href='/components/sensor.ups/'>UPS Sensor</a>
</li>
<li>
<a href='/components/sensor.usps/'>USPS Sensor</a>
</li>
<li>
<a href='/components/sensor.uptime/'>Uptime Sensor</a>
</li>
<li>
<a href='/components/sensor.vera/'>Vera Sensor</a>
</li>
<li>
<a href='/components/sensor.verisure/'>Verisure Sensor</a>
</li>
<li>
<a href='/components/sensor.version/'>Version Sensor</a>
</li>
<li>
<a href='/components/sensor.whois/'>Whois Sensor</a>
</li>
<li>
<a href='/components/sensor.wink/'>Wink Sensor</a>
</li>
<li>
<a href='/components/sensor.xiaomi_aqara/'>Xiaomi Sensor</a>
</li>
<li>
<a href='/components/sensor.zwave/'>Z-Wave Sensor</a>
</li>
<li>
<a href='/components/sensor.comfoconnect/'>Zehnder ComfoAir Q Ventilation sensors</a>
</li>
<li>
<a href='/components/sensor.zestimate/'>Zestimate</a>
</li>
<li>
<a href='/components/sensor.zha/'>ZigBee Home Automation Sensor</a>
</li>
<li>
<a href='/components/sensor.zigbee/'>ZigBee Sensor</a>
</li>
<li>
<a href='/components/sensor.zoneminder/'>ZoneMinder Sensor</a>
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<a href='/components/sensor.arest/'>aREST Sensor</a>
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<a href='/components/sensor.deconz/'>deCONZ Sensor</a>
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<a href='/components/sensor.mfi/'>mFi Sensor</a>
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