Site updated at 2016-08-31 05:05:07 UTC
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<title><![CDATA[Category: Micropython | Home Assistant]]></title>
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<link href="https://home-assistant.io/blog/categories/micropython/atom.xml" rel="self"/>
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<link href="https://home-assistant.io/"/>
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<updated>2016-08-30T21:57:10+00:00</updated>
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<updated>2016-08-31T05:03:39+00:00</updated>
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<id>https://home-assistant.io/</id>
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<author>
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<name><![CDATA[Home Assistant]]></name>
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@ -13,6 +13,108 @@
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<generator uri="http://octopress.org/">Octopress</generator>
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<entry>
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<title type="html"><![CDATA[ESP8266 and MicroPython - Part 2]]></title>
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<link href="https://home-assistant.io/blog/2016/08/31/esp8266-and-micropython-part2/"/>
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<updated>2016-08-31T04:17:25+00:00</updated>
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<id>https://home-assistant.io/blog/2016/08/31/esp8266-and-micropython-part2</id>
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<content type="html">< was pretty lame, right? Instead of getting information out of Home Assistant we are going a step forward and create our own sensor which is sending details about its state to a Home Assistant instance.
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<!--more-->
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Beside [HTTP POST](https://en.wikipedia.org/wiki/POST_(HTTP)) requests, MQTT is the quickest way (from the author's point of view) to publish information with DIY devices.
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You have to make a decision: Do you want to pull or to poll? For slowly changing values like temperature it's perfectly fine to wait a couple of seconds to retrieve the value. If it's a motion detector the state change should be available instantly. This means the sensor must take initiative.
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An example for pulling is [aREST](/components/sensor.arest/). This is a great way to work with the ESP8266 based units and the Ardunio IDE.
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### <a class='title-link' name='mqtt' href='#mqtt'></a> MQTT
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You can find a simple examples for publishing and subscribing with MQTT in the [MicroPython](https://github.com/micropython/micropython-lib) library overview in the section for [umqtt](https://github.com/micropython/micropython-lib/tree/master/umqtt.simple).
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The example below is adopted from the work of [@davea](https://github.com/davea) as we don't want to re-invent the wheel. The configuration feature is crafty and simplyfies the code with the usage of a file called `/config.json` which stores the configuration details. The ESP8266 device will send the value of a pin every 5 seconds.
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```python
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import machine
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import time
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import ubinascii
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import webrepl
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from umqtt.simple import MQTTClient
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# These defaults are overwritten with the contents of /config.json by load_config()
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CONFIG = {
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"broker": "192.168.1.19",
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"sensor_pin": 0,
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"client_id": b"esp8266_" + ubinascii.hexlify(machine.unique_id()),
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"topic": b"home",
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}
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client = None
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sensor_pin = None
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def setup_pins():
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global sensor_pin
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sensor_pin = machine.ADC(CONFIG['sensor_pin'])
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def load_config():
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import ujson as json
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try:
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with open("/config.json") as f:
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config = json.loads(f.read())
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except (OSError, ValueError):
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print("Couldn't load /config.json")
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save_config()
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else:
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CONFIG.update(config)
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print("Loaded config from /config.json")
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def save_config():
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import ujson as json
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try:
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with open("/config.json", "w") as f:
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f.write(json.dumps(CONFIG))
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except OSError:
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print("Couldn't save /config.json")
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def main():
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client = MQTTClient(CONFIG['client_id'], CONFIG['broker'])
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client.connect()
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print("Connected to {}".format(CONFIG['broker']))
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while True:
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data = sensor_pin.read()
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client.publish('{}/{}'.format(CONFIG['topic'],
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CONFIG['client_id']),
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bytes(str(data), 'utf-8'))
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print('Sensor state: {}'.format(data))
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time.sleep(5)
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if __name__ == '__main__':
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load_config()
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setup_pins()
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main()
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```
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Subscribe to the topic `home/#` or create a [MQTT sensor](/components/sensor.mqtt/) to check if the sensor values are published.
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```bash
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$ mosquitto_sub -h 192.168.1.19 -v -t "home/#"
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```
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```yaml
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sensor:
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- platform: mqtt
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state_topic: "home/esp8266_[last part of the MAC address]"
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name: "MicroPython"
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```
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[@davea](https://github.com/davea) created [sonoff-mqtt](https://github.com/davea/sonoff-mqtt). This code will work on ESP8622 based devices too and shows how to use a button to control a relay.
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]]></content>
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</entry>
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<entry>
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<title type="html"><![CDATA[ESP8266 and MicroPython - Part 1]]></title>
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<link href="https://home-assistant.io/blog/2016/07/28/esp8266-and-micropython-part1/"/>
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@ -98,6 +98,44 @@
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<h2>2016</h2>
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<article>
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<div class="grid">
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<div class="grid__item one-fifth palm-one-whole">
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<time datetime="2016-08-31T04:17:25+00:00" pubdate>
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<span class='month'>Aug</span> <span class='day'>31</span>
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</time>
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</div>
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<div class="grid__item four-fifths palm-one-whole">
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<h1 class="gamma"><a href="/blog/2016/08/31/esp8266-and-micropython-part2/">ESP8266 and MicroPython - Part 2</a></h1>
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<footer class="meta">
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<span>
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<i class="icon-tags"></i>
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<ul class="tags unstyled">
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<li><a class='category' href='/blog/categories/esp8266/'>ESP8266</a></li>
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<li><a class='category' href='/blog/categories/how-to/'>How-To</a></li>
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<li><a class='category' href='/blog/categories/mqtt/'>MQTT</a></li>
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<li><a class='category' href='/blog/categories/micropython/'>Micropython</a></li>
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</ul>
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</span>
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</footer>
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<hr class="divider">
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</div>
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</div>
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</article>
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<article>
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<div class="grid">
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@ -189,6 +227,12 @@
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<ul class="divided">
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<li class="post">
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<a href="/blog/2016/08/31/esp8266-and-micropython-part2/">ESP8266 and MicroPython - Part 2</a>
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</li>
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<li class="post">
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<a href="/blog/2016/08/28/notifications-hue-fake-unification/">0.27 is here to break eggs and take names: notifications, Hue fakery, safety and unification come to Home Assistant</a>
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</li>
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@ -212,12 +256,6 @@
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</li>
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<li class="post">
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<a href="/blog/2016/08/07/optimizing-the-home-assistant-mobile-web-app/">Optimizing the Home Assistant mobile web app</a>
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</li>
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</ul>
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</section>
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