I help you achieve great SEO, higher conversions, and help you grow your business, MQTT Discovery with a NodeMCU and Home Assistant, create a simple MQTT switch in Home Assistant. Programming and Deploying Applications with Toit. In November (2020), I started to work with MQTT to set up a few smart devices in Home Assistant. If you don't immediately see your device, you can try searching for your device under the left side bar based on its function. is one of the largest open-source platforms for home automation and is very popular for managing things through IoT. you want it to be shown, then follow the next step. There wasn't anything special about them, just an inexpensive wifi plug switch which works with the Amazon Alexa and Google Assistant. This is because I'm using the "Deep sleep" mode of this NodeMCU to preserve energy. From the Services page, you can select the service "switch.toggle", and from the entity select the plug. When you push the button this time, you should notice a delay before the plug turns on or off. When the server comes back online, you can navigate back over to the overview or unused entities page and you should see your devices added under switches. Immediately, the same message should be received and will appear at the bottom. Thanks for your comment, I am glad that you find this useful. You can change the temperature_topic to your liking but make sure you also reflect this in your HomeAssistant Setup. Connect the ESP32 to your PC via USB-cable and click on Lets start. I break my disovery messages into functions, so I can group them together while not pollution the heart of the Arduino program. A notification should appear on your phone.
The first thing we'll initialize is the broker. Make sure to replace the IP address with the IP of your Pi. Enough talk, let's see some code! Weekly product releases, special offers, and more. With this, Toit is all set and we can begin with programming. To view the available add-ons, click on the Hass.io tab on the left side menu, followed by clicking on the ADD-ON STORE tab along the top as shown below (similarly, you can go to http://hassio.local:8123/hassio/store). If all goes well you should see the Living Room Temperature sensor reading in the overview page similar to the below, your screen might look slightly different from mine: Thats it, please comment below if you have any questions, and subscribe if you like to see the post similar to this. Fill in the information for your WiFi credentials (your WiFi network must be on the same network as the Raspberry Pi), your user name and password for Home Assistant, and the IP address of the Pi. In total, there are 3 sensors on the device right now. And the right leg should be connected to the ground. How can you use MQTT Discovery on an NodeMCU? To create an automation, you can either use the configurator tool to edit the automations.yaml file, or in this case, use the automations tool to generate the code. 
(480x320), http://hassio.local:8123/lovelace/hass-unused-entities, http://hassio.local:8123/config/integrations/dashboard, http://hassio.local:8123/config/automation, Example 1.5: Controlling the ESP32 from Home Assistant, Using Home Assistant to Expand Your Home Automations. Once the network has been setup, insert the SD card and USB stick, if used, into the Pi. Guide for getting going with the Raspberry Pi 3 Model B and Raspberry Pi 3 Model B+ starter kit. For this tutorial, we have set the topic name as. With a constant power source, the amount of current the ESP32 draws isn't much of a concern. By soldering a few more buttons and adding a case, you could create a remote that can turn on and off a bunch of lights, either one at a time, or by groups just by adding more automations and setting each button on the remote to send a different MQTT command. Need to find that next step after mastering the Arduino? To create an automation, select configuration from the left menu bar, and click automation (or go to http://hassio.local:8123/config/automation) and click the "Add Automation" button from the bottom right. In the post that I've linked to in the introduction, I've explained how you can manually tell Mosquitto to listen to a certain topic. Check out some of these related tutorials: Get a background in how WiFi works as well as the hardware available to help you connect your project wirelessly. To get our automation to trigger correctly, we'll want to change our topic to "room/plug" and change the message we're sending to only be "toggle", to match the trigger event of our automation. Finally, make sure the file is saved and restart the Home Assistant server. Took me a while to make it work as Im a newbie but I finally got it . . The cards will appear empty for the first time, so dont worry about that. Connect power to the Pi, and wait for the OS to boot. Now to test whether the broker is working properly, add any sample topic in the publish and listening field (make sure the same topic is in both the fields). Copy and paste the following code into your Arduino IDE and upload to your ESP32. Clicking on the slider will turn the switch on and off. Well it's actually quite similar to coding it manually in Home Assistant. you can quickly set up your ESP32 device using the Web serial interface. The topic name can be as per your choice but should be the same one that weve set in the Home Assistants MQTT sensor config. If you aren't familiar with the following concepts, we recommend checking out these tutorials before continuing. Connect the ESP32 to your PC via USB-cable and click on Lets start. Depending on your setup, you may also need the following. This feature is one of my favorite discoveries recently, so I hope you enjoy it as well! For this tutorial, we have set the topic name as /sensor/sht31. Select homeassistant.restart from the list of service and click on Call Service to restart home assistant. Or on the Hassio SD card first bootable partition, create CONFIG/network/my-network file. If your router doesn't support mDNS, or you're unsure, you'll need to use the IP address of your Pi instead (e.g. You can also link it with other users on your server, but creating a new one is recommended. Go to the next step, leave everything to the default values and click on Submit. The data will then be displayed in Home Assistant in interactive cards with the graphical format. A hookup guide for the SparkFun IOTA - Satellite Communication Module (ARTIC R2) (SPX-17984), microSD Card with Adapter - 16GB (Class 10), LCD Touchscreen HAT for Raspberry Pi - TFT 3.5in. Click on Provision, enter the Wi-Fi credentials and wait for the provisioning process to complete. If we had removed the state_topic from the light, we would be able to control the light, but we wouldn't be able see from Home Assistant if the light is on or off. This way, I can use normal batteries to power this device and have them last much longer. How else could we take this further? Practically, this means that your MQTT broker will know about any and all devices that have announced themselves, without you having to do anything. Once pressed the button will publish to the topic room/light with message of "on" or "off". In this example we'll create an automation to be triggered from the first MQTT example to toggle the Wifi Plug of the second example to show how to use Home Assistant to take a device that you made and programmed to control a commercially available device, or in our case a WiFi plug switch. Learn how your comment data is processed. For the structure of the network file, follow the HassOS howto. Copy and paste the code below into your Arduino IDE, make sure to select ESP32 Dev Module as your board, and the correct COM port is selected. If the syntax is correct, it will display a message "Configuration Valid". When you use MQTT Discovery, the MQTT device, in this case an Arduino, sends a message to a discovery topic on the MQTT broker telling it exactly which topic it should listen to for messages. Head over to Configuration > Users and click on Add user. After its done, go to the Devices tab and you should see your Devices name. Again, this is my personal use for it and it might differ from you own uses. Also, you need to change the last line to your phones name which we noted in the previous step. ESP32 and Toit: Integrating Home Assistant through MQTT, A micro USB cable for connecting ESP32 to PC. For all your Computers & Electronics needs. An Electrical Engineering student who's also robotics and a tech enthusiast. Well be using it in this tutorial. Click on Provision, enter the Wi-Fi credentials and wait for the provisioning process to complete. I hope this was helpful to you! If there is anything I don't want to several times, I will find a way to automate the process. If you're having a hard time finding the entity ID for a device, you can look it up under the developer tools section of the left menu bar under services. protocol and well be using it to send temperature and humidity values coming from an SHT31-D sensor. Later on we'll be using this add-on to modify the configuration.yaml and automations.yaml files. For more context on how this discovery function fits in the whole program, I'm including my full script below. in Chrome or Edge browser only. Lastly, restart your Home Assistant server. MQTT discovery has made my experience with MQTT devices infinitely better. To get started, we'll first need to install Home Assistant by downloading the image for your device. In the first example we sent messages over MQTT of "on" and "off" over the "room/light" topic. Next, we define a few global parameters for MQTT. The data will then be displayed in Home Assistant in interactive cards with the graphical format. It is recommended to install VS code and Toits language extension as told in the installation link for hassle-free development. This is a completely optional part, so you can skip it if you don't need it. mqtt_server is where your Mosquitto broker have been installed, this would be the ip address of your Raspberry Pi where you have installed Home Assistant. Thank you very much for this great tutorial ! The temperature sensor LM35 have 3 legs, the first leg is VCC, you can connect this to the 3.3V (ESP8266 boards output is 3.3V). Now, click on RE-CONFIGURE MQTT. If you're able to see your components, clicking on the slide switch of the light or the lightning bolt symbol of the switch will turn the ESP32's LED on. Before we can start using MQTT, we need to configure Home Assistant's MQTT broker. After installing, enable the watchdog and start the broker. If you're not able to see your light and switch, they may be in your unused entities. Home Assistant will automatically scan your network to add devices. This way, your MQTT device announces itself to the broker, without you having to manually configure the broker. If you have been following my post on installing Home Assistant on Raspberry Pi, now it is the time to try posting MQTT message to Mosquitto within Home Assistant. The second device we'll add is the light component just below the switch component with an empty line separating the switch component with the light component. iSelector devices work under the Tuya light component, so to add the device we'll the following to our configuration file after our MQTT light: After adding those lines, our configuration.yaml file should look like this: Once again, save the configuration file, check the configuration, and restart the server. The name is only used to remember what the automation does, so we can simply put "MQTT -> WiFi Plug". Finally, make sure the file is saved and restart the Home Assistant server. Now, to test the mobile notification service, go to Developers Tools > Services and start typing notification. If. The line states.sensor.temperature.state | float > 30.00 defines the temperature threshold, which is 30 degrees in this case. All other packages come bundled with the firmware. Before configuring the MQTT broker, we will create a new user specifically for MQTT usage. This works fine, but if you have more than 2 or 3 devices, this can get old really quickly. The very first thing would be to install the SHT31-D sensors driver and MQTT package from pkg.toit.io. Click to share on Twitter (Opens in new window), Click to share on Facebook (Opens in new window), Click to share on LinkedIn (Opens in new window), Click to share on Pinterest (Opens in new window), Click to share on Pocket (Opens in new window), 4 Steps to Configure InfluxDB and Grafana, Securely using SSH public key Authentication to connect to Remote system, How to Download YouTube Video and Convert it to Mp3, Splitting Audio files by detecting silence using FFMPEG, Download all PDF from a Website using WGET, 4 Steps to create WiFi Controlled RGB LED Strip using ESP8266. So as the result we will be able to monitor the temperature. All of your configurations are stored in the appropriately named file called configuration.yaml. To check the configuration, go to the tab labeled Configuration NOT Configurator along the left side, and select General, and click "CHECK CONFIG". We'll setup the Mosquitto broker the same way we did the Configurator. Copy the following lines inside it-. I'm using a pipe to specify a default value (0 in this case) in case there is no moisture sensor or there is something wrong. To fix that, we'll need to get Home Assistant to subscribe to those same topics, which is done by adding the components to the configuration file. This configuration page is where we'll initialize our MQTT broker and devices. Copy and paste the code below into your Arduino IDE, make sure to select ESP32 Dev Module as your board, and the correct COM port is selected. Even though the server is running in the background, Home Assistant doesn't know what topics the Thing Plus boards are subscribing and publishing to. They do require that you download the app to connect the plugs to your wireless network. In this tutorial, well have a look at how we can create an.
Once the code has uploaded, and the server has restarted, go to your overview or unused entities, and make sure your automation is enabled. I will be posting more about some of the topics I've skipped in this post, like Wi-Fi connections for the NodeMCU. All programs used in this tutorial can be found inthis Github repository. First click on the Mosquitto broker under the offical add-ons section of the add-on store. on the other hand provides an excellent platform for building and deploying IoT applications with very little effort. The first thing we need to do is to give the automation a name. It makes using new devices as simple as powering it on and leaving it alone. So why use Home Assistant? This is a discovery message for the temperature sensor of this certain device: As you can see, this script specifies a value_template for this specific sensor.
Now that we have Home Assistant set up, we need to configure it. You may receive a few notifications to set up the devices found, typically these are home media devices, such as Google cast, Plex, etc. To check whether there is any error, you will have to look at the Home Assistant log file, this is located at Configuration->General->Log and make sure there is no error related to the configuration. You'll also see that from Home Assistant, the light bulb symbol of the light also turned on. For more information about about Home Assistant, check out some of the links below: Need some inspiration for your next project? Pressing the button a second time should turn off the LED. The float readings are limited to two decimal points and the data is published in the JSON format. The state_topic parameter defines the MQTT topic which will be subscribed for getting the data. If your Mosquitto broker add-on is enabled and running, you should see a MQTT component in the discovery section; click Configure. Before we restart the Home Assistant so that our configuration takes affect, it is a good idea to check that there is no error in the config, to do this login to Home Assistant and click on Developer Tools->Services. In this code sample I will skip over a few things. Regardless of what you ultimately use Home Assistant for, one add-on that will make configuring Home Assistant easy without having to SSH into your Pi is the Configurator under Official add-ons. If you're unsure of what MQTT is and how it works, there's a guide for that! That process works really well, but it requires manual work. Adding devices that are commercially available is even easier. "value_json" parses the incoming JSON string as a JSON object, so we can use the dot notation to get nested values. You may not need everything though depending on what you have. First click on "Configurator" from the left menu bar. Execute the following commands in the working directorys terminal: The SHT31-D and MQTT packages (or libraries) are now installed locally in the Toits working directory. With this, Toit is all set and we can begin with programming. If both of those are right, the MQTT broker might not have been set up correctly. This is a completely optional part, so you can skip it if you don't need it. An introduction to MQTT, one of the main communication protocols used with the Internet of Things (IoT). You can change it to your liking. By sending this JSON object to the MQTT discovery topic, Home Assistant knows what to do with the messages it receives. Automations consist of three parts: The trigger which starts the processing of an automation rule, the optional conditions which can be used to prevent an action from happening when triggered (e.g. I will, however, include them in the code sample for the full picture. This site uses Akismet to reduce spam. When done press save, and restart the server. The main reason is the time it takes to connect to the WiFi network and then to the MQTT server. we'll need those credentials later when we set up our ESP devices. We'll need to use this add-on later after we get more of our hardware setup. Finally, save the configuration file and restart your Home Assistant server. If not it will show you a debug message showing where the error occurred that needs to be fixed. To test whether everything is working properly, run the program by clicking on the run button associated with your device in VS codes Toit extension. So what does it actually look like to code MQTT Discovery on your Arduino or NodeMCU? It's great to combine this with something like Grafana and InfluxDB, because you'll see the sensor values show up right after you plug in your device. This confirms that our MQTT broker is all set.
I described how to create a simple MQTT switch in Home Assistant. Toit recently released the. After downloading the app, the entities of your phone such as battery state, charging state etc. After the add-on has been installed, you'll want to click start and enable the "Show in Sidebar" option, and that will add a new option to your left menu bar with the name "Configurator" after you reload the page. If you're familiar with If This Then That (IFTTT) automations, they work very similarly. should be visible in the Home Assistants UI. To open the configurations file, first click on the folder icon to browse the file system. In this tutorial we'll cover how to set up Home Assistant, and regardless of whether you created the devices yourself or purchased off the shelf IoT devices, get them working together in harmony. From this page you'll see all of your unused entities, including the Example_Light and Example Switch: If you still can see all of your components, the issue may be your MQTT broker. To get up and running fast and reliably we'll be using a hardwired connection to our router. Toit on the other hand provides an excellent platform for building and deploying IoT applications with very little effort. This guide hasn't even scratched the surface of what Home Assistant is capable of. The client will connect and we print the same for debugging purposes. Fill in the information for your WiFi credentials (your WiFi network must be on the same network as the Raspberry Pi), your user name and password you created for Home Assistant, and the IP address of the Pi. Pretty cool! And your devices should now be visible either from the overview or unused entities pages. I will be sharing my Arduino program in case you're looking to use this for your own projects as well. We won't need to add any conditions to the automation, so for the actions we'll set the action type to "Call service". To do this we'll need to flash the ESP32 Thing Plus boards with some code using Arduino. Head over to Supervisor > Add-on store and search for Mosquitto MQTT. For this first example we'll connect two ESP32 Thing Plus boards to our network over MQTT. Home Assistant is one of the largest open-source platforms for home automation and is very popular for managing things through IoT. The first device we'll add is the switch component, just like when we added the MQTT component, it doesn't matter where we add the switch to the configuration file, but to keep things organized, we'll add the following lines below the mqtt initialization. If you're searching for your own smart devices and aren't sure if they'll work with Home Assistant, a Google search with the device + Home Assistant should at the very least give you some Home Assistant forum questions with answers to help you decide. Each of these sensors have their own "state", which means they all need their own discovery topic as well. only during a certain time, or only if a switch is currently on or off), and actions which Home Assistant will do when the automation is triggered. I don't have to worry about manually registering devices in Home Assistant any more, because the devices register themselves now. With the iSelector plugs, they use an app called Smart Life, which requires you to sign up for a free account. To follow along with the examples in this tutorial, you will need the following pieces of hardware. For the trigger, we'll select MQTT as the trigger type, with the topic set to "room/plug", and for the payload enter "toggle". Mosquitto is an open source MQTT broker server that receives and distribute messages over the MQTT server. Once the configuration is valid, press "RESTART" under Server Management, and wait a minute for the changes to be applied. Home Assistant companion application installed in your. We are going to use the temperature sensor LM35 connected to the A0 of ESP8266 like in the following picture. ssh to your Rapsberry Pi. Once those lines have been added, your configuration file should look like this: Once the light and switch components have been added, we'll need to save the configuration file again, check that the configuration valid, and restart the server. First we told the Home Assistant that we would like to add a switch component. Create a new.toit file in the project folder and name it sht31-mqtt.toit. The output should show that the app was successfully deployed. In this post, I'll go over a few things that I've done to use this feature to automate my MQTT devices. The final step is to create cards for displaying sensor data. Next we need to make sure your Pi will have an Internet connection. But if you'd prefer WiFi, you can either use a blank USB stick with a Fat32 partition (with the partition labeled "CONFIG"), and while in the root (/) directory, create a network/my-network file. You can change it to your liking. This a great place to take those skills to the next level. Now, in the Entity drop-down menu, select Temperature (sensor.temperature) and click on save. Once the code has uploaded, open the terminal window to make sure that the light successfully connected to WiFi, and has connected to the MQTT network. An SHT31-D temperature and humidity sensor will send data to Home Assistant through MQTT. But with having a WiFi remote for your switches, it's likely that battery power would be preferable to allow moving the switch anywhere you'd like. In this case, it is mobile_app_redmi_5. Toit recently released the support for MQTT protocol and well be using it to send temperature and humidity values coming from an SHT31-D sensor. The payload we're listening for is "on" to turn the light on, and "off" to turn the light off. Once the code has uploaded, open the terminal window to make sure that the switch successfully connected to WiFi, and has connected to the MQTT network. Repeat the same for Humidity and close the dashboard editing. With the sketch below, the ESP32 Thing Plus will draw around 5mA while in sleep mode, and draw up to 160mA when the MQTT packet is sent. After clicking on it, a list of fields will appear. MQTT Discovery is essentially a way to tell your MQTT broker, Mosquitto running inside of Home Assistant in this case, which topics it needs to listen to. If all goes well, one minute later the ESP8266 should have published the temperature reading and you are able to see this like the following picture: Now that we know our MQTT broker is working ok. At this point the temperature reading will not be reflected into the main home screen. The light will listen for commands from the topic "room/light", which is the same topic we defined in the ESP32's Light Arduino sketch. The parameter repeat: 1 defines the time interval in minutes after which the notification will appear again. The very first thing would be to install the SHT31-D sensors driver and MQTT package from. This user will be used to authenticate the broker. Make sure the status is. Go to the Overview tab, on the top right corner click on Edit dashboard > Add new card and select the one you like, I will be selecting the Sensor card. You can find the IP address by logging into your router (typically by typing 192.168.1.1 into the address bar of your browser), finding your Pi (should be named hassio). Leave the broker and port to the default values and change the username and password to the one created in the previous step. Finally, click on the Deploy button associated with your device. Operating on a , This is a class 10 16GB microSD memory card, perfect for housing operating systems for single board computers and a multitude, This LCD Touchscreen HAT fits on top of the Raspberry Pi, practically form fitting on top of it so as not to compromise the o. Add it to your cart, read through the guide, and adjust the cart as necessary. The last section explains how you can configure Home Assistant to send alerts using its companion app. Once both devices have connected, you can press the button connected to IO pin 0 of the ESP32 Thing Plus acting as a switch and the LED on IO pin 13 of the light should turn on. The very first step is to install the Mosquitto MQTT broker. We'll also send alerts to a mobile phone through t. In this tutorial, well have a look at how we can create an MQTT sensor for Home Assistant with ESP32 and the Toit platform. If youre new to Toit, you can quickly set up your ESP32 device using the Web serial interface. The light uses the MQTT platform, and has a name called "Example_Light". publish client/mqtt.Client temp/float hum/float: print "Published message `$temp` on '$TOPIC'", // Publish readings at interval of 10 seconds, publish client driver.read_temperature driver.read_humidity, Sending high-temperature alerts to mobile phone, The last section explains how you can configure Home Assistant to. If you're able to connect to the network and not the Pi, make sure the IP address is correct, as well as the credentials for Home Assistant. When the message "on" is received, it will turn on the LED connected to IO pin 13, and when "off" is received, turn the LED off. Finally, well also send a high-temperature notification alert through the Home Assistants mobile phone app. With everything working as expected, we can now deploy the application. Make sure the status is Healthy which indicates that your device is connected and ready to use. mqtt_username and mqtt_password is the one you have setup during the installation of Mosquitto in the previous post step no 6. Home Assistant's installation page does a great job outlining how to flash the image to your SD card, but after you download your image you'll need to install Hass.io by connecting your SD card to your computer and flash the image using a program called balenaEtcher. Home Assistant doesn't know what to do with that, so we need to tell it how to get the value of the temperature sensor from this JSON object. Type in the credentials and click on create. Make sure to keep track of the login used. Execute the following commands in the working directorys terminal: toit pkg install github.com/harshkc03/sht31-d_driver.
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