Homeassistant is a popular open-source home automation platform that allows you to control and monitor various devices in your home. One of the powerful features of Homeassistant is the ability to create sensors that can display real-time data from different sources. In this article, we will learn how to convert an Influx query into a Homeassistant sensor value.
What is Influx?
Influx is a time-series database that is commonly used for storing and analyzing large amounts of time-stamped data. It is often used in combination with Homeassistant to store and retrieve sensor data. Influx provides a query language called InfluxQL, which allows you to retrieve data from the database based on specific conditions.
Understanding the Influx Query
Before we can convert the Influx query into a Homeassistant sensor value, we need to understand the structure of the query. Let's take a look at an example query:
SELECT mean("temperature") FROM "sensor_data" WHERE time > now() - 1h
This query retrieves the average temperature from the "sensor_data" measurement for the past hour. The result of this query will be a single value representing the average temperature.
Creating a Homeassistant Sensor
Now that we understand the Influx query, let's create a Homeassistant sensor that will display the result of the query. To do this, we need to modify the configuration file of Homeassistant. The configuration file is usually located in the "/config" directory and is named "configuration.yaml".
Open the "configuration.yaml" file and add the following code:
sensor:
- platform: command_line
name: "Average Temperature"
command: 'influx -database "your_database" -execute "SELECT mean(\"temperature\") FROM \"sensor_data\" WHERE time > now() - 1h"'
unit_of_measurement: "°C"
value_template: '{{ value | float }}'
Let's break down the code:
- platform: command_line: This line specifies that we are creating a sensor that will execute a command-line command.name: "Average Temperature": This line sets the name of the sensor to "Average Temperature". You can change this to any name you prefer.command: 'influx -database "your_database" -execute "SELECT mean(\"temperature\") FROM \"sensor_data\" WHERE time > now() - 1h"': This line specifies the command that will be executed. Replace "your_database" with the name of your Influx database.unit_of_measurement: "°C": This line sets the unit of measurement for the sensor to degrees Celsius. You can change this to any unit you prefer.value_template: '{{ value | float }}': This line specifies how the result of the command should be formatted. In this case, we are converting the result to a float value.
Save the "configuration.yaml" file and restart Homeassistant for the changes to take effect. Once Homeassistant has restarted, you should see a new sensor named "Average Temperature" in the list of available sensors.
Using the Sensor
Now that we have created the sensor, we can use it in Homeassistant to display the average temperature. You can add the sensor to your Homeassistant dashboard or use it in automations and scripts.
To add the sensor to your dashboard, open the "ui-lovelace.yaml" file located in the "/config" directory. Add the following code:
views:
- title: My Dashboard
cards:
- type: entities
entities:
- sensor.average_temperature
Save the "ui-lovelace.yaml" file and refresh your Homeassistant dashboard. You should now see the "Average Temperature" sensor displayed on your dashboard.
By converting an Influx query into a Homeassistant sensor value, you can easily display real-time data from your Influx database in your Homeassistant dashboard. This allows you to monitor and analyze sensor data from various devices in your home. With the power of Homeassistant and Influx, you can create a truly smart and automated home environment.
References
| Source | Link |
|---|---|
| Homeassistant | https://www.home-assistant.io/ |
| Influx | https://www.influxdata.com/ |