Aulos / local_luftdaten

Custom component for Home Assistant that integrates your (own) local Luftdaten sensor (air quality/particle sensor) without using the cloud.

Custom Luftdaten component for Home Assistant

About

This custom component for Home Assistant integrates your (own) local Luftdaten sensor (air quality/particle sensor) without using the cloud. If you want to know more about the sensor and how to build one check this website: https://luftdaten.info/en/home-en/

Installation

HACS

If you use HACS you can install and update this component easily via the default repository. Go into HACS -> Integrations and search for luftdaten.

Manual

Download and unzip or clone this repository and copy custom_components/local_luftdaten/ to your configuration directory of Home Assistant, e.g. ~/.homeassistant/custom_components/.

In the end your file structure should look like that:

~/.homeassistant/custom_components/local_luftdaten/__init__.py
~/.homeassistant/custom_components/local_luftdaten/manifest.json
~/.homeassistant/custom_components/local_luftdaten/sensor.py

Configuration

Create a new sensor entry in your configuration.yaml and adjust the host name or the ip address.

sensor:
  - platform: local_luftdaten
    host: 192.168.0.123
    name: Feinstaubsensor
    monitored_conditions:
      - SDS_P1
      - SDS_P2
      - temperature
      - humidity

At the moment following sensor data can be read:

• SDS_P1
• SDS_P2
• temperature
• humidity
• signal
• BME280_temperature
• BME280_humidity
• BME280_pressure
• BMP_pressure
• BMP_temperature
• BMP280_pressure
• BMP280_temperature
• HTU21D_temperature
• HTU21D_humidity
• SPS30_P0
• SPS30_P2
• SPS30_P4
• SPS30_P1
• PMS_P0
• PMS_P1
• PMS_P2

Sensor type signal gives the wifi signal strength of the sensor device.

Please open an issue if you want to see other attributes and provide me with a sample of your sensor data by calling http://192.168.x.y/data.json.

Examples

Rounding and offset

Use Template Sensors to round the values or to give them a offset.

sensor:
  - platform: template
    sensors:
      temperature:
        value_template: '{{ (states("sensor.feinstaubsensor_temperature") | float) | round(1) - 2}}'
        friendly_name: 'Temperature'
        unit_of_measurement: '°C'

Calculate equivalent atmospheric pressure at sea level

To adjusted the atmospheric pressure to the equivalent sea level pressure you need to use the barometric formula which depends on the altitude and the current temperature. In this example we use an altitude of 300m and receive the temperature from our sensor sensor.feinstaubsensor_temperature.

atmospheric_pressure:
      value_template: >-
        {% set temperature_gradient = 0.0065 %}
        {% set exponent = 0.03416 / temperature_gradient %}

        {% set altitude_meters = 300 %}
        {% set temperature_celsius = states('sensor.feinstaubsensor_temperature') | float %}
        {% set temperautre_at_sealevel_kelvin = temperature_celsius + (temperature_celsius * temperature_gradient) + 273.15 %}
        {% set air_pressure_hpa = (states('sensor.feinstaubsensor_pressure') | float / 100) | round(1) %}

        {{ (air_pressure_hpa / (1 - ((temperature_gradient * altitude_meters) / temperautre_at_sealevel_kelvin)) ** exponent) | round(1) }}
      friendly_name: 'Atmospheric pressure'
      unit_of_measurement: 'hPa'