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/const.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.

Parameter	Type	Necessity	Description
host	string	required	IP address of the sensor
scan_interval	number	default: 180	Frequency (in seconds) between updates
name	string	required	Name of the sensor
monitored_conditions	list	required	List of the monitored sensors

sensor:
  - platform: local_luftdaten
    host: 192.168.0.123
    scan_interval: 180
    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
• HECA_temperature
• HECA_humidity
• HPM_P1
• HPM_P2
• SHT3X_temperature
• SHT3X_humidity

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 an 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'