DWD pollen sensor for Home Assistant

Home Assistant component to retrieve Pollen data from the DWD (Deutscher Wetterdienst, Germany)

Installation

Either checkout this repository using git clone git@github.com:marcschumacher/dwd_pollen.git or download a specifc version from the release page.
Copy the created folder dwd_pollen to your configuration folder under <config>/custom_components/.
Install the required dependencies using pip3. cd to the dwd_pollen folder and execute the following command:
```
pip3 install -r requirements.txt
```
Now you are done. Proceed with configuring the component.

Configuration

To be able to use this component, add the following configuration to your configuration.yaml:

sensor:
  - platform: dwd_pollen
    partregion_ids:
      - 41
      - 42
    include_pollen:
      - birke
      - erle
    include_days:
      - today

Here is a description of the values possible:

Parameter	Default values	Possible values	Description
partregion_ids	no default	API description (search for partregion_id in the PDF)	Region for which the date shall be retrieved.
include_pollen	all possible	`birke`, `graeser`, `esche`, `erle`, `hasel`, `beifuss`, `ambrosia`, `roggen`	List of pollens to retrieve and provide information about.
include_days	all possible	`today`, `tomorrow`, `dayafter_tomorrow`	Days to include

Sensors

Per default every 15 minutes new values are retrieved from the DWD.

Two groups of sensors are created: value sensor that contain the actual values and statistical sensors which return the average, maximum and minimum values calculated over all specified pollen types.

Value sensors

The value sensors have the following format: sensor.dwd_pollen_<partregion_id>_<day>_<pollen type>, e.g. sensor.dwd_pollen_41_today_ambrosia.

The value of this sensor is an integer between 0-6. Basically the values are normalized from the input values delivered by DWD to make it easier to calculate with it. The following table describes which values are what:

DWD	Sensor	Meaning (in German)
0	0	keine Belastung
0-1	1	keine bis geringe Belastung
1	2	geringe Belastung
1-2	3	geringe bis mittlere Belastung
2	4	mittlere Belastung
2-3	5	mittlere bis hohe Belastung
3	6	hohe Belastung

The following attributes are provided (default attributes excluded):

Attribute	Example	Description
attribution	Data provided by DWD	Data provider (currently fixed value)
last_updated	2019-05-16T11:00:00	Time when the provided information was updated by the DWD
region_name	Nordrhein-Westfalen	Region name
partregion_name	Rhein.-Westfäl. Tiefland	Subregion name
original_value	0-1	Original value retrieved from DWD (see table above)
description	keine bis geringe Belastung	Human readable text (in German) describing the severity of the pollution

Statistical sensors

Statistical sensors have the following format: sensor.dwd_pollen_<partregion id>_<day>_<stat type>, e.g. sensor.dwd_pollen_41_today_avg.

Statistics are always calculated using the values for a specific day for the specified pollen types. Following types are supported:

Type	Description
min	Minimum
max	Maximum
avg	Average

Be aware that the average value might not be an integer, but a floating value.