HSRW Weather Station at Campus Kamp-Lintfort

Fig.: HSRW Weather Station, Campus Kamp-Lintfort

Interactive Grafana Dashboard of Real-Time Weather Data

Fig.: Interactive real-time data plots. Click on the image or here to open the Grafana dashboard.

The Sensors of the Weather Station

Measurement	Sensor	Datasheet
Temperature	PT100 platinum wire, TF type 2018	TF type 2018
Temperature / Humidity	PT100 & capacitive element, TF type 3033	TF type 3033
Wind Speed	Cup anemometer, TF type 4035	TF type 4035
Wind Direction	Wind direction sensor, TF type 4123	TF type 4123
Barometer	Piezoresistive element, TF type 5004	TF type 5004
Precipitation	Tipping bucket rain gauge, TF type 7041	TF type 7041
Soil Moisture	Time Domain Reflectometer, IMKO TRIME-PICO64	TRIME-PICO64
Photosynthetically Active Radiation	Kipp & Zonen PQS 1 PAR Quantum Sensor	PQS 1 PAR
Solar Radiation	Pyranometer, Kipp & Zonen SMP10	SMP10

Accessing the Real-Time Online Data

The data of our weather station is freely available!
We provide two main channels to access the data:

MQTT (trough our own broker),
RESTful API

The accessible variables:

Key	Unit	Comment
wind_speed	km/h
wind_direction	degrees
air_temperture	°C
air_relhumidity	%
smp10	W/m2
pqsl	µmol/m2s
soil_moisture	%	Sensor not relevant
soil_tempblue	°C	Sensor not relevant
soil_tempred	°C	Sensor not relevant
air_pressure	hPa
precipitation	mm
created_at	ISO8601	UTC

MQTT Broker and Topic for Subscribing to Real-Time Online Data

We also publish our data on our own MQTT Server which doesn't need any authentication for receiving that kind of data.

MQTT Broker and Topic
URL	eolab.de
PORT	1883
TOPIC	weather/hsrw-kali

RESTful API to Request Real-Time Online Data

The RESTful Application Programming Interface (API) is used to download data or retrieve data e.g. in own programs or scripts.
The data is provided in a JSON-format.

Examples (response takes some time)

Get the recent 20 measurements:
https://weather.eolab.de/api/weather

Retrieve the last 20 sensor data from all sensors since 12th Nov. 2021, 14:55:32, Central European Time (CET, Germany):
https://weather.eolab.de/api/weather/2021-11-12T14:55:32.000+0100

Retrieve every fifth measurement from all sensors between two timestamps (date + time):
https://weather.eolab.de/api/weather/2021-11-12T14:55:32.000+0100/2021-11-12T14:59:32.000+0100/5

Second timestamp in milliseconds since 1970-01-01 00:00:00 UTC (Universal Time Coordinates ~ Greenwich Mean Time)
https://weather.eolab.de/api/weather/2021-11-12T14:55:32.000+0100/1636734789719/5

API Documentation

The API is now available under https://weather.eolab.de/api.

Two different timestamp (date + time) types are supported:

time in ms since 1970-01-01 00:00:00 UTC
ISO8601

The ISO8601 date-time standards can have different formats. A common one is: YYYY-MM-DD'T'hh:mm:ss.sss'Z'
Z is the offset from the UTC timezone, e.g. 2020-12-31T21:45:10.500+0100 is Dec. 31, 2020, 21:45 plus 10.5 seconds in UTC +1h, i.e. Central European Time CET (not summer time CEST!).
The same timestamp in UTC: 2020-12-31T20:45:10.500+0000 (or 2020-12-31T20:45:10.500Z or 2020-12-31T20:45:10.500UTC. Time zone abbreviations such as CET, CEST, UTC, GMT are not supported in the API, yet).

The routes of the API:

/
Check if the server is online and has a database connection
/weather
Get the last 20 measurements
/weather/:begin
Get the 20 next measurements after begin
:begin has to be replaced by the time in ms since 1970-01-01 00:00:00 UTC
/weather/:begin/:end
Get all measurements between begin and end
:begin and :end in ms since 1970-01-01 00:00:00 UTC
- do not misuse this route
/weather/:begin/:end/:n
- Get every nth measurement between begin and end
- :begin and :end have to be replaced by the time in ms since 01.01.1970 00:00:00 UTC
- :n has to be replaced with a number (ex.: get every 3rd measurement)

Example to retrieve every 5th data set between 627650252438 ms and 1627650855553 ms since 1970-01-01, i.e. from the Fri Jul 30 2021 15:04:12 GMT+0200 to Fri Jul 30 2021 15:14:15 GMT+0200: https://weather.eolab.de/api/weather/1627650252438/1627650855553/5