Sprinkler

Requirements

1. The System shall sprinkle if the lawn needs water
2. The System shall sprinkle in the morning no earlier then 6:30 pm
3. The System shall collect rain data from a weather service e.g. Deutscher Wetter Dienst open data server opendata.dwd.de

System context

Weather API alternatives

• http://www.programmieren-optimieren.de/php/google-wetter-api-eingestellt-die-alternativen/
• https://stackoverflow.com/questions/12461730/find-weather-using-java

Open Weather Api

City list: http://bulk.openweathermap.org/sample/city.list.json.gz

Example city Willich

{
    "id": 2808559,
    "name": "Willich",
    "country": "DE",
    "coord": {
      "lon": 6.55,
      "lat": 51.26667
    }
  },

Example weather

https://api.openweathermap.org/data/2.5/weather?q=Willich,DE&appid=0123456789abcdef...&units=metric

{
 "coord":{"lon":6.54,"lat":51.26},
 "weather":[{"id":800,"main":"Clear","description":"clear sky","icon":"01d"}],"base":"stations",
 "main":{"temp":28.84,"pressure":1020,"humidity":37,"temp_min":27,"temp_max":30},"visibility":10000,
 "wind":{"speed":1.5},
 "clouds":{"all":0},"dt":1533138900,
 "sys":{"type":1,"id":4909,"message":0.0046,"country":"DE","sunrise":1533095958,"sunset":1533151198},
 "id":2808559,
 "name":"Willich",
 "cod":200
}

Java Code

• https://stackoverflow.com/questions/50388823/java-get-specific-json-information-from-weather-api/50389193#50389193

DWD Data

Precipitation data:

• https://www.dwd.de/DE/leistungen/radolan/radolan.html
• Adjusted 1h total precipitation [mm/h] (Radolan), 1km x 1km, Runlength format raa01-rw_10000-[yyMMddhhmm]-dwd---bin
• https://www.dwd.de/EN/ourservices/surface_weather_observations/surface_weather_observations.html

How to read Radolan data

1. https://www.hs-rm.de/de/fachbereiche/architektur-und-bauingenieurwesen/forschungsprofil/arbeitsgruppe-starkregen-und-sturzfluten/projekt-klimprax-ap1/radar-software/

Wetter Online

• https://wo.wetteronline.de/media/api/Schnittstellendokumentation_Wetter-API_v1_ges.pdf

METAR

https://en.wikipedia.org/wiki/METAR Example: Mönchengladbach

• http://tgftp.nws.noaa.gov/data/observations/metar/decoded/EDLN.TXT