Merge pull request #3 from peterzen/round-calculated-values

Round calculated values

README.md

@@ -3,6 +3,8 @@
 
 This Home Assistant add-on retrieves live weather data from a WH2600 personal weather station (PWS) and publishes it to an MQTT topic where HAAS can access it as sensor information.
 
+Supported weather stations: tested on Renkforce WH260, probably also supports Froggit units but I can't verify it.
+
 ## Installation
 
 Add this URL to your HAAS add-on repositories:

pwsmqttdispatcher/CHANGELOG.md

@@ -1,3 +1,9 @@
+## 0.1.19
+
+- Rounding calculated values to 1 decimal
+- Added info about supported weather stations
+
+
 ## 0.1.18
 
 - Calculate dew point, wind chill, cardinal wind direction

pwsmqttdispatcher/config.yaml

@@ -1,6 +1,6 @@
 # https://developers.home-assistant.io/docs/add-ons/configuration#add-on-config
 name: PWS to MQTT dispatcher addon
-version: "0.1.18"
+version: "0.1.19"
 slug: pwsmqttdispatcher
 description: Push weather station (PWS) data to MQTT
 url: "https://github.com/peterzen/haas-pws-mqtt-addon/tree/main/pwsmqttdispatcher"

pwsmqttdispatcher/src/main.go

@@ -205,15 +205,15 @@ func calculateWindChill(windSpeed float64, temp float64) float64 {
 	T := temp*1.8 + 32        // convert temperature to Fahrenheit
 	WCI := 35.74 + 0.6215*T - 35.75*math.Pow(V, 0.16) + 0.4275*T*math.Pow(V, 0.16)
 	windChill := (WCI - 32) * 5 / 9 // convert wind chill to Celsius
-	return windChill
+	return math.Round(windChill*10) / 10
 }
 
 func calculateDewPoint(tempCelsius, humidity float64) float64 {
 	a := 17.27
 	b := 237.7
 	alpha := ((a * tempCelsius) / (b + tempCelsius)) + math.Log(humidity/100.0)
 	dewPointCelsius := (b * alpha) / (a - alpha)
-	return dewPointCelsius
+	return math.Round(dewPointCelsius*10) / 10
 }
 
 func addCalculatedData(wd WeatherData) WeatherData {