Matthew Wall's Weewx-netatmo driver (thank you Matthew for creating it!) collects the data from the Netatmo server by using the /getstationsdata method provided by the Netatmo API. The behaviour of this method for the data provided by the rain gauge is weird. Indeed, as a few others noticed, summing up over one day the rain data reported by the /getstationsdata for each observation period you do not have the same amount of rain given directly by the station for the day (that, by the way is wrong as well but to a minor extent). Usually you have a much lower value . The reason for this is that the station sends the rain data to the server every 10 minutes. Each data packet reports the rain fallen during 2 five minute observation periods but the /getstationdata method sends back the rain for just one of these periods the other is simply dropped. You can see evidence of this in the attached picture where I compare the data of my station downloaded from the netatmo.com website as an xls file (that are correct) with those reported by the /getstationsdata (on the right) where each second "five minutes"data are missed. The error is greater during heavy rain. Indeed, there is no error in some cases, e.g. when during the missed observation period we have no rain at all.
In conclusion, using Weewx with our Netatmo weather station results in wrong data for rain measurement and the error can be very high (50% and more), . I think that the problem could be fixed by using the /getmeasure method in place of the getStationdata one, because with this method you can access the data relevant to whatever 5 minutes time inetrval you specify in the query. Unfortunately, my software developping skills are not strong enough for forking Matthew Wall's driver. Matthew, are you around? Regards Emilio -- You received this message because you are subscribed to the Google Groups "weewx-user" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/weewx-user/5692a77e-1ad7-44e7-8317-8f31f9fe7766n%40googlegroups.com.
