I thought I'd have a go at creating a new service now. I've got most of the code in place and I've got the service to run, but I'm struggling a bit with the formula.
The actual formula's very long so I've made up a short, fake one for the purposes of this post which is 'outTemp * outHumidity + 5'. The code for the service is therefore as follows: *import weewxfrom weewx.engine import StdServiceclass MyHeatIndex(StdService): def __init__(self, engine, config_dict): # Pass the initialization information on to my superclass: super(MyHeatIndex, self).__init__(engine, config_dict) self.bind(weewx.NEW_ARCHIVE_RECORD, self.new_archive_record) def new_archive_record(self, record): record['heatindex'] = my_fancy_formula( 'outTemp * outHumidity + 5')* When I tried running that (with the actual formula in place), it says that my_fancy_formula isn't defined. I've read up about this but I'm unsure how to fix this - any help would be appreciated. Thanks On Thursday, 15 June 2017 19:44:40 UTC+1, Tom Keffer wrote: > > The "weewx way" would be to write a simple service that binds to the > NEW_ARCHIVE_RECORD events and replaces the value of heatindex with the > results of your calculation. Something like (NOT TESTED): > > from weewx.engine import StdService > class MyHeatIndex(StdService): > > def __init__(self, engine, config_dict): > # Pass the initialization information on to my superclass: > super(MyHeatIndex, self).__init__(engine, config_dict) > self.bind(weewx.NEW_ARCHIVE_RECORD, self.new_archive_record) > > def new_archive_record(self, record): > record['heatindex'] = my_fancy_formula(record['windGust'], > record['outTemp'], ........) > > Run the service *after* StdWXCalculate. > > See the section *Creating a new service > <http://weewx.com/docs/customizing.htm#Adding_a_service>* for details. > > -tk > > > On Thu, Jun 15, 2017 at 9:52 AM, David Watts <[email protected] > <javascript:>> wrote: > >> Hi >> >> I want to tinker with the 'heat index' formula in wxformulas.py and >> introduce wind gusts and speed into it. >> >> I notice the wind speed is available (V_mph, used for wind chill) but how >> would I introduce the wind gust? >> >> Thanks >> >> -- >> 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] <javascript:>. >> For more options, visit https://groups.google.com/d/optout. >> > > -- 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]. For more options, visit https://groups.google.com/d/optout.
