Conversion unit in second data source

[flor...@pre-vost.fr]

Hi, 

I work to implement a second data source with Netatmo Station and let the driver to the Davis Vantage Pro 2.

But the new StdService can't convert US unit to my database unit (Database is set to Metric). 

I've set this on the top of my py file but the conversion doesn't work : 

import weewx.units
from weewx.engine import StdService

weewx.units.obs_group_dict['windSpeedNetatmo'] = 'group_speed'
weewx.units.obs_group_dict['windGustNetatmo'] = 'group_speed'
weewx.units.obs_group_dict['rainNetatmo'] = 'group_rain'
weewx.units.obs_group_dict['windGustDirNetatmo'] = 'group_direction'
weewx.units.obs_group_dict['windDirNetatmo'] = 'group_direction'
weewx.units.obs_group_dict['barometerNetatmo'] = 'group_pressure'
weewx.units.obs_group_dict['outTempNetatmo'] = 'group_temperature'
weewx.units.obs_group_dict['datetimeNetatmo'] = 'group_time'

The StdService can convert unit or not ?

Thank's a lot. 

[Tom Keffer]

I'm not sure what you mean by StdService. That's the abstract base class all the services inherit from.

In any case, if a service is to augment a record, it must check what unit system the incoming record is in, then convert what it is about to add to that unit system. There are many utilities in weewx.units for doing this. In particular, look at weewx.units.convertStd().  Also, look at ValueTuples, also to be found in weewx.units.

Say you are about to add a wind speed that is m/s. It would look something like this (NOT TESTED):

def new_archive_record(self, event):

    my_wind_speed =  (obtained from somewhere)

    # Create a Value Tuple:

    wind_speed_vt = weewx.units.ValueTuple(my_wind_speed, 'meter_per_second', 'group_speed')

    # Convert to the same unit system as the record

    wind_speed_converted_vt = weewx.units.convertStd(wind_speed_vt, event.record['usUnits'})

    # Put the converted value into the record:

    event.record['windSpeedNetatmo'] = wind_speed_converted_vt.value

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[flor...@pre-vost.fr]

Hi,

It work like a charm !

Just a last question. It is possible to capturing if the principal driver is in on new_archive_records ?

For example, if my driver get archive data or when I start a wee_reports, the driver checl also.

But for limited reach of Netatmo API set to 1000/j.