changing to metric system when using driver as a standalone program

[Saverio Guzzo]

Hello community!

I'm using the vantage's driver as a standalone program and I'm wondering if there is an way to convert the measurements to the metric system.

I tried to edit the entry "unit_system" of the  file "weewx-x.y.z/weewx.conf" to 'metric', but when running the following piece of code

for packet in vantage.genDavisArchiveRecords(since_ts):

print(packet)

I still get all the measurements in US system.

What I am missing?

Thank you very much for your help, I appreciate it :)

Saverio

[Tom Keffer]

The Vantage series reports measurements in the US Customary unit system. Because you are printing packets directly from the driver, that's what you're going to get.

One thing you can do is take advantage of one of the functions in units.py. Try this:

import weewx.units

for packet in vantage.genDavisArchiveRecords(since_ts):

    new_packet = weewx.units.to_METRICWX(packet)
    print(new_packet)

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[Saverio Guzzo]

Wow, thanks Tom!
Such an excellent program!

SG

[Saverio Guzzo]

Hi Tom,

Using the function weewx.units.to_METRICWX is working well for all the fields but highOutTemp, which keeps still being reported in Fahrenheit. Would you have any ideas on the reason for this?

Thanks again!

Saverio

[Tom Keffer]

It looks like it (and lowOutTemp) were never assigned to a unit group. 

Fixed in commit a55892e.

You can either patch your copy of weewx/units.py, or download a fresh one.

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[Saverio Guzzo]

This is solving the issue!

Thanks a lot, Tom!