This question was raised as an issue
<https://github.com/gjr80/weewx-gw1000/issues/58> on the Ecowitt gateway
device driver GitHub site. The short answer is that the Ecowitt gateway
devices provide two pressure values; one is absolute pressure and the
other, known as relative pressure, is a simple fixed offset from absolute
pressure. Ecowitt devices use the relative pressure value when publishing
to WU (WU expects barometer). On the other hand the WeeWX calculated
barometer value is altitude and temperature corrected pressure.
There are two approaches to dealing with this issue:
- if you want to have WeeWX, Ecowitt and WU all use the same pressure
values you should add a field map extension to map the driver relabarometer
field to the WeeWX barometer field, eg in weewx.conf:
[GW1000]
....
[[field_map_extensions]]
barometer = relbarometer
- if you want to use a properly corrected barometer value then you need do
nothing to the driver/WeeWX. If you wish WU to use the WeeWX calculated
barometer value you should disable uploading to WU by the Ecowitt gateway
device and enable WeeWX uploading to WU. The Ecowitt apps/ecowitt.net will
still display the Ecowitt pressure values; this cannot be changed.
Gary
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