If the predefined unit of a database field changes (i.e. you want it to
be changed), weewx needs to be told how to interprete the value stored
in this field.
Entries in extensions.py will override the default unit definitions
weewx keeps in a table at runtime (the obs_group_dict).
E.g.
you have more than 4 soil moisture sensors
SM1 - SM4 you can simply assign to the wsview_extended database field
soilMoist1-4
but you have 6 SM sensors and want to use the soilTemp1-2 fields to
store the values
be it via a field_map_extension or via an assignment in [StdCalibrate]
[[Corrections]]
the default unit for SoilTemp1 is degree_celsius - you want it to be
percent, you enter in extensions.py
weewx.units.obs_group_dict['soilTemp1'] = 'group_percent'
you have to make an entry for each database field whose unit
interpretation you want to change
weewx.units.obs_group_dict['soilTemp2'] = 'group_percent'
as you want to use the database fields SoilTemp1 and SoilTemp2, but
don't want °C to be shown in the reports
so it's always the database field name
in the above example - the default unit for soilMoisture1-4 is cb
(centibar) which is the unit group "group_moisture" - you may want it to
be percent as we did for SM5-6
then you will have to add 4 entries to extensions.py
weewx.units.obs_group_dict['soilMoist1'] = 'group_percent'
weewx.units.obs_group_dict['soilMoist2'] = 'group_percent'
weewx.units.obs_group_dict['soilMoist3'] = 'group_percent'
weewx.units.obs_group_dict['soilMoist4'] = 'group_percent'
If you have only 2 WH51 and want to display their readings in percent,
you only need the first two entries
now you should know which field name to put in extensions.py for your
WH51 battery status ... 😎
changes in extensions.py become only effective after a restart of weewx !
On 10.08.2023 17:06, Daidl Himself wrote:
Hi,
thats sounds good, and sqlightbrowser tells me the BatterieStatus
fiels are empty, most likely a type mismatch as you say.
Just wonder, if I map wh51_ch1_batt to /BatteryStatus2/, I need to
mention /BatteryStatus2/ in extension.py. righ?
Rainer Lang schrieb am Donnerstag, 10. August 2023 um 12:51:54 UTC+2:
in principle all seems to be correct in weewx.conf
now, how to check the database: get yourself the sqlitebrowser and
look it up yourself
sudo apt-get install sqlitebrowser
you will have to load your database and you can see everything,
all records etc.
but you may have a unit problem as the Ecowitt battery status
comes over either as integer values (0, 1, 2, 3) or as voltage
e.g. 1.64
As far as I know Gary has described this in the Ecowitt Gateway WiKi
therefore the units to be used (which may be different from
wsview_extended schema) need to be added to
extensions.py
https://github.com/gjr80/weewx-gw1000/wiki/Sensor-battery-states
and make sure you have the respective entries in your extension.py
e.g.
weewx.units.obs_group_dict['wh51_ch1_batt'] = 'group_volt'
weewx.units.obs_group_dict['wn34_ch1_batt'] = 'group_volt'
and
weewx.units.obs_group_dict['wh31_ch1_batt'] = 'group_count'
etc.
the signal levels should also belong to group_count
try that ...
On 10.08.2023 10:48, Daidl Himself wrote:
Hi,
I got a GW2000 and several sensors and use them with the gw1000
driver. So far so good, the most temeratures and stuff is
automatically logged fine.
But, I would like to see trends from the battery values as well.
Searching in the manuals let me learn, the data needs to be
mapped to a field, either creating new ones, or map to existing
ones, which are "free". So, I checked the
"schemas.wview_extended.schema" that is used an made some
mappings in the weewx.conf:
/[GW1000]
# This section is for the Ecowitt Gateway driver.
# How often to poll the API, default is every 20 seconds:
poll_interval = 20
# The driver to use:
driver = user.gw1000
ip_address = 192.168.179.113
port = 45000
show_all_batt = True
[[field_map_extensions]]
extraTemp8 = temp9
rain = p_rain
stormRain = p_rainevent
rainRate = p_rainrate
dayRain = p_rainday
weekRain = p_rainweek
monthRain = p_rainmonth
yearRain = p_rainyear
BatteryStatus1 = ws90_batt
BatteryStatus2 = wh51_ch1_batt
BatteryStatus3 = wh51_ch2_batt
BatteryStatus4 = wn34_ch1_batt
BatteryStatus5 = wh45_batt
BatteryStatus6 = wh75_ch1_batt
signal1 = ws90_sig
signal2 = wh51_ch1_sig
signal3 = wh51_ch2_sig
signal4 = wn34_ch1_sig
signal5 = wh45_sig
signal6 = wh31_ch1_sig
signal7 = wh31_ch2_sig
signal8 = wh31_ch3_sig/
The Temperature and the rain data is all fine, but the battery
data can be shown as $latest and $current, but the image
generator just produced empty fields. Looks for me, as the
"BatteryStatus" fields are not storred in the database. How can I
advice this, and how can I check if there are already part of a
group (I would guess energy would make sense, as the value is Volt)
thanks a lot by the way, for this fantastic peace of software and
user friendly documentation.
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