Some answers/guidance below.
Gary
On Monday, 18 September 2023 at 00:55:03 UTC+10 remy.l...@gmail.com wrote:
However, I have a new question as I haven't been able to understand exactly
the weewx documentation on this subject. I clearly saw that the case of
adding electricity consumption to the database had been processed but I did
not understand the entire explanation given.
To put it simply, I retrieve data in CSV format which I integrate at
regular intervals into the weewx database using wee_import.py (my weather
station does not have a USB output and the data is retrieved from AWEKAS).
To the weather data, I would have liked to add for the period considered:
- CPU load data (unitless)
- The total and used memory of the Raspberry (kB unit)
- The total and used capacity of the SSD (Gb unit)
- Power consumption (Watt unit)
- Water consumption (unit per liter)
I created the fields I needed in the existing WeeWX database without
problem with wee_database
What I couldn't do:
- Create a new base group (for example group_memory with the new Kb and Gb
units). What file exactly should be modified or created and where is it
located?
Compared to the documentation, I would tend to make a file
"/usr/share/weewx/user/memory.py" with in it:
*import weewx.unitsweewx.units.obs_group_dict['rocketForce'] =
'group_memory'weewx.units.USUnits['group_memory'] =
'byte'weewx.units.MetricUnits['group_memory'] =
'byte'weewx.units.MetricWXUnits['group_memory'] =
'byte'weewx.units.default_unit_format_dict['byte'] =
'%.1f'weewx.units.default_unit_label_dict['byte'] = ' byte'*
Is my approach correct? How to create the units kB and gB?
Not quite. First up, no need for memory.py, just use
/usr/share/weewx/user/extensions.py, that is what is is meant for. Next,
WeeWX already has a unit named byte which is used with unit group group_data.
You can certainly define your own unit group group_memory but why, it just
adds the possibility for confusion. The one thing WeeWX does not have is
unit names representing kilobyte and gigabyte (and megabyte), these you
will need to define or otherwise handle yourself. To add units kilobyte,
megabyte and gigabyte you need to define the unit conversion functions for
each unit as well as specifying a number format and unit label for each
unit. We generally specify unit conversion functions using lambda
functions, in the case unit kilobyte we need to specify how to convert from
kilobyte to each of the other units that may be used within unit group
group_data; ie kilobyte to bit, kilobyte to byte, kilobyte to megabyte and
kilobyte to gigabyte. We might do this as follows:
weewx.units.conversionDict['kilobyte'] = {'bit': lambda x: x * 8192.0,
'byte': lambda x: x * 1024.0,
'megabyte': lambda x: x / 1024.0,
'gigabyte': lambda x: x /
1048576.0}
Likewise for each of the other group_data units. To define a unit label and
number format for the kilobyte unit you would use something like:
weewx.units.default_unit_label_dict['kilobyte'] = ' kB'
weewx.units.default_unit_format_dict['kilobyte'] = '%.1f'
Again, likewise for the other units.
Overall you would end up with something like:
weewx.units.conversionDict['bit'] = {'byte': lambda x: x / 8.0,
'kilobyte': lambda x: x / 8192.0,
'megabyte': lambda x: x / 8388608.0,
'gigabyte': lambda x: x / 8589934592.0}
weewx.units.conversionDict['byte'] = {'bit': lambda x: x * 8.0,
'kilobyte': lambda x: x / 1024.0,
'megabyte': lambda x: x / 1048576.0,
'gigabyte': lambda x: x / 1073741824.0
}
weewx.units.conversionDict['kilobyte'] = {'bit': lambda x: x * 8192.0,
'byte': lambda x: x * 1024.0,
'megabyte': lambda x: x / 1024.0,
'gigabyte': lambda x: x /
1048576.0}
weewx.units.conversionDict['megabyte'] = {'bit': lambda x: x * 8388608.0,
'byte': lambda x: x * 1048576.0,
'kilobyte': lambda x: x * 1024.0,
'gigabyte': lambda x: x / 1024.0}
weewx.units.conversionDict['gigabyte'] = {'bit': lambda x: x * 8589934592.0,
'byte': lambda x: x
* 1073741824.0,
'kilobyte': lambda x: x
* 1048576.0,
'megabyte': lambda x: x * 1024.0}
weewx.units.default_unit_label_dict['kilobyte'] = ' kB'
weewx.units.default_unit_format_dict['kilobyte'] = '%.1f'
weewx.units.default_unit_label_dict['megabyte'] = ' MB'
weewx.units.default_unit_format_dict['megabyte'] = '%.1f'
weewx.units.default_unit_label_dict['gigabyte'] = ' GB'
weewx.units.default_unit_format_dict['gigabyte'] = '%.1f'
Note the above uses the binary interpretation of a kilobyte; ie 1kB = 1024
bytes, 1MB = 1024kB and 1GB = 1024MB. If you wish to use the Metric
interpretation of a kilobyte; ie 1kB = 1000 bytes, 1MB = 1000kB and 1GB =
1000MB some of the above conversion factors will need to be changed
accordingly.
- For data that is unitless such as charge1, charge5 and charge15 (assuming
that the field names of the weewx.sdb database are charge1,charge5,charge15
and that the names of the header fields of the CSV file to import are
charge1, charge5 and charge15), will the import be done by putting in the
CSV import configuration file for wee_import.py:
source = CSV
[CSV]
....
[[FieldMap]]
dateTime = dateTime, unix_epoch
....
charge1 = charge1
charge5 = charge5
charge15 = charge15
WeeWX has unit group group_count and unit count to handle unitless fields.
All you need to do is assign your fields to group_count in the same way you
assigned your wet bulb field to group_temperature.
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