>
> Hallo
>
my plan [snow] and [snowRate] , "cm", "group_snow"
1. /home/weewx/snow value 1.5 (cm) snow --> it is the value of the file
snow
2. snowhes.py reads the value of [snow] (1.5)
3. Write the value 1.5 to database (1.5 cm) as [snowRate] --> the result
of the current snow
4. and find the value between current 1.5 (cm) [snowRate] in database an
the value snow current /home/weewx/snow
5. the 'delta' [snowRate] and [snow] value
1.5 - 1.5 result 0.0
6. the result 0.0 write as [snow] in to database
I hope to be able to represent
1. $current.snowl = 0.0 cm
2. Today 1.5 cm snow
3. last snow by change "lastrain.py" on 10.01.2017 09:00
1 day, 12 hours,
34 minutes ago
and now the syslog result
Jan 14 13:06:11 wetterba weewx[2651]: snowdepth: SNOW value of 1.5
Jan 14 13:06:11 wetterba weewx[2651]: snowdepth: found usUnits of 16
Jan 14 13:06:11 wetterba weewx[2651]: engine: Caught unrecoverable
exception in engine:
Jan 14 13:06:11 wetterba weewx[2651]: **** 16
Jan 14 13:06:11 wetterba weewx[2651]: **** Traceback (most recent call
last):
Jan 14 13:06:11 wetterba weewx[2651]: **** File
"/home/weewx/bin/weewx/engine.py", line 847, in main
Jan 14 13:06:11 wetterba weewx[2651]: **** engine.run()
Jan 14 13:06:11 wetterba weewx[2651]: **** File
"/home/weewx/bin/weewx/engine.py", line 158, in run
Jan 14 13:06:11 wetterba weewx[2651]: ****
self.dispatchEvent(weewx.Event(weewx.STARTUP))
Jan 14 13:06:11 wetterba weewx[2651]: **** File
"/home/weewx/bin/weewx/engine.py", line 222, in dispatchEvent
Jan 14 13:06:11 wetterba weewx[2651]: **** callback(event)
Jan 14 13:06:11 wetterba weewx[2651]: **** File
"/home/weewx/bin/weewx/engine.py", line 501, in startup
Jan 14 13:06:11 wetterba weewx[2651]: ****
self._catchup(self.engine.console.genStartupRecords)
Jan 14 13:06:11 wetterba weewx[2651]: **** File
"/home/weewx/bin/weewx/engine.py", line 606, in _catchup
Jan 14 13:06:11 wetterba weewx[2651]: **** origin='hardware'))
Jan 14 13:06:11 wetterba weewx[2651]: **** File
"/home/weewx/bin/weewx/engine.py", line 222, in dispatchEvent
Jan 14 13:06:11 wetterba weewx[2651]: **** callback(event)
Jan 14 13:06:11 wetterba weewx[2651]: **** File
"/home/weewx/bin/user/snowhes.py", line 57, in newArchiveRecord
Jan 14 13:06:11 wetterba weewx[2651]: **** snow_total =
convert(value_vt, event.record['usUnits']).snow_val
Jan 14 13:06:11 wetterba weewx[2651]: **** File
"/home/weewx/bin/weewx/units.py", line 1189, in convert
Jan 14 13:06:11 wetterba weewx[2651]: **** conversion_func =
conversionDict[val_t[1]][target_unit_type]
Jan 14 13:06:11 wetterba weewx[2651]: **** KeyError: 16
Jan 14 13:06:11 wetterba weewx[2651]: **** Exiting.
my file snowhes.py
"""Put this file, snow.py, in the weewx 'user' directory, then modify
weewx.conf
with something like this:
[SnowDepth]
filename = /home/weewx/snow
To use as a service:
[Engine]
[[Service]]
data_services = user.snowhes.SnowDepth
"""
import syslog
import weewx
from weewx.engine import StdService
from weewx.units import ValueTuple, convert
class SnowDepth(StdService):
def __init__(self, engine, config_dict):
super(SnowDepth, self).__init__(engine, config_dict)
self._last_snow = 0.0
d = config_dict.get('SnowDepth', {})
self.filename = d.get('filename', '/home/weewx/snow')
syslog.syslog(syslog.LOG_INFO, "snowdepth: using %s" %
self.filename)
self.bind(weewx.NEW_ARCHIVE_RECORD, self.newArchiveRecord)
def newArchiveRecord(self, event):
#try:
with open(self.filename) as f:
snow_val = f.read()
syslog.syslog(syslog.LOG_DEBUG, "snowdepth: found value of %s"
% snow_val)
syslog.syslog(syslog.LOG_INFO, "snowdepth: SNOW value of %s" %
snow_val)
# Convert our value to a type ValueTuple. We know it is in cm
and
# let's use group_snow (could use group_length too)
value_vt = ValueTuple(float(snow_val), 'cm', 'group_snow')
# Now convert the cm value to the same units as used in our
record
# The unit system of the record is in the records 'usUnits'
field
snow_total = convert(value_vt, event.record['usUnits']).snow_val
#event.record['some_field_name'] = value_conv
syslog.syslog(syslog.LOG_INFO, "snowdepth: found SNOW-value of
%s" % snow_total)
delta = weewx.wxformulas.calculate_rain(snow_total,
self._last_snow)
self._last_snow = float(snow_total)
event.record['snowRate'] = float(self._last_snow)
event.record['snow'] = float(delta)
#except Exception, e:
syslog.syslog(syslog.LOG_ERR, "snowdepth: SYSLOG ERR cannot
read value: %s" % e)
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