cat cputemp-opi5p.dat
105.6
All of my cpu temps (I have 6 total) look just like the above
(cputemp-opi5p.dat, -op5.dat, -pi4b1.dat, -pi3b2.dat, -pi5r.dat, and
cputemp-ser8.dat)
The 6 .dat files are refreshed (rewritten) every 5 minutes, a minute before
weewx runs, and scp'd to the server running weewx for the extensions.py to
read; each read()
only goes to its own file.
I've attached my *latest* extensions.py -- you'll see the 6 temperature
readings, 2 are from orange pi's, 1 is from an SER8, and 3 are from
raspbery pi's.
You may see my python statements and you may find fault with them, but in
order to get them working I have already done way more
reading/experimenting/testing than I
wanted to in order to get them to run without crashing. So they're tested
as - is. What I'm still trying to figure out (hence the try: except:
finally:) is if the read or cast fails, to catch it and
just plug in a ringer (nominal) value for that run. But something about the
big weewx python engine doesn't like the try: added into extensions.py, it
just give a *systemd[1]: weewx.service: Main process exited, code=exited,
status=1/FAILURE*
in the syslogs, and I have to comment out the try: in extensions.py in
order for it to run.
Hope this makes it clearer as to the situation.
Thanks --
On Wednesday, April 16, 2025 at 11:20:09 PM UTC-5 Susan Mackay wrote:
> Probably not the problem (as it this relates to code above the error line)
> but you have several places where you open a file, read every line and
> process the data in that line but only pass back the last value read. This
> seems to be a waste of a lot of processing
> .
> I agree with the comments above - the extraneous NULL in the file would
> seem to be the issue. Perhaps you need to look at that and see if you can
> fix the problem in the file. (Probably not as I'm guessing by the comments
> that the file is written by the OS.) Try 'rstrip("\0")' after the 'read()'
> Susan
> On Thursday, 17 April 2025 at 5:07:48 am UTC+10 Karen K wrote:
>
>> [email protected] schrieb am Mittwoch, 16. April 2025 um 06:31:01
>> UTC+2:
>>
>> Apr 15 16:00:16 PI4B1 weewxd[268425]: weewx[268425] CRITICAL __main__:
>> **** ValueError: could not convert string to float: '94.8\x00'
>>
>>
>> May be the nul character at the end of the file to read is the problem.
>> In the error message above it is expressed as "\x00".
>>
>
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#!/usr/bin/env python
# Copyright (c) 2009-2015 Tom Keffer <[email protected]>
#
# See the file LICENSE.txt for your full rights.
#
"""User extensions module
This module is imported from the main executable, so anything put here will be
executed before anything else happens. This makes it a good place to put user
extensions.
"""
import locale
# This will use the locale specified by the environment variable 'LANG'
# Other options are possible. See:
# http://docs.python.org/2/library/locale.html#locale.setlocale
locale.setlocale(locale.LC_ALL, '')
import weewx.units
#weewx.units.obs_group_dict['waterTemp'] = 'group_temperature'
#weewx.units.obs_group_dict['LakeElev'] = 'group_altitude'
import re
import os
from weewx.engine import StdService
weewx.units.obs_group_dict['LakeElev'] = 'group_lake'
weewx.units.USUnits['group_lake'] = 'feetMSL'
weewx.units.default_unit_format_dict['feetMSL'] = '%.2f'
weewx.units.default_unit_label_dict['feetMSL'] = ' ftMSL'
class AddMyData(StdService):
def __init__(self, engine, config_dict):
# Initialize my superclass first:
super(AddMyData, self).__init__(engine, config_dict)
# Bind to any new archive record events:
self.bind(weewx.NEW_ARCHIVE_RECORD, self.new_archive_packet)
def new_archive_packet(self, event):
# putting / declaring a variable here crashes it
#(code that reads two measurements from a file)
with open("/home/pi/wxdata/weewxmbdata.dat") as f:
value1 = 600.00 #initialize anyway
value2 = 123.45 #initialize anyway
for line in f:
numbers_str = line.split()
numbers_float = [float(x) for x in numbers_str]
value1 = numbers_float[0]
value2 = numbers_float[1]
event.record['LakeElev'] = value1
# event.record['lakeWaveheight'] = value2
with open("/home/pi/cputemp-pi4b1.dat") as f:
value3 = 50.0
for line in f:
numbers_str = line.split()
numbers_float = [float(x) for x in re.findall("\d+\.\d+", line)]
value3 = numbers_float[0]
value3 = (value3 * 9/5) + 32
event.record['extraTemp3'] = value3
#
with open("/home/pi/cputemp-pi3b2.dat") as f:
value4 = 50.0
for line in f:
numbers_str = line.split()
numbers_float = [float(x) for x in re.findall("\d+\.\d+", line)]
value4 = numbers_float[0]
value4 = (value4 * 9/5) + 32
event.record['extraTemp4'] = value4
# #weewx was -occasionally- complaining about "UnboundLocalError: local variable 'value5' referenced before assignment"
# I couldn't find a clue as to what was different about value5 from 4 or 3 ... so try changing to 5x!
with open("/home/pi/cputemp-pi5r.dat") as f:
value5x = 80.0 # initialize a "ringer" value, just in case
for line in f:
numbers_str = line.split()
numbers_float = [float(x) for x in re.findall("\d+\.\d+", line)]
value5x = numbers_float[0]
value5x = (value5x * 9/5) + 32
event.record['extraTemp5'] = value5x
#
# orangepi5B now places actual float in its .dat, necessitating cast as float
#Modify this and place in RPI3 extraTemp2
with open('/home/pi/cputemp-opi5.dat') as f: #sensors -f requested temps in F
degf = 80.0 # initialize a "ringer" value, just in case
degf = float(float(f.read())) #this is OPI5B
event.record['extraTemp6'] = degf
with open('/home/pi/cputemp-opi5p.dat') as f: #sensors -f requested temps in F
# try:
degf2 = 80.0 # initialize a "ringer" value, just in case
degf2 = float(float(f.read())) #this is OPI5P
print("degf2 okay")
# except:
# degf2 = 100.0
# print("degf2 exception!")
# finally:
event.record['extraTemp7'] = degf2
with open('/home/pi/cputemp-ser8.dat') as f: #sensors -f requested temps in F
degf3 = float(float(f.read())) #this is SER8
event.record['extraTemp8'] = degf3
