Hello
I have a current cost electricity meter connect to a linux computer via a
usb cable
On the linux computer is a script that every 20seconds loggs the watt and
temp readings from the current cost meter to a txt file and RRD file
I can generate the RRD graphs into the weewx public_html directory and
display them accrodingly
I know that weewx is predominatly for displaying weather data but I would
like weewx to handle the watt data, so I have tried to save the readings
into the weewx.sdb
I found this version of pond.py from the weewx user groups and it works
with no errors
Following advice given in the weewx help files I can now display the data
in the various html files display graphs etc
I have one problem, pond.py takes the readings from the first line in the
txt file (readings.txt)
how do I modify pond.py to take its readings from the last line of the txt
file, because file the last line of my txt file holds the latest data
thank you for any help
import syslog
import weewx
from weewx.wxengine import StdService
class PondService(StdService):
def __init__(self, engine, config_dict):
super(PondService, self).__init__(engine, config_dict)
d = config_dict.get('PondService', {})
self.filename = d.get('filename', '/var/www/html/data/reading.txt')
syslog.syslog(syslog.LOG_INFO, "pond: using %s" % self.filename)
self.bind(weewx.NEW_ARCHIVE_RECORD, self.read_file)
def read_file(self, event):
try:
with open(self.filename) as f:
#value = f.read()
line = f.readline()
value = line.split(',')
syslog.syslog(syslog.LOG_DEBUG, "pond: found value of %s" % value)
event.record['ccwatt'] = float(value[0])
event.record['cctemp'] = float(value[1])
except Exception, e:
syslog.syslog(syslog.LOG_ERR, "pond: cannot read value: %s" % e)
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