Hi all,
New weewx user here using a home brew weather station based on Arduino's
and nRF24L01+ radios.
I wrote my own driver to accept packets on the nRF24L01 attached to the RPi
and weewx is happily accepting my LOOP packets and producing reports every
archiving period. I've also managed to import the last 18 months of weather
data I had collected prior to installing weewx. Until today, weewx has
been going fantastically.
Today I encountered a weird issue which I've not found described elsewhere.
I was getting a divide by zero error during graph generation and none of my
graphs were being updated.
I had a period of 24+ hours where my humidity was stuck at 100%. As soon as
it dropped to 99%, the error went away and all of my graphs were updated.
It turns out that if you specify only a maximum value for a graph, and have
a period where the reading for the entire graph period was at that maximum,
you get the divide by zero error.
Is this a known bug?
Here's the relevant section from the log:
Sep 25 06:26:19 hub-pi weewx[436]: reportengine: Caught unrecoverable
exception in generator weewx.imagegenerator.ImageGenerator
Sep 25 06:26:19 hub-pi weewx[436]: **** float division by zero
Sep 25 06:26:19 hub-pi weewx[436]: **** Traceback (most recent
call last):
Sep 25 06:26:19 hub-pi weewx[436]: **** File
"/usr/share/weewx/weewx/reportengine.py", line 239, in run
Sep 25 06:26:19 hub-pi weewx[436]: **** obj.start()
Sep 25 06:26:19 hub-pi weewx[436]: **** File
"/usr/share/weewx/weewx/reportengine.py", line 273, in start
Sep 25 06:26:19 hub-pi weewx[436]: **** self.run()
Sep 25 06:26:19 hub-pi weewx[436]: **** File
"/usr/share/weewx/weewx/imagegenerator.py", line 32, in run
Sep 25 06:26:19 hub-pi weewx[436]: ****
self.genImages(self.gen_ts)
Sep 25 06:26:19 hub-pi weewx[436]: **** File
"/usr/share/weewx/weewx/imagegenerator.py", line 235, in genImages
Sep 25 06:26:19 hub-pi weewx[436]: **** image = plot.render()
Sep 25 06:26:19 hub-pi weewx[436]: **** File
"/usr/share/weewx/weeplot/genplot.py", line 195, in render
Sep 25 06:26:19 hub-pi weewx[436]: **** sdraw =
self._getScaledDraw(draw)
Sep 25 06:26:19 hub-pi weewx[436]: **** File
"/usr/share/weewx/weeplot/genplot.py", line 222, in _getScaledDraw
Sep 25 06:26:19 hub-pi weewx[436]: **** ((self.xscale[0],
self.yscale[0]), (self.xscale[1], self.yscale[1])))
Sep 25 06:26:19 hub-pi weewx[436]: **** File
"/usr/share/weewx/weeplot/utilities.py", line 317, in __init__
Sep 25 06:26:19 hub-pi weewx[436]: **** self.yscale =
-float(lri[1] - uli[1]) / float(urs[1] - lls[1])
Sep 25 06:26:19 hub-pi weewx[436]: **** ZeroDivisionError: float
division by zero
Sep 25 06:26:19 hub-pi weewx[436]: **** Generator terminated
Sep 25 06:26:19 hub-pi weewx[436]: copygenerator: copied 0 files to
/var/www/html/weewx
Here's the relevant section from the skin.conf:
[[[dayhum]]]
yscale = None, 100, None
[[[[outHumidity]]]]
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