On Thu, 19 Jul 2012, Tom Russo wrote:
On Thu, Jul 19, 2012 at 01:34:14PM -0700, we recorded a bogon-computron collision of
the <[email protected]> flavor, containing:
Well, rain I can do... But Davis I cannot. I have enough parts for two or
three LaCrosse stations and one Dallas One-Wire station.
No good.
On the other hand, maybe if you can put one LaCrosse together and observe
the Own Weather Data screen over the span of a day or two of rain to see if
it reports data properly.
I can possibly put one together indoors and simulate rain into the sensor, then
simulate more during a 2nd day. I want to finish my bike project first though
before I get distracted. We're not having rain right now in the northwest
either, but it's usually not long until we do.
The issue is that Xastir needs a weather station to report "total rain" and
uses the (monotonically increasing) value over time to compute 24-hour, 1-hour,
and since-midnight values, which it then reports as an APRS WX report.
The Davis code (and by extension, the LaCrosse code) reads 24-hour rain data
from the weather station and stores it in wx_rain_total --- incorrectly, as
far as I can tell.
Later, Xastir uses "cycle_weather" and uses this wx_rain_total to compute
24-hour and other values, but since Davis is already storing it as 24-hour,
it's going wrong because the value isn't a steadily increasing thing.
Also, the Davis code, unlike other code, doesn't call "compute_rain" right
after reading data, so some of the numbers are complete junk coming out
of the parsing code.
The patch I sent to Mike copied a compute_rain call out of other parts of the
code, but I'm not convinced it's right yet --- especially since the Meteo
code (which is used also by LaCrosse) pulls 24-hour data out of the wx station,
not total rain.
I remember having to add the rain computation code because some weather
stations didn't provide enough data, or data in the correct format, that we
needed. Perhaps I messed up the Davis code at that point. The weather code is
a complete mess, but was so before I started hacking into it. It could use a
complete re-write.
--
Curt, WE7U. http://wetnet.net/~we7u
APRS: Where it's at! http://www.xastir.org
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