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cw · Joined: 25 Jul 2005 Posts: 8 Location: Lindon, Utah

Have any of you signed up to receive the data quality reports from CWOP. Ocassionally I have temperature data that is stastically inaccurate but most of my barometer readings are. I have tried fine tuning my barometer on the console but regardless of what I do usually at least 50% of my readings are outside of where they should be. Just wondering if anyone else has had this experience.

randy · Joined: 13 Dec 2006 Posts: 3

I too see bad pressure being sent.
All of my other parameters are two MADIS thumbs up but the pressure is bad. I have noticed that the sent value is never what is displayed.

The wunderground data seems to agree with the display. Only the CWOP data is off (maybe delayed?)

randy · Joined: 13 Dec 2006 Posts: 3

OK, I noticed that Mark had not responded to this forum since Feb so I started rooting around in the source. I found that in cwop.c he is using a calculated value for the altimiter pressure. This value does not agree with the Vantage Pro's calculated altimiter pressure. I have not tried to figure out the error in the calculation but I found how to send the VP2's Altimeter pressure.

In the file cwop.c at about line 140 you will find:
length += sprintf (&cwopBuffer[length], "b%5.5d", (int)(10 * wvutilsConvertBPInchesToMillibars((float)notify->altimeter/1000.0)));

change it to:
// length += sprintf (&cwopBuffer[length], "b%5.5d", (int)(10 * wvutilsConvertBPInchesToMillibars((float)notify->barom/1000.0)));

note only the word altimeter changed to barom.

Re compile by changing to the parent dir and running make then "make install"

restart your daemons or reboot your system. Your cwop reported values should now match your display if you have selected mb or hPa for display units.

I will post again once a complete day has gone by and quality reports have caught up.

Randy
CW1840