Stuck Pressure Reporting to CWOP

mcrossley · **Posted:** Tue Sep 20, 2011 10:04 pm

steve wrote:

I don't keep old versions of Cumulus, but someone else may have a copy.

Steve may not thank me for this as I know he only supports the latest version, but you could try the Wayback machine, which seems to have the downloads back to 2008 archived... http://wayback.archive.org/web/*/http:/ ... /downloads

pdthull · **Posted:** Wed Sep 21, 2011 4:48 pm

Interesting. Thanks. I'll give it a try.

pdthull · **Posted:** Fri Sep 23, 2011 10:04 pm

Loaded 1.9.2. CWOP pressure still stuck. Loaded 1.9.0 build 958 and CWOP pressure is reporting fine...not stuck.

steve · **Posted:** Sat Sep 24, 2011 9:46 am

pdthull wrote:

Loaded 1.9.2. CWOP pressure still stuck.

If you zip up the diags folder and attach it, I'll see if I can see anything.

I've looked at the code that reads the barometer data in 1.9.0 and compared it with the current code; it's exactly the same, and 1.9.0 uses the same Davis DLL as 1.9.1 and 1.9.2. So it's hard to see why one works on your system and not the other.

Edit: Do you have '1-minute barometer update' selected? If so, you could try unsetting that and restarting Cumulus.

steve · **Posted:** Sun Sep 25, 2011 5:40 pm

I've done a small change in build 1016 which might help. But as I have no idea what the problem is, and I can't reproduce it, confidence is low. But I've also added more diagnostics to the debug log which might help get closer to understanding the problem.

plshakes · **Posted:** Wed Dec 14, 2011 8:24 pm

Steve,
was this issue ever resolved? I have exacly the same problem when attempting auto updates to the Met Office WOW site, ie the sea level pressure is correct initially but stays at the same value for subsequent updates. My VP2 is new so should have the latest firmware etc. I have no serial ports on my PC so have switched on the CP210X USB to Serial Converter. Apart from this Cumulus works fine, logs everything fine!
Peter

steve · **Posted:** Wed Dec 14, 2011 9:50 pm

plshakes wrote:

Steve,
was this issue ever resolved? I have exacly the same problem when attempting auto updates to the Met Office WOW site, ie the sea level pressure is correct initially but stays at the same value for subsequent updates.

No, it wasn't, but your problem is not the same problem, that only affects CWOP which requires altimeter pressure. WOW uses sea level pressure, as displayed on the main screen.

Please do the following:

1. Turn on the debug log, leave to run for a while (several WOW updates), then attach the debug.log file.
2. Zip up the diags folder and attach it.
3. Give a link to your WOW station page
4. Tell me what the pressure reading actually was at the time of each WOW update.

plshakes · **Posted:** Thu Dec 15, 2011 6:20 pm

Hi Steve,

I followed your instructions and left the auto updating running for 5 mins. Diag folder and debug.log attached. These are the readings of SLP in my Dec11log
1716 999.63
1717 999.56
1718 999.46
1719 999.43
1720 999.43
On WOW they all appeared as 999.66
http://wow.metoffice.gov.uk/tabulardata ... oShow=mslp

Thanks, Peter

steve · **Posted:** Thu Dec 15, 2011 8:40 pm

I hadn't realised that you were uploading to WOW every minute and the pressure was only staying on the same value for a few minutes. It happens because WOW requires pressure in inHg, and I convert and then round to 2 dp. So all of those pressure figures you quote are sent as the same value (29.52). I suppose I could send 3 dps...

plshakes · **Posted:** Thu Dec 15, 2011 11:53 pm

Yes, I try to send readings every minute, the VP2, being a new version, records pressures every minute, but looking at the weatherlink values in inches
1716 29.519
1717 29.517
1718 29.514
1719 29.513
1720 29.513
the first two if rounded to 2dp would be displayed as 999.66 but the following three should be 999.32?

Peter

steve · **Posted:** Fri Dec 16, 2011 8:51 am

Your pressures in mb at those times, as supplied by the Davis DLL (which does the conversion from inHG to mb) to 3 dp, were:

1716: 999.631
1717: 999.631
1718: 999.564
1719: 999.462
1720: 999.428

I convert from mb to inHg by multiplying by 0.0295333727. All of those values convert to 29.52 inHg to 2 dp, and that's what Cumulus sent to WOW.

plshakes · **Posted:** Fri Dec 16, 2011 4:56 pm

Ok Steve,
so pressures sent to WOW will only change in steps of ~0.3 mb. All is now clear! I'll look forward to a future tweak to send the inches values to 3dp,
thanks for your explanation,
Peter

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Stuck Pressure Reporting to CWOP

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