Dayfile Min Temp / Time wrong

[kasper58]

I have notice of since b3022 th Day file min temp/time is always set a 0, 15:46,
I have manually corrected the previous 2 days, but this morning the new day was as shown.

Regards Warren

Dayfile.JPG

[steve]

There seems to be a problem with the station, or the USB connection:

2015-03-27 15:43:55.171 Start Synchronising
2015-03-27 15:45:00.061 Updating CWOP
2015-03-27 15:46:20.037 Station clock 15:46:20 drift = 9 seconds
2015-03-27 15:46:23.055 The operation has timed-out.
2015-03-27 15:46:23.055 Error reading data from station - it may need resetting
2015-03-27 15:46:25.044 Stop Synchronising
2015-03-27 15:46:26.058 The operation has timed-out.
2015-03-27 15:46:26.059 Error reading data from station - it may need resetting
2015-03-27 15:46:29.062 The operation has timed-out.
2015-03-27 15:46:29.062 Error reading data from station - it may need resetting
2015-03-27 15:46:32.065 The operation has timed-out.
2015-03-27 15:46:32.065 Error reading data from station - it may need resetting
2015-03-27 15:46:32.067 Ignoring bad data: pressure = -0.200000000000045
2015-03-27 15:46:32.068 offset = 0
New monthly record, month = 3: 2015-03-27 15:46 -2.707 "Low dew point" 2015-03-26 15:44 -1.597
New monthly record, month = 3: 2015-03-27 15:46 -2.844 "Low apparent temp" 2015-03-26 15:44 -2.647
2015-03-27 15:46:32.635 Warning: large difference in rain gauge tip count: 826
2015-03-27 15:46:32.636 Ignoring reading 1

But the fact that it happened just after Cumulus was doing the 'synchronisation' thing is possibly relevant. Is it happening at the same time every day?

[kasper58]

Hi Steve, yes it appears to be the same time every day... I will let run tonight and see what it does tomorrow

[steve]

To see if it's related to the Synchronisation somehow, you could try turning that off for a while to see what happens. You could also try shifting the time that it happens, by stopping Cumulus at about 15:30 and starting it up again an hour or two later, to see if the time of the problem moves with it.

[kasper58]

Hi Steve.

Restarted CumulusMX without data just before midnight, at 23:40 updating CWOP then all turns to custard for about a minute.

Next day shutdown MX, re-instated/merged & cleaned up old data files with incorrect min temp.

This morning still have sync issues at 23:40 and incorrect min temp

Cheers Warren

[steve]

That seems to confirm that it's related to the synchronisation code. But others are using it without this problem, and I ran MX for months with my Fine Offset without this problem. During synchronisation, it reads every half a second rather than the usual 10 seconds. Perhaps that causes a problem with the USB interface on your system for some reason. Is this on a Raspberry Pi? You could try turning sync off, for now at least.

[kasper58]

Is this on a Raspberry Pi? You could try turning sync off, for now at least.

Yes it is, turning off the sync appears to have worked for now.

Thanks
Warren

[steve]

Thanks - I'll have a look at the sync code, but I'm pretty sure that the only difference is that it reads every half a second instead of every 10 seconds. I don't know why that would cause a problem; I'm not aware of anyone else having experienced this.

[mcrossley]

One thought, is your RPi firmware (and OS) up to date, the USB handling was flaky in earlier versions.

[kasper58]

Hi Mark

Yes the Pi is all up-to-date.

One other thought, although I have it set as a Fine Offset, it is it fact a rebadged Aercus Instruments WS1093.
Shouldn't make any difference.

Regards Warren

[steve]

How is the station connected to the Pi - directly, or via a hub (powered or not?)?

[kasper58]

Directly, the pi is headless and is serviced by ssh.

Regards

[steve]

I've asked this question before, but no-one seems to know - does the original Pi USB port reliably supply enough power for the console?

[water01]

I would doubt it. Until the Raspberry Pi B+ they always advised everyone to run USB items on a power hub. Not only did the original PI not produce enough power for most USB devices, but it also suffered with power fluctuations. Only after the B+ did they solve that problem but they still even with the Raspberry 2 advise a powered hub if you are running power hungry devices such as a hard disk drive.

[kasper58]

I'm not sure that the console draws power from the USB as it powered on board by batteries or an external power supply.