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Rpi displayed rain and temperature runaway

Instromet - weather stations and monitoring specialists using analogue dials.
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Chapel
Posts: 86
Joined: Mon 30 Jul 2018 10:23 am
Weather Station: Instromet
Operating System: Raspbian
Location: Binbrook UK
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Rpi displayed rain and temperature runaway

Post by Chapel » Sat 30 Nov 2019 2:07 pm

I am in the Lincolnshire Wolds so normal UK conditions for this time of year.

am running a Pi3 B+ with an Instromet data logger and CuMX and recently experienced an initial error where the rain meter reported heavy rain when it was dry outside, the rain sensor is an Instromet solid state so I stripped it and cleaned the sensor faces and it seemed OK for a few hours then failed again so I sent it back to Instromet who tell me it is OK so I am awaiting its return so it can be fitted again.

So no rain meter at present and interestingly, no rain displayed so I am not sure what to expect when I fit it again.

This morning was cold, -5.0C however it soon warmed up, to 40.0C! I had been meaning to strip and rebuild the wet/dry temperature sensor pack so I dropped it off, fitted the new sensors, made some mechanical changes to make it easier to strip and change the wet bulb wick and connected back up and the temperature continued to rise. The Rpi and data logger had both been off for a couple of hours at this stage. Now an hour later it has topped out at 50.6C

I updated to the latest build of CuMX however that did not resolve the issue so I back on build 3049 and am running a -47.5C offset to bring things back to something near a sensible reading.

Thoughts anyone?

http://binbrook-weather.co.uk/pws_new/

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mcrossley
Posts: 6174
Joined: Thu 07 Jan 2010 9:44 pm
Weather Station: Davis VP2
Operating System: Stretch Lite rPi
Location: Wilmslow, Cheshire, UK
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Re: Rpi displayed rain and temperature runaway

Post by mcrossley » Sat 30 Nov 2019 4:34 pm

Switch on data and debug logging, let it run for a while, then zip up your MXdiags folder and post it here.

Chapel
Posts: 86
Joined: Mon 30 Jul 2018 10:23 am
Weather Station: Instromet
Operating System: Raspbian
Location: Binbrook UK
Contact:

Re: Rpi displayed rain and temperature runaway

Post by Chapel » Sat 30 Nov 2019 7:19 pm

MXdiags.zip
I will leave the diagnostics running.
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Chapel
Posts: 86
Joined: Mon 30 Jul 2018 10:23 am
Weather Station: Instromet
Operating System: Raspbian
Location: Binbrook UK
Contact:

Re: Rpi displayed rain and temperature runaway

Post by Chapel » Sun 01 Dec 2019 9:25 am

MXdiags.zip
This is with the system running for 18 hours ish. I have an offset of -75C now which seems to work for a while however it eventually drifts off.
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Chapel
Posts: 86
Joined: Mon 30 Jul 2018 10:23 am
Weather Station: Instromet
Operating System: Raspbian
Location: Binbrook UK
Contact:

Re: Rpi displayed rain and temperature runaway

Post by Chapel » Sun 01 Dec 2019 4:27 pm

The issue looks to be resolved, I removed the external temperature sensors and added one locally to the data logger and the temperature was -70C ish so the error had to be outside. Eventually I found a short are that had been nibbled by mice I assume. I chopped the damaged lengths of cable out and terminated in a waterproof enclosure and it all came back up correctly. I will have to cable properly come the good weather and protect it with a hose or similar.

At least it is back up and running and I expect the sensor boards to arrive back tomorrow so the rain meter should be up as well. Only issue now is the wet bulb water container shattered in the cold so that will need to replaced ASAP.

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