Investigating logs for sporadic loss of sensors during the night

[Invisible Man]

Hi,
Sometimes during the night I lose data from my sensors a couple of hours. I've had a look at the logs, but can't see any ERROR message. What type of message should I be looking for in weewx.log?

Example: https://biotmeteo.masdescrocodiles.fr/daytempdew.png
My weather station is an EcoWitt HP2551. It uses "Interceptor". Weewx 4.10.2 is running on a Raspberry Pi.

Thanks,

Axelle.

[Tom Keffer]

Hard to say without actually seeing the logs, but these "middle-of-the-night' dropouts are often caused by weak sensor batteries.

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[michael.k...@gmx.at]

If it is not the battery, check the signal strength. With the Interceptor Driver I don't know how to get the readings for the signal strength. But you could try to find out and then see if there are drops in any way. Sometimes it doesn't need much to have an inferior signal strength. I, for instance, have my gw2000 behind my wall-mounted television. If I tilt it too much, the signal for my WS90 drops from perfect to almost nothing.

[Invisible Man]

> Hard to say without actually seeing the logs, but these "middle-of-the-night' dropouts are often caused by weak sensor batteries.

Yes, that's what I though, but I have no logs complaining about low batteries...

[Invisible Man]

Yes, very possible, and during the night, house shutters are closed which probably decreases signal strength. However, I was expecting to see an anomaly report in the logs, and I just don't see anything at all.

Isnt' there a message about "loss of a sensor" or something?

[michael.k...@gmx.at]

No, in this particular case, there isn't. There is just no value. The temp sensor emits it's reading. If you are lucky, the console catches this reading, there is no duplex or acknowledge between the sensor and the console. The driver then simply gets no value and unless no other special treatment is implemented or configured, no value is as good as any other value, technically spoken. With WeeWX you can implement alarms, there are also examples for dooing this, it should be possible to implement and configure notifications, when there is no outTemp (or whatever) value: https://github.com/weewx/weewx/blob/master/examples/alarm.py