In message , Dennis Lee
Bieber  writes
>On Mon, 26 Aug 2019 11:26:05 +0100, Adrian  declaimed
>the following:
>
>>The PI is in a IP55 enclosure
>>(https://cpc.farnell.com/olan/ol20112/box-ip55-glanded-150x110x70mm/dp/EN
>>82191), which in turn is mounted about 8ft above floor level in my
>>garage, and the grommets have been trimmed to the minimum required to
>>get the cabling through.
>>
>>As stated elsewhere in the thread, the problem has been seen to persist
>>when the rain gauge is unplugged, suggesting that the problem is with
>>the PI Hat or the Pi itself.  However, as time has passed, the problem
>>has changed.  The fault has become more intermittent, and now it tends
>>to show up when there is rain, but not always.  With rain expected later
>>this week, it will be interesting to see what the outcome is.
>>
>
>       I'd still look for moisture related points in/near the housing. What is
>the humidity registered near the housing when it glitches?
>
>

The humidity (and temperature/pressure) sensor is on the opposite side
of the wall (i.e. outside), but when I've had problems, it has been
variously in the 50% - 80% range (which is not untypical), since it was
installed back in February this year, the mean of the daily means is
63.7%.  The improvement in behaviour doesn't seem related to the
humidity reading.

Adrian
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