The failure happened for about 10-20 minutes, reading about every 10
seconds or so, then it recovered and is reading fine again.
All devices are powered.
I could change my code so that it reads fasttemp and if that is 85 it
reads through the others to try to find a good read. Is that a sensible
thing to do?
Thanks
Mick
On 19/02/2019 12:49, Jan Kandziora wrote:
Am 19.02.19 um 10:39 schrieb Mick Sulley:
My control system has detected a no read (85) on a DS18B20 temp sensor,
however if I look at it via owhttpd I can see temperature, temperature11
and temperature12, but 85 for fasttemp, temperature9 and temperature10.
How can that happen? The sensor had been working OK. I am running
3.2p3 on a Raspberry Pi
Each reading of the uncached temperature nodes (but latesttemp) triggers
a new conversion. The browser orders owhttpd to do exactly that. What
you see isn't one conversion but a series of conversions of which some
failed because of a Power-On-Reset during conversion (that's the 85°C
reading) and some failed not.
Check your cabling. Also check if powering the chip helps.
Kind regards
Jan
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