This is a test setup, all sensors are in a breadboard on the bench,
power is from a Meanwell unit set to 5.1 volts, which is what I measure
at the sensors. So I am pretty confident it is not a wiring or power
supply problem.
Is there any way to determine if the simultaneous command is getting to
all of the chips?
I am pretty confident that if I power cycle it all the problem will go
away and I won't be able to recreate it, so I am trying to investigate
as much as I can while the situation exists.
Thanks
Mick
On 08/10/2020 17:27, Jan Kandziora wrote:
Am 08.10.20 um 15:07 schrieb Mick Sulley:
But owwrite /simultaneous/temperature 1 should trigger a conversion? and
reading latesttemp should then be correct. Here is another. Latesttemp
returns 85 even after owwrite /simultaneous/temperature 1, but read
temperature12 and it works again. I don't understand why!
Most likely it's a problem with power. Do you power each chip
separately, or do they all pull, from the same +5V line?
I have a few more in this state at the moment, I am sure I could fix
them all with a single temperature12 read to each and they would then be
fine, but I would really like to understand what the problem is
You could try to find out if the simultaneous command is not going
through to all chips (chips never read 85°C on latesttemp) or if you
still get those spurious resets.
But it's only a debugging tool. In a production setup, it would only
ever mask the underlying problem and return a wrong ages-old temperature
instead.
Kind regards
Jan
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