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Re: [Owfs-developers] Reading latesttemp
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From: Mick S. <mi...@su...> - 2020-10-08 19:00:34
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Just looked at it again and all sensors are now reading correctly, so I am wondering if there was a bad connection somewhere. As they are all working I will try to see if I can recreate the problem, but not sure I will be able to. I'll get back to you if I discover anything further. Thanks Mick On 08/10/2020 19:47, Mick Sulley wrote: > 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 >> >> >> _______________________________________________ >> Owfs-developers mailing list >> Owf...@li... >> https://lists.sourceforge.net/lists/listinfo/owfs-developers > > > _______________________________________________ > Owfs-developers mailing list > Owf...@li... > https://lists.sourceforge.net/lists/listinfo/owfs-developers |
