So it was a bit unclear, I only teach for a living :->. I've fixed it a bit.
This must be an interesting topic. Over 5000 views in this group and 100 views of the eLinux page. --Mark On Thursday, October 27, 2016 at 10:38:58 AM UTC-4, Jason Kridner wrote: > > > > On Oct 26, 2016, at 3:20 PM, William Hermans <yyr...@gmail.com > <javascript:>> wrote: > > HI Mark, > > So here: > http://elinux.org/EBC_Exercise_31_Dallas_1-Wire#Reading_the_DS12B20 > > Shouldn't > > The *t=24437* is the temperature in C times 1000. Warm up the probe and >> see what happens to the temp. >> >> > I believe this is stated properly, but could be confusing. > > Be: > > The *t=24437* is the temperature in C times .001. Warm up the probe and >> see what happens to the temp. >> > > ? > > > Perhaps you mean: > Given t=24437, you can determine the temperature in C by multiplying t by > .001. Warm up the probe and see what happens to the temp. > > You could also say by dividing by 1000. Mark's language was right because > he was describing how t is derived from the temperature and not the other > way around. > > > I do like your courses though. Really easy for someone like me , who has > yet had experience with one-wire devices. > > On Wed, Oct 26, 2016 at 7:23 AM, Mark A. Yoder <mark.a...@gmail.com > <javascript:>> wrote: > >> I've just posted[1] updated instructions on how to use Dallas 1-wire >> devices on the Bone. I'm running: >> bone$ *uname -a* >> Linux yoder-debian-bone 4.4.21-ti-r47 #1 SMP Fri Sep 23 22:23:02 UTC 2016 >> armv7l GNU/Linux >> bone$ *cat /ID.txt* >> BeagleBoard.org Debian Image 2016-08-28 >> >> The instructions show how to deconfigure P9_12 so the 1-wire driver can >> run on it. >> >> --Mark >> >> [1] http://elinux.org/EBC_Exercise_31_Dallas_1-Wire >> >> On Sunday, January 19, 2014 at 8:42:49 PM UTC-5, godsf...@gmail.com >> wrote: >>> >>> Can you post a photo of how you have them wired please? >>> >>> On Wednesday, December 4, 2013 8:51:26 AM UTC-5, Doug Edey wrote: >>>> >>>> I've got 3 DS18B20 sensors on my bus at the moment, providing you've >>>> got the sensors running in non-parasitic mode, I think you'll be fine. >>>> >>>> On Tuesday, December 3, 2013 8:13:31 PM UTC-5, lorena...@gmail.com >>>> wrote: >>>>> >>>>> Thinking of replacing the dedicated microcontroller that runs my house >>>>> with a BBB. Being able to read the existing 1-Wire network will be >>>>> critical. Currently have 12 18B20 sensors on one bus, need more. Can the >>>>> kernel module described here actually address and read multiple sensors >>>>> on >>>>> the same bus? Can it search and retrieve addresses from unknown sensors? >>>>> >>>>> I see people selling 8-port capes, as if maybe this is a simple one >>>>> device per bus routine... Wouldn't help me! >>>>> >>>>> As for the "considerations" of long buses, yes there was a learning >>>>> curve. I have both active pull-up and active pull-down, with careful >>>>> source-end termination. All cable is CAT-5, and all sensors are within 1m >>>>> of a single linear topology installation. In several cases the bus goes >>>>> out >>>>> one pair of the CAT-5 to a distant sensor and comes back on another pair >>>>> of >>>>> the same cable to continue to the next destination. Branching.in a star >>>>> fashion is death to 1-Wire. My current system works, reliably controlling >>>>> serious solar hot water and outdoor wood boiler operation that could blow >>>>> off expensive antifreeze fluid (a huge hassle to recharge) if anything >>>>> overheated. >>>>> >>>>> Great long-bus reference: >>>>> http://www.1wire.org/Files/Articles/1-Wire-Design%20Guide%20v1.0.pdf >>>>> >>>> -- >> For more options, visit http://beagleboard.org/discuss >> --- >> You received this message because you are subscribed to the Google Groups >> "BeagleBoard" group. >> To unsubscribe from this group and stop receiving emails from it, send an >> email to beagleboard...@googlegroups.com <javascript:>. >> To view this discussion on the web visit >> https://groups.google.com/d/msgid/beagleboard/6a937fdb-7316-48b0-8b84-543757958c8c%40googlegroups.com >> >> <https://groups.google.com/d/msgid/beagleboard/6a937fdb-7316-48b0-8b84-543757958c8c%40googlegroups.com?utm_medium=email&utm_source=footer> >> . >> For more options, visit https://groups.google.com/d/optout. >> > > -- > For more options, visit http://beagleboard.org/discuss > --- > You received this message because you are subscribed to the Google Groups > "BeagleBoard" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to beagleboard...@googlegroups.com <javascript:>. > To view this discussion on the web visit > https://groups.google.com/d/msgid/beagleboard/CALHSORoZHnv1PArG9zyCfV36esCb8T_%2BtJ-1zy7amx8TMOQocA%40mail.gmail.com > > <https://groups.google.com/d/msgid/beagleboard/CALHSORoZHnv1PArG9zyCfV36esCb8T_%2BtJ-1zy7amx8TMOQocA%40mail.gmail.com?utm_medium=email&utm_source=footer> > . > For more options, visit https://groups.google.com/d/optout. > > -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups "BeagleBoard" group. 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