> On Oct 26, 2016, at 3:20 PM, William Hermans <[email protected]> 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 <[email protected]> >> 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, [email protected] 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, [email protected] 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 [email protected]. >> To view this discussion on the web visit >> https://groups.google.com/d/msgid/beagleboard/6a937fdb-7316-48b0-8b84-543757958c8c%40googlegroups.com. >> 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 [email protected]. > To view this discussion on the web visit > https://groups.google.com/d/msgid/beagleboard/CALHSORoZHnv1PArG9zyCfV36esCb8T_%2BtJ-1zy7amx8TMOQocA%40mail.gmail.com. > 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 [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/beagleboard/FC414112-5988-431D-9027-10E88088AE2F%40gmail.com. For more options, visit https://groups.google.com/d/optout.
