Re: [Owfs-developers] DS2482-800 long wire problem
Am 02.01.2015 um 16:08 schrieb Jan Sennesael: > Everything was running fine, but when i tried to add a couple of sensors i > run into some troubles: Since these sensors are on the other side of the > house, is added a long utp cat5e cable (long= 25m a 30m) > Don't use a pair for 1W and GND, as the tight coupling adds a lot of capacity to the bus, and capacity is limiting the cable length in onewire. If you cannot avoid this particular cable, use one pair for 1W and another one for GND. No ethernet allowed in the same mantle! > > Since the cabling is ok i am guessing the total cable length is to long. > No. Maybe for this type of cable, but definately not for some simple telephone wires. Kind regards Jan -- Dive into the World of Parallel Programming! The Go Parallel Website, sponsored by Intel and developed in partnership with Slashdot Media, is your hub for all things parallel software development, from weekly thought leadership blogs to news, videos, case studies, tutorials and more. Take a look and join the conversation now. http://goparallel.sourceforge.net ___ Owfs-developers mailing list Owfs-developers@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/owfs-developers
Re: [Owfs-developers] DS2482-800 long wire problem
Have you tried another channel on the DS2482-800 for the long run? The 8 channels are electrically separate. I assume you've looked at some of the resources for 1-wire bus topology, like http://www.maximintegrated.com/en/app-notes/index.mvp/id/148 Paul On Fri, Jan 2, 2015 at 10:08 AM, Jan Sennesael wrote: > I have a plugin board running on top of my pi containing a DS2482-800 and > an > 2482-100 master. Both are connected through I2C. > The DS18b20's that are connected are connected in bus layout and are > powered > (not parasite) > Everything was running fine, but when i tried to add a couple of sensors i > run into some troubles: Since these sensors are on the other side of the > house, is added a long utp cat5e cable (long= 25m a 30m) to the first > sensor. However, if i connect the sensor the whole channel of the > DS2482-800 > stops working. If i disconnect it, the rest works again. > I guess that there is already around 30m active. (so the total distance > between the master and the new sensor is around 60m > > Since the cabling is ok i am guessing the total cable length is to long. > Is there anything to solve this problem? (pull up resistor or cap?) Would > the 2482-100 be better at this? I didn't use it since this one draws power > from the pi and the -800 is externally powered (board layout issue...) > > Thanks > Jan > > > > -- > Dive into the World of Parallel Programming! The Go Parallel Website, > sponsored by Intel and developed in partnership with Slashdot Media, is > your > hub for all things parallel software development, from weekly thought > leadership blogs to news, videos, case studies, tutorials and more. Take a > look and join the conversation now. http://goparallel.sourceforge.net > ___ > Owfs-developers mailing list > Owfs-developers@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/owfs-developers > -- Dive into the World of Parallel Programming! The Go Parallel Website, sponsored by Intel and developed in partnership with Slashdot Media, is your hub for all things parallel software development, from weekly thought leadership blogs to news, videos, case studies, tutorials and more. Take a look and join the conversation now. http://goparallel.sourceforge.net___ Owfs-developers mailing list Owfs-developers@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/owfs-developers
[Owfs-developers] DS2482-800 long wire problem
I have a plugin board running on top of my pi containing a DS2482-800 and an 2482-100 master. Both are connected through I2C. The DS18b20's that are connected are connected in bus layout and are powered (not parasite) Everything was running fine, but when i tried to add a couple of sensors i run into some troubles: Since these sensors are on the other side of the house, is added a long utp cat5e cable (long= 25m a 30m) to the first sensor. However, if i connect the sensor the whole channel of the DS2482-800 stops working. If i disconnect it, the rest works again. I guess that there is already around 30m active. (so the total distance between the master and the new sensor is around 60m Since the cabling is ok i am guessing the total cable length is to long. Is there anything to solve this problem? (pull up resistor or cap?) Would the 2482-100 be better at this? I didn't use it since this one draws power from the pi and the -800 is externally powered (board layout issue...) Thanks Jan -- Dive into the World of Parallel Programming! The Go Parallel Website, sponsored by Intel and developed in partnership with Slashdot Media, is your hub for all things parallel software development, from weekly thought leadership blogs to news, videos, case studies, tutorials and more. Take a look and join the conversation now. http://goparallel.sourceforge.net ___ Owfs-developers mailing list Owfs-developers@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/owfs-developers
