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+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out.
