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 >> >
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