spou wrote:
I'm surprised you need a special hardware bridge. The regular 1wire-to-rs232 ( DS9097U ) or 1wire-to-USB ( DS9490 ) should be enough for most needs.
I personally run a good 300 feet, 12 DS1820 drops network over CAT3 cable going into a DS9097U without problems. For me, the real problem is getting the 1wire data into cumulus. This looks like a software problem more than anything else, specially when counters are in the equation (for rain and wind speed)
Or maybe I'm wrong and where is indeed a need for a hardware interface, there are things I dont know
Can you explain more, there might be something I can learn here.
Spou
It has nothing to do with range. 1-wire is purely a transport protocol, and so it dumps data in a variety of formats with no standard or even self consistent meanings. The problem is not one of simple physical interface - that's fairly trivial, if you ignore error detection (sometimes CRC-8, sometimes CRC-16) and addressing issues (every device is unique, so manual intervention is usually required). The problem is to interpret and process the data, and then present it to Cumulus is a fashion similar to the way commercial stations do. The whole 1-wire job is huge, and I suspect is the main reason Steve is not keen to support it directly. There are as many flavors of hardware as there are of weather.
My approach is to offload all of this into a custom processing unit, supporting a small family of common sensors, and emulate a standard station to Cumulus.
A bit more than a "bridge".
Having said that, people like 1-wire because it's simple and robust and sensors can be quite accurate with extremely rare erroneous data. Most of us that like to fiddle with hardware, also like the power of Cumulus for data manipulation and presentation, and there's the usual rub.
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