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Re: A Request - 1 Wire Network

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Posted by Phil on Wednesday, 26 May 2010, at 11:03 a.m.,
in response to Re: A Request - 1 Wire Network, posted by stuart

It's UN-usual for the 1-wire bus to come and go for purely electrical reasons.

Sure, if the bus runs past a realy noisy electrical device (like a motor or lamp ballast) it could drop out when that device turns on, but in MOST cases noisy sensors turn out to be either bad electrical connections or moisture inside sensors.

Outside sensors are notorious for both of these. The other problem is that outside sensors also go thorough the greatest thermal changes, so wires expand and contract on a daily basis, plus they can also be prone to vibration from wind etc.

I'd check all of the connections on that leg of the bus. Re-tighten screw connections, tug on crimps to make sure thay are solid and check your sensor placements for water problems. Provide slack for any tight cable runs. If possible when you see the sensor drop out, take a voltage measurement at the end of that bus leg. Look to see if the +5V is present or not.

Phil.

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