> Date: Tue, 31 May 2016 23:04:52 +0200
> From: Jan Kandziora <j...@gmx.de>

> That's okay, but keep in mind for later installations twisted pair is
> BAD for onewire. Twisted pair is only good if the drive is symetrical.
> For asymetrical drive as with onewire, it only adds cable length and
> capacity.

Wouldn't parasitic power onewire be symmetrical? Seems to work for me...  
 
I have probably 150 feet of CAT5 chained around my house. Sometimes out on one 
pair and back on another to continue the chain. At the far end of the chain, a 
1N5711 Schottky diode and a 1.5KE20A-T TVS reduced errors a bit. What really 
cut my errors to zero was adding a 0.02 uF capacitor across the start of the 
chain. It drastically slows the signal rise times, but doesn't seem to hurt 
readings. It completely stopped the seemingly random storms of errors that 
would appear for a few hours and then go away for days. Military radar? Spooks? 
 
But that is with an ancient dedicated microprocessor at 5V - not with owfs. It 
reads and sets up a different single DS18B20 of the ten connected, every ten 
seconds. Often goes for months without a single missed reading now. 

| Loren Amelang | lo...@pacific.net |




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