On Thu, Oct 18, 2012 at 07:45:44PM +0200, Attila wrote: > If we are talking about cables - how you use UTP cable? Let me explain > > THere are 3 wires has to be used (or two in parasite mode- but in this case > it is not a question :) - what you use as a "stand alon" wire? > In my current installation I use a twisted pair for GND and Data, and use a > separate for VCC. I read the design document, but I cannot remember any > recommendation about the "orphan" wire... > > (I use GND and Data twistid by the following logic: Data has to be in the > twist, no question. VCC is optional, so I left it alone... > Another option was to use the VCC and GND together in twist (as they are > similar), but they do not generate noise as they are constant voltages - > not like data...)
I always used 4 conductors: data and gnd; vcc and gnd. I generally left the vcc's gnd unattached at the slave end to avoid loops (which can result in echos). I also recommend you look into using a higher voltage for power and down converting it at the sensor if your sensor is more than just a temp sensor. I strongly recommend the KIS-3r33 units which you can buy almost anywhere and can easily be modified in all sorts of interesting ways (e.g. http://njhurst.com/blog/01322309277). I use these for everything now, with a 20V supply from a $6 laptop replacement power supply. I even use them purely as power switches as they have logic level input and high current output. njh ------------------------------------------------------------------------------ Everyone hates slow websites. So do we. Make your web apps faster with AppDynamics Download AppDynamics Lite for free today: http://p.sf.net/sfu/appdyn_sfd2d_oct _______________________________________________ Owfs-developers mailing list Owfs-developers@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/owfs-developers
