Hello! A completely strange thought crossed my mind, what about building it from source? ----- Gregg C Levine gregg.drw...@gmail.com "This signature fought the Time Wars, time and again."
On Tue, Nov 1, 2016 at 2:11 PM, Jan Kandziora <j...@gmx.de> wrote: > Am 01.11.2016 um 16:10 schrieb Markus Gaugusch: >> >> 1.) Which value should the pull-up resistor have? I found a posting from >> Jan that 4k7 is wrong, although this value can be found everywhere. >> > The slave chips can sink 4mA. This means at 3.3V, the pullup can go down > as low as 825Ω without damaging the chips. I recommend using 1.5kΩ. > > A smaller pullup means working against the capacity of long cables to > achieve a fast raise time. Second, any pullup delivering more than a > continous 1mA allows you to forget about the "strong pullup" needed > otherwise for the DS1820 and other power-hungry chips. > > The 4.7kΩ pullup replicated again and again without thinking gives you > 700µA at 3.3V only, which leads to slower raise-times and will not > suffice powering a DS1820 during temperature conversion. > > >> Which pull-up should I use? And do I need pullup=1 for the w1 dtoverlay? >> > You don't need the active pullup when you use the 1.5kΩ pullup. > > >> >> 2.) The pull up resistor is connected to 3V3, correct? >> > Sure. You have a 3.3V GPIO output, so you have to pullup to 3.3V. If you > pullup to 5V, you fry the GPIO. > > >> 3.) Regarding owfs I found the last posting from Jan from 2016-10-29 which >> should get me up and running quickly :) >> > Remember you need owfs-3.1p1 for using --w1 on linux-3.16rc1 or later. > > Kind regards > > Jan > > > > ------------------------------------------------------------------------------ > Developer Access Program for Intel Xeon Phi Processors > Access to Intel Xeon Phi processor-based developer platforms. > With one year of Intel Parallel Studio XE. > Training and support from Colfax. > Order your platform today. http://sdm.link/xeonphi > _______________________________________________ > Owfs-developers mailing list > Owfs-developers@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/owfs-developers ------------------------------------------------------------------------------ Developer Access Program for Intel Xeon Phi Processors Access to Intel Xeon Phi processor-based developer platforms. With one year of Intel Parallel Studio XE. Training and support from Colfax. Order your platform today. http://sdm.link/xeonphi _______________________________________________ Owfs-developers mailing list Owfs-developers@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/owfs-developers
