On 3/3/07, Jan Kandziora <[EMAIL PROTECTED]> wrote: > Am Samstag, 3. März 2007 21:14 schrieb Pedro Côrte-Real: > > Do I need to power the 18B20 with Vcc for this distance? > > > No. Power requirement of the DS18B20 is max. 1.5mA, which causes only a > voltage drop in the mV range even on long and thin 1W and GND lines. > > Check for contact problems at the connectors.
Yep, turned out to be that. > > In general what should I look out for in distances over 10 meters? > > > If you power a lot of onewire chips (and peripheals) over a thin, long cable, > the GND niveau at the end of the cable may reach 0.7V due to the current > through it. This disturbs the onewire function for chips at the end of the > cable a lot. Any idea what the usable range will be using Cat6? Pedro. ------------------------------------------------------------------------- Take Surveys. Earn Cash. Influence the Future of IT Join SourceForge.net's Techsay panel and you'll get the chance to share your opinions on IT & business topics through brief surveys-and earn cash http://www.techsay.com/default.php?page=join.php&p=sourceforge&CID=DEVDEV _______________________________________________ Owfs-developers mailing list Owfs-developers@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/owfs-developers
