Ok, found the problem! The temperature value is cached, in the units last requested. Clearly a bug.
Probably owserver should cache only in Centigrade and convert when transmitted. Paul (Not yet fixed, however). > On Wednesday 11 May 2005 09:32 pm, Kim Toms wrote: > > I am running an owserver process on SUSE linux 9.2 using a USB interface > > (DS9490) > > > > I am talking to a DS1921G thermocron (bought the development kit from > > Dallas). > > > > I was looking at the temperature using owhttpd (with -F). E.g, I'd look > > at http://localhost:8002/21.CE8E14000000/temperature and the value would > > be something like 77 degrees. > > I was writing a perl script to collect the same data and so I have the > > following in the script: > > > > #!/usr/bin/perl -I/opt/owfs/bin/ > > > > use OW; > > > > my $o = OW::init("localhost:8001"); > > > > my $x = OW::get("/21.CE8E14000000/temperature"); > > > > print $x; > > > > The value I got was around 25. Hm, I thought, perhaps a problem with no > > fahrenheit switch, so I did the conversion with a calculator, and it was > > a little off of what the owhttpd was reporting. So, I reloaded the page > > in the browser (mozilla/firefox). I was surprised to see that the browser > > now reports the temperature in centigrade as well. > > > > I am unsure if there is a way to pass arguments to OW::init to make it > > read in fahrenheight. > > > > A second question is how can I enumerate the devices available from the > > perl script, so that I can collect all of the termperatures there are? - > > wait I figured that out. Here's a way to get all the devices which have a > > 'temperature' entry in them: > > #!/usr/bin/perl -I/opt/owfs/bin/ > > > > use OW; > > my $o = OW::init("localhost:8001"); > > my @directories = split(/,/, OW::get("/")); > > $#directories -= 2; # remove 'alarm/' and 'simultaneous/' > > @temps = map($_ . ":" . OW::get($_."temperature"), > > @directories); # Get temperatures > > @temps = grep(!/:$/, @temps); # Remove non-temperature devices > > > > print join("\n", @temps), "\n"; > > ------------------------------------------------------- > This SF.Net email is sponsored by Oracle Space Sweepstakes > Want to be the first software developer in space? > Enter now for the Oracle Space Sweepstakes! > http://ads.osdn.com/?ad_id=7393&alloc_id=16281&op=click > _______________________________________________ > Owfs-developers mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/owfs-developers ------------------------------------------------------- This SF.Net email is sponsored by Oracle Space Sweepstakes Want to be the first software developer in space? Enter now for the Oracle Space Sweepstakes! http://ads.osdn.com/?ad_id=7393&alloc_id=16281&op=click _______________________________________________ Owfs-developers mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/owfs-developers
