i think owhttp have a bug in setting values (any one) i don´t know if the newest version have this problem, please check, if its ok tell us, if not tell us too =)
Em 26 de março de 2012 18:25, Ivan Lisenkov <[email protected]> escreveu: > Thank you for your answers! > > The problem with selective search is that I don't know if the device is > still on a bus or not, so polling on ordinary search is more reliable for > hardware failure detection. Second, alarm is set for sensed values, not for > latches, so it is possible to miss some very short event. > > I know, 1-wire is not the fastest network on the Earth, but I'm trying my > best :) > > PS. > > It seems it is not possible to set negative alarm values for DS18B20 > temperature sensors. Or it is a bug in owhttp interface? > > > Best Regards, > > Ivan, PhD > > > > > > On Tue, Mar 27, 2012 at 12:13 AM, Serg Oskin <[email protected]> wrote: >> >> Try to use the alarm-directory. >> >> # Setup >> foreach 12.* >> openeach >> writevalue_to_set_alarm >> closeeach >> end foreach >> >> # Main loop >> foreach uncached/alarm >> openeach >> readvalue >> reset_alarm >> closeeach >> end loop >> >> -- >> Serg. >> >> > Greetings to all, >> > >> > I am implementing a system which need to poll sensors (mainly DS2406 and >> > DS2408) nearly every second. Of course I use uncached values of sensors to >> > get the most recent data. I have about 15-20 sensors to poll. >> > >> > I see three options: >> > >> > First: >> > loop: >> > openfile("12.XXXXXXXX/latch.A"); >> > readvalue; >> > closefile; >> > end loop. >> > >> > The most obvious one, but open/close file is rather costly operation. >> > >> > Second: >> > openfile("12.XXXXXXXX/latch.A"); >> > loop: >> > readvalue; >> > goto_first_line; >> > end loop; >> > closefile; >> > >> > This is better, but is there some chance, that value will be cached >> > somewhere inside OS? >> > >> > Third: >> > give up on owfs and use owhttpd and make tcp connections to read files. >> > >> > I think this is a heaviest one, but crossplatform, so can be used on >> > windows. Can owhttpd have about 20 concurrent connections in a second? >> > >> > >> > What strategy to choose? Thank you for any help in advance. >> > >> > >> > Best Regards, >> > >> > Ivan, PhD >> > >> > >> > >> > >> > >> > ------------------------------------------------------------------------------ >> > This SF email is sponsosred by: >> > Try Windows Azure free for 90 days Click Here >> > http://p.sf.net/sfu/sfd2d-msazure >> > >> > >> > >> > _______________________________________________ >> > Owfs-developers mailing list >> > [email protected] >> > https://lists.sourceforge.net/lists/listinfo/owfs-developers >> >> >> ------------------------------------------------------------------------------ >> This SF email is sponsosred by: >> Try Windows Azure free for 90 days Click Here >> http://p.sf.net/sfu/sfd2d-msazure >> _______________________________________________ >> Owfs-developers mailing list >> [email protected] >> https://lists.sourceforge.net/lists/listinfo/owfs-developers > > > > ------------------------------------------------------------------------------ > This SF email is sponsosred by: > Try Windows Azure free for 90 days Click Here > http://p.sf.net/sfu/sfd2d-msazure > _______________________________________________ > Owfs-developers mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/owfs-developers > -- Roberto Spadim Spadim Technology / SPAEmpresarial ------------------------------------------------------------------------------ This SF email is sponsosred by: Try Windows Azure free for 90 days Click Here http://p.sf.net/sfu/sfd2d-msazure _______________________________________________ Owfs-developers mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/owfs-developers
