hummm nice =] try power them with 5v and check, i think it work :) 2011/2/5 patyrk <[email protected]>: > Dnia 2011-02-05, sob o godzinie 20:59 -0200, Roberto Spadim pisze: >> i don't know how alias work >> but you have a directory /uncached/xxxxxxxxxxxx/temperature and >> /xxxxxxxxxxxx/temperature >> you should use the cached version, not the uncached > > ok, that's right I'm using cached version, the alias could be misleading > so the commands look like this > > owread -s 2485 28.E4B5BF020000/temperature > > > But for Paul wrote, I understand that it won't work now in owfs if > sensors are parasite powered. > > > -- > p4trykx > > >> >> 2011/2/5 patyrk <[email protected]>: >> > Dnia 2011-02-05, sob o godzinie 11:23 -0500, Paul Alfille pisze: >> >> Yes, you need the cache to store the time markers. >> > >> > To Roberto: >> > Does owread -s 2485 patryk/temperature use the cache? >> > >> > >> >> If simultaneous works in passive mode, I'll make the change. >> > I think with all parasite XOR powered it will work. But I'm not certain >> > what happens with mixed configuration. >> > Specs says this >> > If the DS18B20 is powered by an >> > external supply, the master can issue read time slots after the Convert >> > T command and the DS18B20 will >> > respond by transmitting a 0 while the temperature conversion is in >> > progress and a 1 when the conversion >> > is done. In parasite power mode this notification technique cannot be >> > used since the bus is pulled high by >> > the strong pullup during the conversion. >> > >> > Is this "read time slots" optional? >> > >> > -- >> > P4trykx >> > >> > >> > >> > >> > >> > >> > >> > >> >> >> >> On Sat, Feb 5, 2011 at 10:54 AM, Roberto Spadim <[email protected]> >> >> wrote: >> >> > maybe it works with cached version, not uncached >> >> > >> >> > 2011/2/5 patyrk <[email protected]>: >> >> >> Hello >> >> >> Fist, sorry for double messages. My e-mail client went nuts. >> >> >> >> >> >> I previously said that simultaneous temp. conversion is not possible >> >> >> with parasite power. Well, I was wrong. This mail is to sum up all that >> >> >> wrote before. >> >> >> >> >> >> The specs of ds18b20 aren't very clear about it. However there is a >> >> >> command skip rom mentioned on page 11 >> >> >> >> >> >> SKIP ROM [CCh] >> >> >> The master can use this command to address all devices on the bus >> >> >> simultaneously without sending out >> >> >> any ROM code information. For example, the master can make all DS18B20s >> >> >> on the bus perform >> >> >> simultaneous temperature conversions by issuing a Skip ROM command >> >> >> followed by a Convert T [44h] >> >> >> command. >> >> >> >> >> >> Moreover I asked about this simultaneous conversion on some Polish uC >> >> >> board and 2 users replied that they use this feature and it works even >> >> >> with parasite power. So I thinks it would be nice to have this feature >> >> >> working in owfs because its very useful with many ds1820. >> >> >> >> >> >> I've found some messages form 2006 and 2008 on this list that say >> >> >> simultaneous is working. But it seems not to work in my case. I use >> >> >> ds2480b master connected to serial port and few ds18b20 and 2 ds18s20. >> >> >> >> >> >> Maybe I'm using it wrong. This is my script >> >> >> #!/bin/sh >> >> >> owwrite -s 2485 /simultaneous/temperature "1" >> >> >> >> >> >> temp="temperature" >> >> >> owread -s 2485 patryk/"$temp" >> >> >> owread -s 2485 pokoj/"$temp" >> >> >> owread -s 2485 pokoj_grzejnik/"$temp" >> >> >> owread -s 2485 korytarz/"$temp" >> >> >> owread -s 2485 korytarz_grzejnik/"$temp" >> >> >> owread -s 2485 tata/"$temp" >> >> >> owread -s 2485 dziadek/"$temp" >> >> >> owread -s 2485 zielony/"$temp" >> >> >> >> >> >> echo "koniec" >> >> >> >> >> >> >> >> >> It takes about 10 seconds no matter if I use simultaneous. >> >> >> owwrite takie about 0.02 seconds that's to short. >> >> >> >> >> >> >> >> >> -- >> >> >> p4trykx >> >> >> >> >> >> >> >> >> >> >> >> >> >> >> >> >> >> ------------------------------------------------------------------------------ >> >> >> The modern datacenter depends on network connectivity to access >> >> >> resources >> >> >> and provide services. The best practices for maximizing a physical >> >> >> server's >> >> >> connectivity to a physical network are well understood - see how these >> >> >> rules translate into the virtual world? >> >> >> http://p.sf.net/sfu/oracle-sfdevnlfb >> >> >> _______________________________________________ >> >> >> Owfs-developers mailing list >> >> >> [email protected] >> >> >> https://lists.sourceforge.net/lists/listinfo/owfs-developers >> >> >> >> >> >> >> >> > >> >> > >> >> > >> >> > -- >> >> > Roberto Spadim >> >> > Spadim Technology / SPAEmpresarial >> >> > >> >> > ------------------------------------------------------------------------------ >> >> > The modern datacenter depends on network connectivity to access >> >> > resources >> >> > and provide services. The best practices for maximizing a physical >> >> > server's >> >> > connectivity to a physical network are well understood - see how these >> >> > rules translate into the virtual world? >> >> > http://p.sf.net/sfu/oracle-sfdevnlfb >> >> > _______________________________________________ >> >> > Owfs-developers mailing list >> >> > [email protected] >> >> > https://lists.sourceforge.net/lists/listinfo/owfs-developers >> >> > >> >> >> >> ------------------------------------------------------------------------------ >> >> The modern datacenter depends on network connectivity to access resources >> >> and provide services. The best practices for maximizing a physical >> >> server's >> >> connectivity to a physical network are well understood - see how these >> >> rules translate into the virtual world? >> >> http://p.sf.net/sfu/oracle-sfdevnlfb >> >> _______________________________________________ >> >> Owfs-developers mailing list >> >> [email protected] >> >> https://lists.sourceforge.net/lists/listinfo/owfs-developers >> > >> > >> > >> > ------------------------------------------------------------------------------ >> > The modern datacenter depends on network connectivity to access resources >> > and provide services. The best practices for maximizing a physical server's >> > connectivity to a physical network are well understood - see how these >> > rules translate into the virtual world? >> > http://p.sf.net/sfu/oracle-sfdevnlfb >> > _______________________________________________ >> > Owfs-developers mailing list >> > [email protected] >> > https://lists.sourceforge.net/lists/listinfo/owfs-developers >> > >> > >> >> >> > > > > ------------------------------------------------------------------------------ > The modern datacenter depends on network connectivity to access resources > and provide services. The best practices for maximizing a physical server's > connectivity to a physical network are well understood - see how these > rules translate into the virtual world? > http://p.sf.net/sfu/oracle-sfdevnlfb > _______________________________________________ > Owfs-developers mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/owfs-developers > >
-- Roberto Spadim Spadim Technology / SPAEmpresarial ------------------------------------------------------------------------------ The modern datacenter depends on network connectivity to access resources and provide services. The best practices for maximizing a physical server's connectivity to a physical network are well understood - see how these rules translate into the virtual world? http://p.sf.net/sfu/oracle-sfdevnlfb _______________________________________________ Owfs-developers mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/owfs-developers
