When this all works, I want pictures and a description for the website! On Saturday 09 April 2005 09:33 pm, Hans Parkmann wrote: > Hello owfs-users and developers, > > I just, registered to this mailing list. I am the one who had the > questions on "stepper driving with owfs", Paul was so kind to post them > here. > > I got my DS9490R from Dallas today and I got it running with owfs > (latest daily package) under gentoo. I can mount it as root and acces > the bus as user. > Note: It took some research how to pass the "-x" command to fusermount , > I use fuse 2.2 pre 3 and --fuse-opts"allow_other" did the trick for me, > there should be some advice in the faq that tells you how to pass the > option correctly according to the fuse version used. I run Gentoo Kernel > 2.6.10
Thanks. Was setting up owfs with Gentoo any difficulty? > > I plan to use the one wire bus mostly for environment control > (Terrarium) and as timer. > At the then the bus weight will be around 30m-40m with around 6-8 > sensors (Temperature, humidity, light) 6-7 relais, and one 12v stepper > motor. Is standard telephone cable still good enough for this cable > weight? Or should I go with cat5 cable ... its all in the cable > according to the dallas application notes ;) My reading says that bus reflections are the critical element -- a linear rather than branched topology is better. > > So far I only got the sensor readout working. I write my applications in > Gambas what is a kind of Virtual Basic (please dont throw stones on me), > its not C, but very easy to learn. The only programming experience I > have is qbasic to for me its a gigantic step forward. Gambas sounds good. Too bad swig doesn't support it. You'll have to use the filesystem interface, as opposed to direct calls within Gambas. > > The next step will be relais control, I will use DS2408 for this , > someone mentioned I should use logic 0 the switch instead of logic 1. > Why is it better this way? This is a little confusing. In OWFS, you use "1" to turn on a PIO (switch) which seems logical. What you are actually doing is making the pin conduct to ground, so the actual hardware command sends a "0" to the pin, and reading the logical value at that pin (sensed property) will be a "0" since the pin is at ground. > > I finally understood how an optokoppler works (my electronic knowledge > is still very basic, 3 innocent optokopplers went up in smoke but now I > know how they work), the relais are very simple : BC517, CNY17-2, LED, > Resistor, some diodes, I would connect everything this way : > > 1.PIO PIN goes LOW > 2.Optokoppler transistor switches > 3.Collector Emitter voltage connects to BC 517 Base Voltage > 4.BC 517 switches and power is going through the Relais > > This circuit was tested (without DS2408 just some wires and powersupply) > and I hope it will work, it will be tested tomorrow but if you think > anything should be done different please post it. > When the Relais run I will investigate the stepper control further... > > My final and most important question : > > On the DS9490R there are two Grounds : "1-wire GND / Return" and "power > ground" > I assume power ground is for the is the gnd for the +5V stolen from the > USB Port, so I wont need this. > But when I use an external power supply to power the sensors / IO chips, > do I have to connect 1-wire Ground even when i already have connected > the gnd pin of the chip to the GND of my power supply? > I mean when the ground wire from my power supply and 1-wire ground are > connected to the same pin could this harm my Adapter or USB Port? The > power Supply will power all Bus devices(5v), relais(5v) and 3 PC > Fans(12v) so I am afraid this could do damage to the port. > I'm a little lost. You can have two separate circuits: 1-wire with power, data and ground, and a separate power line with power and ground. You would have to keep them separate by using the relays. That's one advantage of the Cat5: more wires and bigger gauge. I can't think of a reason not to tie all the grounds together, unless you expect a lot of noise on the separate power line. > Thanks for all your help, this mailing list is really helping, without > it I would still sit here and wonder why I cant access my USB-dongle :) > > Thats all for now, please forgive my poor english I am german. > Simon > > > ------------------------------------------------------- > SF email is sponsored by - The IT Product Guide > Read honest & candid reviews on hundreds of IT Products from real users. > Discover which products truly live up to the hype. Start reading now. > http://ads.osdn.com/?ad_id=6595&alloc_id=14396&op=click > _______________________________________________ > Owfs-developers mailing list > Owfs-developers@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/owfs-developers ------------------------------------------------------- SF email is sponsored by - The IT Product Guide Read honest & candid reviews on hundreds of IT Products from real users. Discover which products truly live up to the hype. Start reading now. http://ads.osdn.com/?ad_id=6595&alloc_id=14396&op=click _______________________________________________ Owfs-developers mailing list Owfs-developers@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/owfs-developers
