From: Paulsen, B. <BPa...@le...> - 2001-01-08 16:26:40
|
It's the line length that's the problem, not the number of chips. Before I wired in the 100-ohm resistor, I had troubles with just two chips on the line. Brian > -----Original Message----- > From: Jerry Shenk [SMTP:ja...@de...] > Sent: Monday, January 08, 2001 11:12 AM > To: mis...@li... > Subject: Re: [misterhouse-users] 1-wire 'hub' (DS2409) > > So, 20 chips doesn't get into the issue of wiring being a > problem.....basically hook 'em up any way you want for that size? > > ----- Original Message ----- > From: "Paulsen, Brian" <BPa...@le...> > To: <mis...@li...> > Sent: Monday, January 08, 2001 11:00 AM > Subject: RE: [misterhouse-users] 1-wire 'hub' (DS2409) > > > > I have 6 and I'm planning to add the Weather Station plus rain gauge and > I > > also have 2 more temperature sensors that I'm planning to hook up. > > > > When I get finished, I'll probably have around 20 chips on the line. > > > > Brian > > > > > -----Original Message----- > > > From: Jerry Shenk [SMTP:ja...@de...] > > > Sent: Monday, January 08, 2001 10:46 AM > > > To: mis...@li... > > > Subject: Re: [misterhouse-users] 1-wire 'hub' (DS2409) > > > > > > How many do you have? I can see reasons to put in about 2 or 3 but > you > > > know > > > how that goes....pretty soon I'll be wanting to measure the > temperature > in > > > the roof at various places to determine the adequacy of the > insulation;) > > > > > > ----- Original Message ----- > > > From: "Paulsen, Brian" <BPa...@le...> > > > To: <mis...@li...> > > > Sent: Monday, January 08, 2001 10:24 AM > > > Subject: RE: [misterhouse-users] 1-wire 'hub' (DS2409) > > > > > > > > > > I have some of mine in series and others in parallel. Dallas > recommends > > > > using the DS2409 chip if you are going to wire in parallel, but I > think > > > that > > > > that recommendation may only apply to extremely large networks. > > > > > > > > Brian > > > > > > > > > -----Original Message----- > > > > > From: Jerry Shenk [SMTP:ja...@de...] > > > > > Sent: Monday, January 08, 2001 10:16 AM > > > > > To: mis...@li... > > > > > Subject: Re: [misterhouse-users] 1-wire 'hub' (DS2409) > > > > > > > > > > That is so helpful!! Thanks. I've been planning do work on the > > > 1-wire > > > > > temp > > > > > sensor for nearly a year. This looks pretty simple. > > > > > > > > > > I've got one question - the 2nd iButton....is it just wired in > > > parallel > > > to > > > > > the first one? > > > > > > > > > > ----- Original Message ----- > > > > > From: "Ray Dzek" <rd...@so...> > > > > > To: <mis...@li...> > > > > > Sent: Saturday, January 06, 2001 3:06 AM > > > > > Subject: RE: [misterhouse-users] 1-wire 'hub' (DS2409) > > > > > > > > > > > > > > > > I wondered too. I spent several days wandering around the > > > iButton.com > > > > > > site and reading posts here as well. I finally got up the nerve > to > > > > > order > > > > > > some things and see if it would work. I think 1-wire is so cool > I > > > want > > > > > > everybody to jump on the wagon, so I wrote a little HTML > tutorial > on > > > how > > > > > > to hook up a temperature button. You can find it at > > > > > > http://www.solarbugs.com/home/ibutton.htm I hope it helps. > > > > > > > > > > > > From: er...@pe... (Eric Vitiello) > > > > > > > > > > > > > I've been wanting to get into the 1wire ibuttons, but don't > know > > > where > > > > > to > > > > > > > start. I'd like to have a few temperature sensors around the > > > house. > > > > > What > > > > > > > parts would you all suggest buying to accomplish this task? > > > > > > > > > > > > > > --Eric > > > > > > > > > > > > > > > I read the application notes that Dallas Semiconductor wrote > > > about > > > > > star > > > > > > > > configurations (I believe it's application note #132) and > the > > > other > > > > > > > > piece of advice that it had was to put a 100-ohm resistor on > the > > > > > line. > > > > > > > > I had troubles with ringing and they cleared up remarkably > well > > > once > > > > > I > > > > > > > > added that resistor. Given that you can buy a pack of 5 > > > resistors > > > > > for > > > > > > > > 40 cents from Radio Shack, I would recommend trying that > > > solution > > > > > first > > > > > > > > before trying the 2409's. > > > > > > > > > > > > > > > > I currently have 6 temperature sensors throughout the house > in > a > > > > > star > > > > > > > > configuration and I plan to add the weather station and a > few > > > more > > > > > > > > temperature sensors this weekend. I'll let you know how it > > > goes. > > > > > > > > > > > > > > > > Brian > > > > > > > > > > > > > > > > > -----Original Message----- > > > > > > > > > From: Clay Jackson [SMTP:cl...@nw...] > > > > > > > > > Sent: Friday, January 05, 2001 1:56 PM > > > > > > > > > To: mis...@li... > > > > > > > > > Subject: [misterhouse-users] 1-wire 'hub' (DS2409) > > > > > > > > > > > > > > > > > > On another list I'm on (we...@da...), there are a > > > couple > > > > > > > > > threads that might be interesting to folks here, on 1-wire > > > > > networking > > > > > > > > > and using the DS2409 as a 'hub' for larger 1-wire > networks. > > > > > > > > > > > > > > > > > > The specs on 1-wire from Dallas basically say that they > expect > > > the > > > > > > > > > 1-wire 'microlan' to be a 'bus' configuration, much like > > > ethernet. > > > > > > > > > So, if you want to have a 'star' (in my case, I want to > > > measure > > > > > temps > > > > > > > > > in three different areas, about 3-4 temps in each area), > you > > > > > really > > > > > > > > > need to use the DS2049 'coupler' at the 'center' of each > star. > > > > > > > > > Otherwise, you'll run into problems with bus timing, > ringing > > > and > > > > > all > > > > > > > > > sorts of other nasty low-level issues. > > > > > > > > > > > > > > > > > > The GOOD news is that 2409s are relatively cheap (I think > > > they're > > > > > > > > > under $2 ea in small quantities). The BAD news is that > > > they're > > > > > only > > > > > > > > > available in a Surface Mount Package, which makes it > somewhat > > > > > > > > > difficult for the 'average' hobbiest (like me) to cobble > > > together > > > > > a > > > > > > > > > reasonable (size, reliability) 'hub'. > > > > > > > > > > > > > > > > > > But, some of the folks on the other list have come up with > a > > > > > circuit > > > > > > > > > board layout that would make dealing with the 2409 easier. > It > > > > > looks > > > > > > > > > like we might be able to put together a small quantity of > > > these > > > > > (say > > > > > > > > > 20-30) for between $5 and $10 per board. > > > > > > > > > > > > > > > > > > There are some software issues as well, but the Dallas > > > software > > > > > > > > > (including their Java stuff) will deal with the 2409s and > more > > > > > complex > > > > > > > > > networks, so that's the easy part. > > > > > > > > > > > > > > > > > > Anyone here who's interested should check out the other > list > > > (I > > > > > think > > > > > > > > > it's archived somewhere at Dallas); and let me know if you > > > might > > > > > be > > > > > > > > > interested in a board or three if we can put an order > > > together. > > > > > > > > > > > > > > > > > > Clay Jackson > > > > > > > > > cl...@nw... > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > ________________________________________________________ > > > > > > > > > To unsubscribe from this list, go to: > > > > > > > > > http://sourceforge.net/mail/?group_id=1365 > > > > > > > > > > > > > > > > ________________________________________________________ > > > > > > > > To unsubscribe from this list, go to: > > > > > > > > http://sourceforge.net/mail/?group_id=1365 > > > > > > > > > > > > > > > > > > > > > > > > > > > > > ________________________________________________________ > > > > > > > To unsubscribe from this list, go to: > > > > > > > http://sourceforge.net/mail/?group_id=1365 > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > Ray Dzek > > > > > > --- <Insert Silly Signature Graphics Here> --- > > > > > > > > > > > > > > > > > > > > > > > > ________________________________________________________ > > > > > > To unsubscribe from this list, go to: > > > > > http://sourceforge.net/mail/?group_id=1365 > > > > > > > > > > > > > > > > > > > > > ________________________________________________________ > > > > > To unsubscribe from this list, go to: > > > > > http://sourceforge.net/mail/?group_id=1365 > > > > > > > > ________________________________________________________ > > > > To unsubscribe from this list, go to: > > > http://sourceforge.net/mail/?group_id=1365 > > > > > > > > > > > > > ________________________________________________________ > > > To unsubscribe from this list, go to: > > > http://sourceforge.net/mail/?group_id=1365 > > > > ________________________________________________________ > > To unsubscribe from this list, go to: > http://sourceforge.net/mail/?group_id=1365 > > > > > ________________________________________________________ > To unsubscribe from this list, go to: > http://sourceforge.net/mail/?group_id=1365 |