On Thu, Apr 28, 2011 at 12:17 PM, Paul Davis <[email protected]> wrote: > Greg- > > I'm not completely clear on your placement of the reed switch. It seems as if > you are using the reed switch to connect/disconnect the DS2423 from the > 1-wire bus. Is that correct? Or is the 'no device' unintended? > > The only usage I've seen to date is with the DS2423 left on the bus and the > reed switch used to toggle the counter inputs. By the way, the counter inputs > have about a 28M ohm internal pull-up, so there should be an external pull-up > on them. > > Paul > > On Apr 27, 2011, at 11:40 PM, Gregg Levine wrote: > >> Hello! >> Question time again: >> Can anyone explain why the DS2423 counts when its input channels are >> disconnected? Using a magnetic switch I've accomplished the usual >> example application. Well its running on either a VM of Windows98SE >> and the original manager program for DS devices. And as it happens I'd >> start it going, and with the magnet in place. I'd move the magnet away >> and it would complain no device. But when the magnet is returned to >> the switch I would see an advance in the chosen counter. >> >> Of course the version Four drivers viewer doesn't indicate any change >> between steps regarding the switch. >> >> Despite the fact that these "DS2423 4kbit 1-Wire RAM with Counter" >> devices were discontinued by the firm and the datasheet even indicates >> that it is not recommended for new designs, I am working towards >> completing a design that was originally studied some time earlier. >> (The reason why I bought the chip that is. Bought because at the time >> the firm was DS not Maxim and samples were not part of the company's >> method of doing things, then.) >> ----- >> Gregg C Levine [email protected] >> "This signature fought the Time Wars, time and again."
Hello! Basically folks you have the right inference. I am using the reed switches as the data sheet suggested, but without those pull up resistor attached. Nathan this is a DS2423 and is supposed to behave in a manner described somewhere in the data sheet, but you've got the right idea. Paul I believe I am seeing the effects of not adding a pull up resistor. I shall add one of an appropriate rating somewhere around >1M Ohms. range and repeat these studies. Thank you gentlemen for your good advice. ----- Gregg C Levine [email protected] "This signature fought the Time Wars, time and again." ------------------------------------------------------------------------------ WhatsUp Gold - Download Free Network Management Software The most intuitive, comprehensive, and cost-effective network management toolset available today. Delivers lowest initial acquisition cost and overall TCO of any competing solution. http://p.sf.net/sfu/whatsupgold-sd _______________________________________________ Owfs-developers mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/owfs-developers
