Hi Phil, On 06/18/2012 02:08 PM, Phil White wrote:
> Hello Elroy, > > Thanks for the reply. > > On 16 June 2012 21:27, Eloy Paris<[email protected]> wrote: >> <... snip ...> >> but after seeing your >> comment that my statement above is incorrect, I read the datasheets... > > Oh! Please don't interpret my comment as a statement that you are wrong! Haha. Don't worry about it -- I can be wrong! Didn't mean to imply that I am infallible; nobody is, actually ;-) > It was simply referencing what I understood. As can be deduced from > the preceeding posts, I know *** *** (absolutely nothing) about this - I know just enough to be dangerous but I've spent sometime getting myself familiar with the 1-Wire protocol since I created a microcontroller-based 1-Wire slave that I am using in production around my house, and coexisting with DS18B20s. > I just have to rely on Dallas datasheets, which aren't very clear. The > other problem I am noticing more and more is that URLs for datasheets > etc. give a 404 error, so there is less info available. Yup, the datasheets aren't very clear in some cases. I like the 1-Wire flowcharts and 1-Wire timing diagrams in the datasheets, but the datasheet that says that the presence pulse is "guaranteed on contact" is a bit confusing for sure. >>> this would suggest I cannot mix an i-button lock on the same bus as my >>> temperature sensors. >> >> Good point. If the slave cannot initiate communications then polling by >> the master is the only option, and you are right in that a reasonable >> polling frequency will be necessary so the user does not experience a >> boring waiting time. > > Good. Well, that's as good as a definite for me that a lock facility > should be on a separate circuit. However, a switch sensor, which I > only need to poll every minute, is quite feasible. Good luck with your project! Let us know how things go. Cheers, Eloy Paris.- ------------------------------------------------------------------------------ Live Security Virtual Conference Exclusive live event will cover all the ways today's security and threat landscape has changed and how IT managers can respond. Discussions will include endpoint security, mobile security and the latest in malware threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/ _______________________________________________ Owfs-developers mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/owfs-developers
