Post by thread:one pin communication

Hello all, I need know the best way to communicate with one pin between more than 5 Pic's "like a little network" in a very noise environment. Or must I make that in RS485 ? How is the princip of the one pin communication with one Master and many Slaves ? Thank You spam_OUTmop18932TakeThisOuTmail.telepac.pt

Fernando Santos wrote: > I need know the best way to communicate with one pin between more > than 5 Pic's [...] I don't know about the best way, but having just figured out the Dallas one-wire protocol, I'd probably see if I could use that. -- James Cameron (.....cameronKILLspam@spam@stl.dec.com) OpenVMS, Linux, Firewalls, Software Engineering, CGI, HTTP, X, C, FORTH, COBOL, BASIC, DCL, csh, bash, ksh, sh, Electronics, Microcontrollers, Disability Engineering, Netrek, Bicycles, Pedant, Farming, Home Control, Remote Area Power, Greek Scholar, Tenor Vocalist, Church Sound, Husband. "Specialisation is for insects." -- Robert Heinlein.

Check out Dallas Semiconductor. You may be able to use a modified version of their Micro-Lan protocol. This is a link to an ap note in pdf format http://www.dalsemi.com/DocControl/PDFs/app108.pdf Fernando Santos wrote: {Quote hidden}> Hello all, > > I need know the best way to communicate with one pin between more than 5 > > Pic's > "like a little network" in a very noise environment. > Or must I make that in RS485 ? > > How is the princip of the one pin communication with one Master and many > > Slaves ? > > Thank You > > mop18932KILLspammail.telepac.pt

Hi, can you tell us a reliable specification source for the Dallas 1-wire (TM) protocol. I'm fascinated by it... Imre On Mon, 4 Jan 1999, James Cameron wrote: {Quote hidden}> Fernando Santos wrote: > > I need know the best way to communicate with one pin between more > > than 5 Pic's [...] > > I don't know about the best way, but having just figured out the Dallas > one-wire protocol, I'd probably see if I could use that. > > -- > James Cameron (.....cameronKILLspam.....stl.dec.com) > > OpenVMS, Linux, Firewalls, Software Engineering, CGI, HTTP, X, C, FORTH, > COBOL, BASIC, DCL, csh, bash, ksh, sh, Electronics, Microcontrollers, > Disability Engineering, Netrek, Bicycles, Pedant, Farming, Home Control, > Remote Area Power, Greek Scholar, Tenor Vocalist, Church Sound, Husband. > > "Specialisation is for insects." -- Robert Heinlein. > >

On 4 Jan 99, 10:51 Roger Morella wrote: > Check out Dallas Semiconductor. You may be able to use a modified version > of their Micro-Lan protocol. This is a link to an ap note in pdf format > http://www.dalsemi.com/DocControl/PDFs/app108.pdf Hm. There is a much more interesting application note 106 mentioned in the ds2437 documentation, but I couldn't find it in the application note index. Does anybody out there have an idea why it is missing? I asked their web master, but haven't got an answer, yet. -- o ( EraseMEWolfgang.Stroblspam_OUTTakeThisOuTgmd.de (+49 2241) 14-2394 /\ * GMD mbH #include _`\ `_<=== Schloss Birlinghoven, <std.disclaimer> __(_)/_(_)___.-._ 53754 Sankt Augustin, Germany ________________

On 4 Jan 99, 11:33 Dr. Imre Bartfai wrote: > can you tell us a reliable specification source for the Dallas 1-wire (TM) > protocol. I'm fascinated by it... I believe most of their data sheets provide enough information to implement it. I just wrote small test program which interfaces with a handfull of 1820 sensors (using bare CCS C, with no assembly interspersed), using just that info, and the program worked the first time I tried it out. There are two questions, though. a) is there anything proprietary about that protocol, besides the trademark? While it might be easy to come up with a nonproprietary version, one would prefer to follow their specs to the bit, if only for being able to mix different devices on the same "1- wire". b) if there is a satisfactory answer to a) - what about the so called "family code"? It would certainly be nice to know which family codes NOT to use. -- o ( Wolfgang.Stroblspam_OUTgmd.de (+49 2241) 14-2394 /\ * GMD mbH #include _`\ `_<=== Schloss Birlinghoven, <std.disclaimer> __(_)/_(_)___.-._ 53754 Sankt Augustin, Germany ________________

At 11:33 04/01/99 +0100, you wrote: >can you tell us a reliable specification source for the Dallas 1-wire (TM) >protocol. I'm fascinated by it... It's called microLAN, details are at http:\\http://www.ibutton.com (or via http://www.dalsemi.com)- they have lots of pdf files! ibuttons are the little metal cases that some of the 1-wire devices are supplied in. Nigel

At 11:33 04/01/99 +0100, you wrote: >can you tell us a reliable specification source for the Dallas 1-wire (TM) >protocol. I'm fascinated by it... Go at http://www.dalsemi.com for PDF file on 1-Wire device and try UMPS example on DS1821 and PIC16C84: 1-wire protocol and CRC source are in the example. Regards, Philippe. +--------------------------------------------------------+ | Virtual Micro Design | | Technopole Izarbel, | | 64210 BIDART | | FRANCE | | | | Phone: ++33 559.438.458 Fax: ++33 559.438.401 | | | | E-Mail: @spam@p.techerKILLspamvmdesign.com | | URL: http://www.vmdesign.com | +--------------------------------------------------------+

Wolfgang, I have it on the Dallas CD-ROM. It title is 'Complex Microlans'and it is 117 Kilobytes in the Acrobat PDF format. I'll post it on to you or anyone that mails me privately. Regards, Gerry Cox Weymouth, Dorset, U.K. -----Original Message----- From: Wolfgang Strobl [KILLspamwsKILLspamGMD.DE] Sent: 05 January 1999 11:46 To: RemoveMEPICLISTTakeThisOuTMITVMA.MIT.EDU Subject: Re: one pin communication Hm. There is a much more interesting application note 106 mentioned in the ds2437 documentation, but I couldn't find it in the application note index. Does anybody out there have an idea why it is missing? I asked their web master, but haven't got an answer, yet.

Check out Dallas Semiconductor. You may be able to use a modified version of their Micro-Lan protocol. This is a link to an ap note in pdf format. There are others on their web site that also contain information about Micro-Lan. http://www.dalsemi.com/DocControl/PDFs/app108.pdf Roger Fernando Santos wrote: {Quote hidden}> Hello all, > > I need know the best way to communicate with one pin between more than 5 > > Pic's > "like a little network" in a very noise environment. > Or must I make that in RS485 ? > > How is the princip of the one pin communication with one Master and many > > Slaves ? > > Thank You > > spamBeGonemop18932spamBeGonemail.telepac.pt

Check out the ibutton protocol created by dallas. It supports many devices on the 'bus' (which is one line). Also called the 1-wire protocol. Basically it defines valid data times for the master & slaves. {Quote hidden}> > Hello all, > > I need know the best way to communicate with one pin between more than 5 > > Pic's > "like a little network" in a very noise environment. > Or must I make that in RS485 ? > > How is the princip of the one pin communication with one Master and many > > Slaves ? > > Thank You > > TakeThisOuTmop18932EraseMEspam_OUTmail.telepac.pt > Jonathan RemoveMEjclineTakeThisOuTee.calpoly.edu