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'iBUTTONS from Dallas Semi.'
1998\09\10@193059 by Steven Kosmerchock

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Friends,
Has anybody ever tried to interface a PIC to one of these little guys? Has anybo
dy out there tried developing software/hardware for iBUTTONS at all? I'm see man
y possibilities and would love to get a point of knowing how to design with thes
e. Any suggestions would be helpful.

                       Best regards,
                       Steven


Steven Kosmerchock
Email: spam_OUTsteve.kosmerchockTakeThisOuTspamcelwave.com
http://www.geocities.com/researchtriangle/lab/6584

1998\09\11@014908 by aureo

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What is an iBUTTON ?

Steven Kosmerchock wrote:
>
> Friends,
> Has anybody ever tried to interface a PIC to one of these little guys? Has any
body out there tried developing software/hardware for iBUTTONS at all? I'm see m
any possibilities and would love to get a point of knowing how to design with th
ese. Any suggestions would be helpful.
>
>                         Best regards,
>                         Steven
>
> Steven Kosmerchock
> Email: .....steve.kosmerchockKILLspamspam@spam@celwave.com
> http://www.geocities.com/researchtriangle/lab/6584

1998\09\11@034841 by Ake Hedman, eurosource

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You have some code at http://www.brattberg.se in the esc section. This is
just plain 1-wire communication except for programming.

Regards
/Ake

======================================================================
Ake Hedman - Soft.Dev.Eng.
Eurosource, Gruvbyn 415A, S-820 50 LOOS, SWEDEN
Phone: +46 657 413422      Fax: +46 657 10612
WEB: http://www.eurosource.se

Carpe diem quam minimum credula postero
======================================================================
> {Original Message removed}

1998\09\11@054119 by - Underwater Acoustics Group

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At 09:35 11/09/98 +0200, you wrote:
>You have some code at http://www.brattberg.se in the esc section. This is
>just plain 1-wire communication except for programming.

Where?  I had a look but couldn't see an "esc" section or anything else
mentioning ibuttons or PICs

As you said though, it's fairly straightforward programming- all the specs
are downloadable from http://www.ibutton.com- there's some very nifty parts
in the range- the 1-wire battery charge monitor looks like it could have
several more applications, for example...

Nigel
--
Nigel Orr                  Research Associate   O   ______
       Underwater Acoustics Group,              o / o    \_/(
Dept of Electrical and Electronic Engineering     (_   <   _ (
    University of Newcastle Upon Tyne             \______/ \(

1998\09\11@073047 by Ake Hedman, eurosource

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part 0 1634 bytes content-type:application/octet-stream;The code is in the file http://zeus.brattberg.se/Esc/mlrs232.zip

The 1-wire code is written by Pavel Korensky <pavelkspamKILLspamdator3.anet.cz> with a
few small additions, changes from my side.


Regards
/Ake

> {Original Message removed}

1998\09\11@101308 by Ross Hartman

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Steven;

I have a project coming up that uses the Dallas One Wire (DOW) protocol. In orde
r to be legal in all respects what I finally decided to do was to use a chip (I
think its DS2404S-CO1) which provides a 3 wire (@2Mbs) interface to the PIC. Thi
s chip then talks to the microLAN
(DOW). There is also a clock and some RAM in this chip (which may or maynot be u
seful <g>). I believe all the iButton stuff is based on this protocol but I am j
ust using the various temperature sensors and switches that are available with t
he same protocol but are not
necessarily iButton products, with this interface chip. I also purchased the TME
X SDK. I originally tried to decipher product data sheets info so I could write
my own management system (on a master, PC in this case, I should add all my PICs
are slaves to this master PC) but
finally concluded that it was not a trivial task. The SDK then saves a ton of ti
me.

I think that it is important to note that I finally came to understand that the
iButton stuff has alot of security built into it . As an over simplified example
, one of the iButton applications is entry locks where the iButton holds a seria
l number (or whatever) that the TMEX
sensors retrieve from the iButton and then passes this info on to the master of
the DOW (micro LAN) for switching a mechanism to open the door.

Trying to circumvent all this security stuff can be a PIA, not to mention legall
y precarious.

What I did originally was to get a MicroLAN evaluation kit from Dallas (about $5
0US) and this got me up to speed on the iButtons and the microLAN and so on.

I suggest you check their website  dalsemi.com (also ibutton.com for the iButton
home page)

Hope this helps...

L8R/Ross

Steven Kosmerchock wrote:

> Friends,
> Has anybody ever tried to interface a PIC to one of these little guys? Has any
body out there tried developing software/hardware for iBUTTONS at all? I'm see m
any possibilities and would love to get a point of knowing how to design with th
ese. Any suggestions would be helpful.
>
>                         Best regards,
>                         Steven
>
> Steven Kosmerchock
> Email: .....steve.kosmerchockKILLspamspam.....celwave.com
> http://www.geocities.com/researchtriangle/lab/6584

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