Re: iButton & Things

["Campbell" <campbell@xxxxxxx>]

Nigel,
Thanks for posting the gen on ibutton I received the cd, no data book, but
I
believe it's all on the cd. No just to work how much and waht to spend on.


Thanks
Campbell
----- Original Message -----
From: "Nigel Orr" <Nigel.Orr@xxxxxxx>
To: <ukha_d@xxxxxxx>
Sent: Thursday, May 25, 2000 3:05 PM
Subject: Re: [ukha_d] iButton & Things


> At 14:39 25/05/00 +0100, you wrote:
> >connector so that I can monitor temp on a real-time basis. What do
I have
to
> >do? Do I get some wire and solder the iButtons to it ?? How do I
do that.
>
> There are 2 related technologies.  iButton describes the physical
> configuration of the 'litium-battery' sized devices.  They have 2
contacts,
> and you connect to them with either an ibutton reader/socket or some
other
> contact of your design.
> 1-wire is the actual communications technology (for some reason I
thought
> it was MicroLAN, they use that occasionally too...), you can get
1-wire
> devices that look like transistors, ones that look like surface mount
> chips, and ones that look like ibuttons.
>
> You can put any physical type of 1-wire device on the same pair of
wires
as
> any other 1-wire device.  The devices can be permanently connected
(which
> is probably what you want for temperature measurement) or temporary
> connections with an ibutton reader or some other plug-and-socket
system
> (which you might want if you were using ibuttons for access control).
>
> There are defined ways that a newly connected 1-wire device can use to
let
> the network controller know that it has been connected, and defined
ways
> for the controller to interrogate devices on the network to find out
who
> they are and what they are doing there.
>
>  >before I invest in any more iButton but it seems very hard to
find any
BASIC
>  > info on the web regarding iButton.
>
> http://www.ibutton.com/ibuttons/index.html
is probably the best
> introduction to ibuttons, and http://www.ibutton.com/csp.html
says a
little
> about the other 1-wire devices that are available (and they've still
got
> the free sample offer on, for the tiny devices!)
>
> After that, it seems the best thing to get is the Dallas Semi data
book
and
> CD-ROM, which they'll probably send you for free if you ask nicely (or
you
> might be able to buy it from RS/Farnell/Maplin).  For some reason,
they
> don't mention much about the 'bare' 1-wire devices on www.ibutton.com,
and
> there's not much about them on the www.dalsemi.com site
> either.  http://www.dalsemi.com/DocControl/PDFs/pdfindex.html
and search
on
> the page for '1-Wire' should give you an idea of the products
available,
> and you can link to their data sheets (just noticed the A/D converter-
very
> nice!)
>
> And, as ibuttons occupy a place in my to-do list, I can't give you
much
> more help than that...
>
> Nigel
>
>
>
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