Take a look at Circuit Cellar #140, March of 2002.  There's an article
about making a PIC-based iButton Reader in there.  At the very least,
it'll give you a good starting place.

Mike H.

>Has anyone done any data logging with a PIC and an iButton? I'm thinking
>the
>DS1994 with internal battery backed 4kbit ram and RTC would be great for
>this application.
>
>Anybody have any thoughts or experiences with this?
>
>Denny
>
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