According to Nathan Schmidt:
>
> Hello all,
>
> Has anyone looked into using the iButton cans (www.ibutton.com) from Dallas
> Semi? They use a 1-wire interface which probably would work with a PIC,

yes tho not from a PIC.  We use the buttons for tracking people in radiation
work areas (a requirement of NRC).  People touch into and out of work areas.
the buttons are read by a videx reader which stores the info until a pen-top
harvests the data-- works great & was much cheaper that other alternatives
we looked at.

You and also read them from a PC serial port so a PIC shouldn't be much of a
trick.

> though there may be some issues dealing with the 115kbit/sec transfer rate.
> These things seem like a great application of the PIC, which could provide
> a gateway to real-world elements using the DS1990 as an authentication
> tool. Am I totally wrong here? Sorry, I've been lurking in this group for a
> while, and haven't made the leap from Stamps to PICs, so I'm not really
> familiar with the throughput possible with an entry-level PIC.
>
> Thanks,
>  Nathan
>


--
Les Troyer
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