Olin Lathrop wrote:
> Robert B. wrote:
>> The ibuttons aren't wireless (afaik), and don't do any sort of
>> computations on their own.  Really I think they're more like a 1-wire
>> interface to a cheap durable and portable kbit of nonvolatile ram.
>
> Yes, of course they are.

Actually, they aren't.  Some of them have processors inside, running java.
It might be worth looking at the range available.

As well as ID (and other applications- I use them for home temperature
monitoring), they are used for monetary applications which require a much
higher degree of security than 'is this the correct serial number', or
'does this RAM contain the correct data', both of which can be easily
cloned.

Nigel

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