> Harold Hallikainen <harold <at> hallikainen.org> writes:
>
>> > Harold Hallikainen wrote:
>
>> I haven't looked for anything like that, but it seems possible a
>> standard
>> passive RFID could handle that. Whether such a tag exists, though, I
>> dunno! In my application, I just had to read the insternational standard
>> cow number (something like 10 digits) from the tag.
>
> How come 10 digits are enough to tag all the cows in the civilized world ?
> That
> would be far fewer than 10 billion (10^10 - is it base 10 ?) cows. I
> thought
> they outnumbered humans. They should also rotate somehow, as their
> lifespans are
> not that long (one could say, by design).
>


You're right! I haven't looked at that code in a while. The ID is 22
characters long. Some of it is a country code and various other
identifiers. I'm storing 22 characters, though.

Harold



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