> Harold Hallikainen wrote:
>
>> RFID is pretty neat. I designed a cow thermometer (for veterinarians)
>> that
>> logs the cow ID (read from an RFID tag), the cow's temperature, the date
>> and time. Thousands of readings can then be downloaded later for
>> analysis
>> and archive. Prior to this, the typical logging system consisted of
>> writing the date and temperature in chalk on the side of the cow...
>
> Is there a low-quantity way (low production numbers) to use an RFID to
> read
> the state of a switch, i.e. no battery at the "sender" at the switch?
> Range
> would have to be something like a meter, reliability rather good.
>
> Gerhard


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.

Harold

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