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

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