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???
03/04/06 01:33
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 		 #111218 - The Passive stuff is short range
Responding to: ???'s previous message
It gets power from the RF field of the reader.
The range is short inches to a few feet at most.
All the 10 cent ones do is send back preprogrammed number.

Mobil Gasoline also uses them. Passive RFiD for the key chains, and active for the windsheild ones.

List of 34 messages in thread
TopicAuthorDate
CHEAP, SIMPLE local RF link?            01/01/70 00:00      
   Details?            01/01/70 00:00      
      more detail            01/01/70 00:00      
         go for optical            01/01/70 00:00      
            really            01/01/70 00:00      
               that might be appealing ... IF ...            01/01/70 00:00      
                  there is a design            01/01/70 00:00      
                     that's probably too big ...            01/01/70 00:00      
            Optical doesn't look promising ...            01/01/70 00:00      
               neither RFID            01/01/70 00:00      
                  What???            01/01/70 00:00      
                     sure, but            01/01/70 00:00      
                        It seems so ... I wondered about that ..            01/01/70 00:00      
         Zig-Bee            01/01/70 00:00      
            I've got no idea ...            01/01/70 00:00      
               The Passive stuff is short range            01/01/70 00:00      
                  too bad            01/01/70 00:00      
                     RFID and RF transpoders            01/01/70 00:00      
                        a mite costly, but ...            01/01/70 00:00      
                           Integration            01/01/70 00:00      
                              uC in reader only, not the tag            01/01/70 00:00      
                                 I'm going to have an MCU for sure            01/01/70 00:00      
   try            01/01/70 00:00      
   thanks for the links ...            01/01/70 00:00      
   How about Micrel?            01/01/70 00:00      
      I'll have a look            01/01/70 00:00      
      isn't there a 'nordic"?            01/01/70 00:00      
         interesting variant            01/01/70 00:00      
            sometimes, Richard, you have to do the w            01/01/70 00:00      
               It's a good possibility ...            01/01/70 00:00      
                  Nordic            01/01/70 00:00      
   for some reason            01/01/70 00:00      
      Chipcon modules            01/01/70 00:00      
         That looks like the right sort of thing            01/01/70 00:00      

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